RHSA-2026:57126
Vulnerability from csaf_redhat - Published: 2026-08-19 19:58 - Updated: 2026-09-24 19:40Summary
Red Hat Security Advisory: yggdrasil security update
Severity
Important
Notes
Topic: An update for yggdrasil is now available for Red Hat Enterprise Linux 10.
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: yggdrasil is a system daemon that subscribes to topics on an MQTT broker and routes any data received on the topics to an appropriate child "worker" process, exchanging data with its worker processes through a D-Bus message broker.
Security Fix(es):
* crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)
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.
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.
8.8 (High)
Affected products
Fixed
33 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-0:0.4.9.2-1.el10_2.2.aarch64 | — |
Vendor Fix
fix
|
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| Unresolved product id: AppStream-10.2.Z:yggdrasil-0:0.4.9.2-1.el10_2.2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-0:0.4.9.2-1.el10_2.2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-0:0.4.9.2-1.el10_2.2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-0:0.4.9.2-1.el10_2.2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-debuginfo-0:0.4.9.2-1.el10_2.2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-debuginfo-0:0.4.9.2-1.el10_2.2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-debuginfo-0:0.4.9.2-1.el10_2.2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-debuginfo-0:0.4.9.2-1.el10_2.2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-debugsource-0:0.4.9.2-1.el10_2.2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-debugsource-0:0.4.9.2-1.el10_2.2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-debugsource-0:0.4.9.2-1.el10_2.2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-debugsource-0:0.4.9.2-1.el10_2.2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-examples-debuginfo-0:0.4.9.2-1.el10_2.2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-examples-debuginfo-0:0.4.9.2-1.el10_2.2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-examples-debuginfo-0:0.4.9.2-1.el10_2.2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: AppStream-10.2.Z:yggdrasil-examples-debuginfo-0:0.4.9.2-1.el10_2.2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-debuginfo-0:0.4.9.2-1.el10_2.2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-debuginfo-0:0.4.9.2-1.el10_2.2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-debuginfo-0:0.4.9.2-1.el10_2.2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-debuginfo-0:0.4.9.2-1.el10_2.2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-debugsource-0:0.4.9.2-1.el10_2.2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-debugsource-0:0.4.9.2-1.el10_2.2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-debugsource-0:0.4.9.2-1.el10_2.2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-debugsource-0:0.4.9.2-1.el10_2.2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-devel-0:0.4.9.2-1.el10_2.2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-devel-0:0.4.9.2-1.el10_2.2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-devel-0:0.4.9.2-1.el10_2.2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-devel-0:0.4.9.2-1.el10_2.2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-examples-debuginfo-0:0.4.9.2-1.el10_2.2.aarch64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-examples-debuginfo-0:0.4.9.2-1.el10_2.2.ppc64le | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-examples-debuginfo-0:0.4.9.2-1.el10_2.2.s390x | — |
Vendor Fix
fix
|
|
| Unresolved product id: CRB-10.2.Z:yggdrasil-examples-debuginfo-0:0.4.9.2-1.el10_2.2.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Important
References
12 references
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"name": "Improper Validation of Unsafe Equivalence in Input"
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"ids": [
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"text": "2456335"
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"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
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"text": "crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application",
"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"
},
{
"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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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-33810"
},
{
"category": "external",
"summary": "RHBZ#2456335",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456335"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-33810",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33810"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33810",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33810"
},
{
"category": "external",
"summary": "https://go.dev/cl/763763",
"url": "https://go.dev/cl/763763"
},
{
"category": "external",
"summary": "https://go.dev/issue/78332",
"url": "https://go.dev/issue/78332"
},
{
"category": "external",
"summary": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU",
"url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
},
{
"category": "external",
"summary": "https://pkg.go.dev/vuln/GO-2026-4866",
"url": "https://pkg.go.dev/vuln/GO-2026-4866"
}
],
"release_date": "2026-04-08T01:06:56.546000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-08-19T19:58:04+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
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},
"url": "https://access.redhat.com/errata/RHSA-2026:57126"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application"
}
]
}
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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.
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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.
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