RHSA-2026:80167
Vulnerability from csaf_redhat - Published: 2026-10-15 02:02 - Updated: 2026-10-20 21:00Summary
Red Hat Security Advisory: Red Hat build of MicroShift 4.18.57 security update
Severity
Important
Notes
Topic: Red Hat build of MicroShift release 4.18.57 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
4.18.57. Read the following advisory for the container images for this
release:
https://access.redhat.com/errata/RHSA-2026:79039
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)
* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive
recursion in Unmarshal (CVE-2026-33818)
* mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME
header (CVE-2026-42504)
* html/template: golang: Go html/template: Cross-Site Scripting via
pathological input (CVE-2026-56858)
* net/url: golang: golang net/url: Denial of Service from quadratic
complexity in path resolution (CVE-2026-56860)
* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite
KeyUpdate messages (CVE-2026-56862)
All Red Hat build of MicroShift 4.18 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.
7.5 (High)
Affected products
Fixed
18 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-gateway-api-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-gateway-api-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-gateway-api-release-info-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-greenboot-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-low-latency-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-multus-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-multus-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-multus-release-info-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-networking-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-networking-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-olm-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-olm-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-olm-release-info-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-release-info-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHOSE-4.18:microshift-selinux-0:4.18.57-202610092321.p0.g94a47d0.assembly.4.18.57.el9.noarch | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
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)
Affected products
Fixed
18 products, the same list as for
CVE-2026-33814
Threats
Impact
Important
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)
Affected products
Fixed
18 products, the same list as for
CVE-2026-33814
Threats
Impact
Important
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)
Affected products
Fixed
18 products, the same list as for
CVE-2026-33814
Threats
Impact
Important
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)
Affected products
Fixed
18 products, the same list as for
CVE-2026-33814
Threats
Impact
Important
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)
Affected products
Fixed
18 products, the same list as for
CVE-2026-33814
Threats
Impact
Important
References
55 references
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{
"category": "description",
"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"
},
{
"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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"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"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"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-2026-33818",
"cwe": {
"id": "CWE-776",
"name": "Improper Restriction of Recursive Entity References in DTDs (\u0027XML Entity Expansion\u0027)"
},
"discovery_date": "2026-08-13T22:12:37.151735+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2515815"
}
],
"notes": [
{
"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service flaw in the Go encoding/asn1 package, as it can be triggered remotely without authentication. An attacker can provide a malformed ASN.1 structure, causing excessive recursion during unmarshalling and leading to stack exhaustion, which can render the service unavailable.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-33818"
},
{
"category": "external",
"summary": "RHBZ#2515815",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515815"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-33818",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33818"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33818",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33818"
},
{
"category": "external",
"summary": "https://go.dev/cl/814980",
"url": "https://go.dev/cl/814980"
},
{
"category": "external",
"summary": "https://go.dev/issue/80405",
"url": "https://go.dev/issue/80405"
},
{
"category": "external",
"summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
"url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-5972",
"url": "https://pkg.go.dev/vuln/GO-2026-5972"
}
],
"release_date": "2026-08-13T21:58:52.821000+00:00",
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{
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
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"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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"details": "Important"
}
],
"title": "encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal"
},
{
"cve": "CVE-2026-42504",
"cwe": {
"id": "CWE-1050",
"name": "Excessive Platform Resource Consumption within a Loop"
},
"discovery_date": "2026-06-02T23:01:00.320527+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2484204"
}
],
"notes": [
{
"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is rated as an Important severity flaw. A remote attacker could trigger a Denial of Service by sending a crafted MIME header with numerous invalid encoded-words to an application utilizing the affected Golang MIME package. This could lead to excessive CPU consumption on the system processing the malformed header, impacting service availability.",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-42504"
},
{
"category": "external",
"summary": "RHBZ#2484204",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484204"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-42504",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42504"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42504",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42504"
},
{
"category": "external",
"summary": "https://go.dev/cl/774481",
"url": "https://go.dev/cl/774481"
},
{
"category": "external",
"summary": "https://go.dev/issue/79217",
"url": "https://go.dev/issue/79217"
},
{
"category": "external",
"summary": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw",
"url": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-5038",
"url": "https://pkg.go.dev/vuln/GO-2026-5038"
}
],
"release_date": "2026-06-02T22:01:37.219000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-15T02:02:45+00:00",
