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RHSA-2026:65886

Vulnerability from csaf_redhat - Published: 2026-09-09 11:17 - Updated: 2026-09-12 13:33
Summary
Red Hat Security Advisory: image-builder security update
Severity
Important
Notes
Topic: An update for image-builder is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: A local binary for building customized OS artifacts such as VM images and OSTree commits. Uses osbuild under the hood. Security Fix(es): * crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281) * crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280) * net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499) * net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820) * net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811) * golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821) * mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504) * encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818) * net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860) * net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853) * html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858) * crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862) * encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-32280

A flaw was found in the Go standard library packages `crypto/x509` and `crypto/tls`. During the process of building a certificate chain, an attacker can provide a large number of intermediate certificates. This excessive input is not properly limited, leading to an uncontrolled amount of work being performed. This can result in a denial of service (DoS) condition, making the affected system or application unavailable to legitimate users.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-32281

A flaw was found in Go's `crypto/x509` package. A remote attacker could exploit this by presenting a specially crafted certificate chain containing a large number of policy mappings. This inefficient validation process consumes excessive resources, which can lead to a denial of service (DoS) for applications or systems performing certificate validation.

5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2026-33811

A flaw was found in the `net` package of Go (golang), specifically when using the `LookupCNAME` function with the `cgo` DNS resolver. A remote attacker could exploit this by providing a very long Canonical Name (CNAME) response. This can trigger a double-free of C memory, leading to a crash and a Denial of Service (DoS) for the affected application.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1341 - Multiple Releases of Same Resource or Handle
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-33818

A flaw was found in the `encoding/asn1` package in Go. An attacker could provide a specially crafted, deeply-nested Abstract Syntax Notation One (ASN.1) structure, leading to excessive recursion during the `Unmarshal` operation. This could result in stack exhaustion and a Denial of Service (DoS) condition.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-39820

A flaw was found in the `net/mail` package of the Go programming language. An attacker could provide specially crafted inputs to the `ParseAddress`, `ParseAddressList`, or `ParseDate` functions. This could lead to excessive consumption of CPU and memory resources, resulting in a Denial of Service (DoS) for applications processing these inputs.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-606 - Unchecked Input for Loop Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-39821

A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.

8.2 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-42499

A flaw was found in the `net/mail` package within the Go standard library. A remote attacker could provide specially crafted, pathological email addresses. When these malformed email addresses are parsed by the `consumePhrase` function, it can lead to excessive resource consumption due to quadratic string concatenation, resulting in a Denial of Service (DoS) condition.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1046 - Creation of Immutable Text Using String Concatenation
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-42504

A flaw was found in the Golang MIME (Multipurpose Internet Mail Extensions) package. A remote attacker could exploit this vulnerability by sending a maliciously-crafted MIME header containing many invalid encoded-words. This could lead to excessive CPU consumption, resulting in a Denial of Service (DoS) for the affected system.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-56853

A flaw was found in the `net/http` component of the Go standard library. When a server is configured to support unencrypted HTTP/2, it reads initial bytes from new connections to detect the HTTP/2 client preface. However, the `ReadHeaderTimeout` is not correctly applied during this process. This oversight could allow a remote attacker to maintain open connections indefinitely, potentially leading to a Denial of Service (DoS) by exhausting server resources.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-56858

A flaw was found in the `html/template` component of Go (golang). Pathological inputs could prematurely close an unescaped forward slash ('/'), allowing an attacker to inject arbitrary content. This could lead to Cross-Site Scripting (XSS), where malicious scripts are executed in a user's browser, potentially compromising user data or actions.

8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-56859

A flaw was found in the `encoding/xml` package of Go. The `DecodeElement` function failed to correctly track recursion depth, which could lead to stack exhaustion. A remote attacker could exploit this vulnerability by providing a specially crafted XML input, resulting in a Denial of Service (DoS) for the affected application.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-56860

A flaw was found in `net/url`, a component of `golang`. This vulnerability arises when resolving relative paths that contain numerous parent directory ('..') segments. A remote attacker could exploit this by providing a specially crafted path, leading to quadratic time complexity and excessive memory allocation. This can result in a Denial of Service (DoS) due to resource exhaustion.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-56862

