RHSA-2026:67518
Vulnerability from csaf_redhat - Published: 2026-09-15 10:11 - Updated: 2026-09-16 14:11A certificate validation flaw has been discovered in the golang crypto/x509 module. When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-23.el9_6.aarch64 | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-23.el9_6.ppc64le | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-23.el9_6.s390x | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-23.el9_6.src | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-23.el9_6.x86_64 | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debuginfo-0:10.2.6-23.el9_6.aarch64 | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debuginfo-0:10.2.6-23.el9_6.ppc64le | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debuginfo-0:10.2.6-23.el9_6.s390x | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debuginfo-0:10.2.6-23.el9_6.x86_64 | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debugsource-0:10.2.6-23.el9_6.aarch64 | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debugsource-0:10.2.6-23.el9_6.ppc64le | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debugsource-0:10.2.6-23.el9_6.s390x | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debugsource-0:10.2.6-23.el9_6.x86_64 | — |
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fix
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|
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-selinux-0:10.2.6-23.el9_6.aarch64 | — |
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fix
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-selinux-0:10.2.6-23.el9_6.ppc64le | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-selinux-0:10.2.6-23.el9_6.s390x | — |
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| Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-selinux-0:10.2.6-23.el9_6.x86_64 | — |
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A flaw in Grafana's Auth Proxy IPv6 allow-list incorrectly defaults to a broad /32 subnet mask instead of a strict /128. This misconfiguration allows remote attackers to bypass access restrictions, potentially leading to unauthorized access and data manipulation.
A flaw was found in Grafana. A user with editor privileges can overwrite a dashboard not owned by them, leading to privilege escalation on that specific dashboard. This allows the editor to gain administrative control over the affected dashboard.
A flaw was found in the `crypto/x509` package within Go (golang). When verifying a certificate chain, excluded DNS (Domain Name System) constraints are not correctly applied to wildcard DNS Subject Alternative Names (SANs) if the case of the SAN differs from the constraint. This oversight could allow an attacker to bypass certificate validation, potentially leading to the acceptance of a malicious certificate that should have been rejected. This issue specifically impacts the validation of trusted certificate chains.
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.
A flaw was found in Grafana. An unauthenticated attacker can exploit the public dashboard query endpoint by sending arbitrarily large JSON payloads. This vulnerability, caused by a lack of request body size limits, triggers excessive memory allocation, leading to a denial of service through memory exhaustion.
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.
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.
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.
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.
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.
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{
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"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important flaw in the Go `crypto/x509` package that could allow an attacker to bypass certificate validation. The vulnerability arises from an incorrect application of excluded DNS constraints to wildcard DNS Subject Alternative Names (SANs) when their case differs from the constraint. This could lead to Red Hat products accepting malicious certificates from otherwise trusted chains, compromising the trust model.",
"title": "Statement"
},
{
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"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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"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",
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"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": [
{
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"text": "2515839"
}
],
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{
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"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"
}
],
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{
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"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"
},
{
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"release_date": "2026-08-13T21:58:53.216000+00:00",
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{
"category": "vendor_fix",
"date": "2026-09-15T10:11:52+00:00",
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}
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.
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.
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.