RHSA-2026:57845

Vulnerability from csaf_redhat - Published: 2026-08-26 00:25 - Updated: 2026-08-27 17:57
Summary
Red Hat Security Advisory: Red Hat build of MicroShift 4.16.69 security update
Severity
Important
Notes
Topic: Red Hat build of MicroShift release 4.16.69 is now available with updates to packages and images that include a security update. 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: Red Hat build of MicroShift is Red Hat's light-weight Kubernetes orchestration solution designed for edge device deployments and is built from the edge capabilities of Red Hat OpenShift Container Platform. MicroShift is an application that is deployed on top of Red Hat Enterprise Linux devices at the edge, providing an efficient way to operate single-node clusters in these low-resource environments. This advisory contains the RPM packages for Red Hat build of MicroShift 4.16.69. Read the following advisory for the container images for this release: https://access.redhat.com/errata/RHSA-2026:56854 Security Fix(es): * net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame (CVE-2026-33814) * net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820) * golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821) * net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499) All Red Hat build of MicroShift 4.16 users are advised to use these updated packages and images when they are available in the RPM repository.
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.

A flaw was found in the HTTP/2 protocol implementation within the Go standard library (golang.org/x/net and net/http/internal/http2). A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGS_MAX_FRAME_SIZE parameter set to zero. This malicious frame causes the transport layer to enter an infinite loop of writing CONTINUATION frames, leading to resource exhaustion and a Denial of Service (DoS) condition.

CWE-606 - Unchecked Input for Loop Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.src
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-greenboot-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-selinux-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Threats
Impact Important

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.

CWE-606 - Unchecked Input for Loop Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.src
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-greenboot-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-selinux-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Threats
Impact Important

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.

CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.src
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-greenboot-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-selinux-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Threats
Impact Important

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.

CWE-1046 - Creation of Immutable Text Using String Concatenation
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.src
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-greenboot-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-multus-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-olm-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.16:microshift-selinux-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch
Vendor Fix fix
Workaround
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:57845 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2467809 external
https://bugzilla.redhat.com/show_bug.cgi?id=2467815 external
https://bugzilla.redhat.com/show_bug.cgi?id=2467820 external
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-33814 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467815 external
https://www.cve.org/CVERecord?id=CVE-2026-33814 external
https://nvd.nist.gov/vuln/detail/CVE-2026-33814 external
https://go.dev/cl/761581 external
https://go.dev/cl/761640 external
https://go.dev/issue/78476 external
https://groups.google.com/g/golang-announce/c/qcC… external
https://pkg.go.dev/vuln/GO-2026-4918 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