A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.src —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debuginfo-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.aarch64 —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.ppc64le —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.s390x —
Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:image-builder-debugsource-0:52.1-1.el9_8.2.x86_64 —
Vendor Fix fix
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:65886 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2456333 external
https://bugzilla.redhat.com/show_bug.cgi?id=2456339 external
https://bugzilla.redhat.com/show_bug.cgi?id=2467809 external
https://bugzilla.redhat.com/show_bug.cgi?id=2467820 external
https://bugzilla.redhat.com/show_bug.cgi?id=2467822 external
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 external
https://bugzilla.redhat.com/show_bug.cgi?id=2484204 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515815 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515820 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515827 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515838 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515839 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515840 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-32280 self
https://bugzilla.redhat.com/show_bug.cgi?id=2456339 external
https://www.cve.org/CVERecord?id=CVE-2026-32280 external
https://nvd.nist.gov/vuln/detail/CVE-2026-32280 external
https://go.dev/cl/758320 external
https://go.dev/issue/78282 external
https://groups.google.com/g/golang-announce/c/0uY… external
https://pkg.go.dev/vuln/GO-2026-4947 external
https://access.redhat.com/security/cve/CVE-2026-32281 self
https://bugzilla.redhat.com/show_bug.cgi?id=2456333 external
https://www.cve.org/CVERecord?id=CVE-2026-32281 external
https://nvd.nist.gov/vuln/detail/CVE-2026-32281 external
https://go.dev/cl/758061 external
https://go.dev/issue/78281 external
https://pkg.go.dev/vuln/GO-2026-4946 external
https://access.redhat.com/security/cve/CVE-2026-33811 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467822 external
https://www.cve.org/CVERecord?id=CVE-2026-33811 external
https://nvd.nist.gov/vuln/detail/CVE-2026-33811 external
https://go.dev/cl/767860 external
https://go.dev/issue/78803 external
https://groups.google.com/g/golang-announce/c/qcC… external
https://pkg.go.dev/vuln/GO-2026-4981 external
https://access.redhat.com/security/cve/CVE-2026-33818 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515815 external
https://www.cve.org/CVERecord?id=CVE-2026-33818 external
https://nvd.nist.gov/vuln/detail/CVE-2026-33818 external
https://go.dev/cl/814980 external
https://go.dev/issue/80405 external
https://groups.google.com/g/golang-announce/c/94p… external
https://pkg.go.dev/vuln/GO-2026-5972 external
https://access.redhat.com/security/cve/CVE-2026-39820 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467820 external
https://www.cve.org/CVERecord?id=CVE-2026-39820 external
https://nvd.nist.gov/vuln/detail/CVE-2026-39820 external
https://go.dev/cl/759940 external
https://go.dev/issue/78566 external
https://pkg.go.dev/vuln/GO-2026-4986 external
https://access.redhat.com/security/cve/CVE-2026-39821 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 external
https://www.cve.org/CVERecord?id=CVE-2026-39821 external
https://nvd.nist.gov/vuln/detail/CVE-2026-39821 external
https://go.dev/cl/767220 external
https://go.dev/issue/78760 external
https://groups.google.com/g/golang-announce/c/iI-… external
https://pkg.go.dev/vuln/GO-2026-5026 external
https://access.redhat.com/security/cve/CVE-2026-42499 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467809 external
https://www.cve.org/CVERecord?id=CVE-2026-42499 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42499 external
https://go.dev/cl/771520 external
https://go.dev/issue/78987 external
https://pkg.go.dev/vuln/GO-2026-4977 external
https://access.redhat.com/security/cve/CVE-2026-42504 self
https://bugzilla.redhat.com/show_bug.cgi?id=2484204 external
https://www.cve.org/CVERecord?id=CVE-2026-42504 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42504 external
https://go.dev/cl/774481 external
https://go.dev/issue/79217 external
https://groups.google.com/g/golang-announce/c/tKs… external
https://pkg.go.dev/vuln/GO-2026-5038 external
https://access.redhat.com/security/cve/CVE-2026-56853 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515827 external
https://www.cve.org/CVERecord?id=CVE-2026-56853 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56853 external
https://go.dev/cl/795540 external
https://go.dev/issue/80205 external
https://pkg.go.dev/vuln/GO-2026-6089 external
https://access.redhat.com/security/cve/CVE-2026-56858 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515838 external
https://www.cve.org/CVERecord?id=CVE-2026-56858 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56858 external
https://go.dev/cl/807100 external
https://go.dev/issue/80435 external
https://pkg.go.dev/vuln/GO-2026-6091 external
https://access.redhat.com/security/cve/CVE-2026-56859 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515840 external
https://www.cve.org/CVERecord?id=CVE-2026-56859 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56859 external
https://go.dev/cl/803320 external
https://go.dev/issue/80481 external
https://pkg.go.dev/vuln/GO-2026-6088 external
https://access.redhat.com/security/cve/CVE-2026-56860 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515820 external
https://www.cve.org/CVERecord?id=CVE-2026-56860 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56860 external
https://go.dev/cl/803681 external
https://go.dev/issue/80494 external
https://pkg.go.dev/vuln/GO-2026-6218 external
https://access.redhat.com/security/cve/CVE-2026-56862 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515839 external
https://www.cve.org/CVERecord?id=CVE-2026-56862 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56862 external
https://go.dev/cl/804261 external
https://go.dev/issue/80528 external
https://pkg.go.dev/vuln/GO-2026-6090 external
To clipboard 

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for image-builder is now available for Red Hat Enterprise Linux 9.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "A local binary for building customized OS artifacts such as VM images and OSTree commits. Uses osbuild under the hood.\n\nSecurity Fix(es):\n\n* crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281)\n\n* crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)\n\n* net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)\n\n* net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)\n\n* net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)\n\n* golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)\n\n* mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)\n\n* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)\n\n* net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)\n\n* net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)\n\n* html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)\n\n* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)\n\n* encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:65886",
        "url": "https://access.redhat.com/errata/RHSA-2026:65886"
      },
      {
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          "text": "This is an Important denial of service vulnerability in the Go standard library\u0027s certificate chain building process. Systems utilizing Go applications that process untrusted TLS certificates or X.509 certificate chains are susceptible to resource exhaustion when presented with an excessive number of intermediate certificates, potentially leading to service unavailability. This flaw impacts applications directly using `crypto/x509` or `crypto/tls`.",
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          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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      "cve": "CVE-2026-56862",
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        "id": "CWE-1050",
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          "title": "Vulnerability description"
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          "title": "Vulnerability summary"
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          "category": "other",
          "text": "This is an Important denial of service vulnerability in the `golang` `crypto/tls` package. A remote, unauthenticated attacker can exploit this flaw by continuously sending `KeyUpdate` messages during a TLS handshake, forcing the server to perform indefinite key derivation operations. This resource exhaustion can lead to a denial of service for applications and services in Red Hat products that use the affected `crypto/tls` library and are exposed to untrusted network clients.",
          "title": "Statement"
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        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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      "title": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages"
    }
  ]
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.