"details": "For MicroShift 4.18, 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/4.18/html/red_hat_build_of_microshift_release_notes/index",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:80167"
},
{
"category": "workaround",
"details": "To mitigate this issue, restrict network access to services that process MIME headers from untrusted sources. Implement input validation and sanitization for all incoming data, especially MIME headers, to prevent maliciously crafted content from being processed by applications utilizing the vulnerable Golang MIME package.",
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"availabilityImpact": "HIGH",
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"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": "mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header"
},
{
"cve": "CVE-2026-56858",
"cwe": {
"id": "CWE-79",
"name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
},
"discovery_date": "2026-08-13T22:16:32.034590+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2515838"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the `html/template` component of Go (golang). Pathological inputs could prematurely close an unescaped forward slash (\u0027/\u0027), allowing an attacker to inject arbitrary content. This could lead to Cross-Site Scripting (XSS), where malicious scripts are executed in a user\u0027s browser, potentially compromising user data or actions.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "html/template: golang: Go html/template: Cross-Site Scripting via pathological input",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important cross-site scripting (XSS) vulnerability in the Go `html/template` package. Applications utilizing this package to render untrusted input are susceptible to arbitrary content injection due to a flaw in how pathological inputs are handled, potentially leading to client-side script execution.",
"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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{
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-56858"
},
{
"category": "external",
"summary": "RHBZ#2515838",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515838"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-56858",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-56858"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56858",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56858"
},
{
"category": "external",
"summary": "https://go.dev/cl/807100",
"url": "https://go.dev/cl/807100"
},
{
"category": "external",
"summary": "https://go.dev/issue/80435",
"url": "https://go.dev/issue/80435"
},
{
"category": "external",
"summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
"url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-6091",
"url": "https://pkg.go.dev/vuln/GO-2026-6091"
}
],
"release_date": "2026-08-13T21:58:53.354000+00:00",
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{
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{
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
},
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{
"category": "impact",
"details": "Important"
}
],
"title": "html/template: golang: Go html/template: Cross-Site Scripting via pathological input"
},
{
"cve": "CVE-2026-56860",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2026-08-13T22:13:18.319384+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2515820"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in `net/url`, a component of `golang`. This vulnerability arises when resolving relative paths that contain numerous parent directory (\u0027..\u0027) 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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important denial of service flaw in the Go `net/url` package. Applications built with Go that process untrusted URLs containing parent directory segments (\u0027..\u0027) may be vulnerable to excessive resource consumption due to quadratic time complexity in path resolution. This can lead to a denial of service, impacting the availability of affected services.",
"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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{
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},
{
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{
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"summary": "https://go.dev/issue/80494",
"url": "https://go.dev/issue/80494"
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{
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},
{
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"summary": "https://pkg.go.dev/vuln/GO-2026-6218",
"url": "https://pkg.go.dev/vuln/GO-2026-6218"
}
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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:80167"
}
],
"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"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution"
},
{
"cve": "CVE-2026-56862",
"cwe": {
"id": "CWE-1050",
"name": "Excessive Platform Resource Consumption within a Loop"
},
"discovery_date": "2026-08-13T22:16:41.928450+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2515839"
}
],
"notes": [
{
"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages",
"title": "Vulnerability summary"
},
{
"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"
},
{
"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": {
"fixed": [
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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-56862"
},
{
"category": "external",
"summary": "RHBZ#2515839",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515839"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-56862",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-56862"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862"
},
{
"category": "external",
"summary": "https://go.dev/cl/804261",
"url": "https://go.dev/cl/804261"
},
{
"category": "external",
"summary": "https://go.dev/issue/80528",
"url": "https://go.dev/issue/80528"
},
{
"category": "external",
"summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
"url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-6090",
"url": "https://pkg.go.dev/vuln/GO-2026-6090"
}
],
"release_date": "2026-08-13T21:58:53.216000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-15T02:02:45+00:00",
"details": "For MicroShift 4.18, 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/4.18/html/red_hat_build_of_microshift_release_notes/index",
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}
],
"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"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages"
}
]
}
Loading…
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.