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        "name": "Unchecked Input for Loop Condition"
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          "text": "A flaw was found in the HTTP/2 protocol implementation within the Go standard library (golang.org/x/net and net/http/internal/http2). A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGS_MAX_FRAME_SIZE parameter set to zero. This malicious frame causes the transport layer to enter an infinite loop of writing CONTINUATION frames, leading to resource exhaustion and a Denial of Service (DoS) condition.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important denial of service flaw in the Go HTTP/2 protocol implementation allows a remote, unauthenticated attacker to exhaust system resources. By sending a specially crafted HTTP/2 SETTINGS frame with a zero-value SETTINGS_MAX_FRAME_SIZE, the vulnerable Go library enters an infinite loop, impacting the availability of services utilizing HTTP/2.",
          "title": "Statement"
        },
        {
          "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.",
          "title": "CVSS score applicability"
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-33814"
        },
        {
          "category": "external",
          "summary": "RHBZ#2467815",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467815"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-33814",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-33814"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33814",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33814"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/761581",
          "url": "https://go.dev/cl/761581"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/761640",
          "url": "https://go.dev/cl/761640"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/78476",
          "url": "https://go.dev/issue/78476"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M",
          "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-4918",
          "url": "https://pkg.go.dev/vuln/GO-2026-4918"
        }
      ],
      "release_date": "2026-05-07T19:41:17.631000+00:00",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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      "title": "net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame"
    },
    {
      "cve": "CVE-2026-39820",
      "cwe": {
        "id": "CWE-606",
        "name": "Unchecked Input for Loop Condition"
      },
      "discovery_date": "2026-05-07T20:01:27.800929+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2467820"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "net/mail: golang: Go net/mail: Denial of Service via crafted email inputs",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service vulnerability in the Go `net/mail` package. Applications processing untrusted email inputs via `ParseAddress`, `ParseAddressList`, or `ParseDate` functions are susceptible to excessive resource consumption, which can lead to service unavailability.",
          "title": "Statement"
        },
        {
          "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.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39820"
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          "url": "https://go.dev/issue/78566"
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          "summary": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M",
          "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
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          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-4986",
          "url": "https://pkg.go.dev/vuln/GO-2026-4986"
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "net/mail: golang: Go net/mail: Denial of Service via crafted email inputs"
    },
    {
      "cve": "CVE-2026-39821",
      "cwe": {
        "id": "CWE-1289",
        "name": "Improper Validation of Unsafe Equivalence in Input"
      },
      "discovery_date": "2026-05-22T16:00:52.844126+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2480756"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "golang.org/x/net/idna is vulnerable to privilege escalation through incorrect Punycode label handling in ToASCII and ToUnicode. An attacker who can supply a Punycode hostname that passes an ASCII-only authorization check may have it normalized to a restricted ASCII name the application intended to block. Red Hat exposure is broad across products shipping the Go toolchain or bundling golang.org/x/net, including RHEL and RHEL-AI golang RPMs, hummingbird Go runtimes, OpenShift and ODF container builds, and Ceph/OpenShift components compiled against affected x/net versions.",
          "title": "Statement"
        },
        {
          "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.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-39821"
        },
        {
          "category": "external",
          "summary": "RHBZ#2480756",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480756"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-39821",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-39821"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-39821",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39821"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/767220",
          "url": "https://go.dev/cl/767220"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/78760",
          "url": "https://go.dev/issue/78760"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8",
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-5026",
          "url": "https://pkg.go.dev/vuln/GO-2026-5026"
        }
      ],
      "release_date": "2026-05-22T15:01:21.462000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-26T00:25:32+00:00",
          "details": "For MicroShift 4.16, read the following documentation for important\ninstructions on how to install the latest RPMs and fully apply this\nasynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/red_hat_build_of_microshift/4.16/html/red_hat_build_of_microshift_release_notes/index",
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            "9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64",
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            "9Base-RHOSE-4.16:microshift-olm-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch",
            "9Base-RHOSE-4.16:microshift-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:57845"
        },
        {
          "category": "workaround",
          "details": "Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds.",
          "product_ids": [
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
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      "threats": [
        {
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          "details": "Important"
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      ],
      "title": "golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing"
    },
    {
      "cve": "CVE-2026-42499",
      "cwe": {
        "id": "CWE-1046",
        "name": "Creation of Immutable Text Using String Concatenation"
      },
      "discovery_date": "2026-05-07T20:00:51.685602+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2467809"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "net/mail: golang: net/mail: Denial of Service via pathological email address parsing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service vulnerability in the `net/mail` package of the Go standard library. A remote attacker can exploit this flaw by sending specially crafted email addresses, leading to excessive resource consumption and a denial of service in Go applications that parse email addresses using the affected library.",
          "title": "Statement"
        },
        {
          "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.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42499"
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        {
          "category": "external",
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        },
        {
          "category": "external",
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42499"
        },
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42499",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42499"
        },
        {
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          "summary": "https://go.dev/cl/771520",
          "url": "https://go.dev/cl/771520"
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          "summary": "https://go.dev/issue/78987",
          "url": "https://go.dev/issue/78987"
        },
        {
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          "summary": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M",
          "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-4977",
          "url": "https://pkg.go.dev/vuln/GO-2026-4977"
        }
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          "date": "2026-08-26T00:25:32+00:00",
          "details": "For MicroShift 4.16, read the following documentation for important\ninstructions on how to install the latest RPMs and fully apply this\nasynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/red_hat_build_of_microshift/4.16/html/red_hat_build_of_microshift_release_notes/index",
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            "9Base-RHOSE-4.16:microshift-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch",
            "9Base-RHOSE-4.16:microshift-selinux-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:57845"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
          "product_ids": [
            "9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64",
            "9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.src",
            "9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64",
            "9Base-RHOSE-4.16:microshift-greenboot-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch",
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            "9Base-RHOSE-4.16:microshift-selinux-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64",
            "9Base-RHOSE-4.16:microshift-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.src",
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            "9Base-RHOSE-4.16:microshift-multus-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64",
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            "9Base-RHOSE-4.16:microshift-multus-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch",
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            "9Base-RHOSE-4.16:microshift-networking-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64",
            "9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.aarch64",
            "9Base-RHOSE-4.16:microshift-olm-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.x86_64",
            "9Base-RHOSE-4.16:microshift-olm-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch",
            "9Base-RHOSE-4.16:microshift-release-info-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch",
            "9Base-RHOSE-4.16:microshift-selinux-0:4.16.69-202608202336.p0.g763478c.assembly.4.16.69.el9.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "net/mail: golang: net/mail: Denial of Service via pathological email address parsing"
    }
  ]
}



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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.

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Detection rules are retrieved from Rulezet.

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