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CVE-2026-33810Suited to automated attack · CISA

Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509

CVSS score

7.5

EPSS probability

%0.3

Risk score

0.0

Published

6 mo ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Official patch verified

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-33810 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-33810 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1Go standard librarycrypto/x509 View
2golanggo View
Total affected vendors: 2|Products: 2

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
8.8CVSS V31HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:LNVD
8.8CVSS V3_1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:LCVE ADP
8.2CVSS V31HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:NNVD
7.5CVSS V31HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NNVD
7.5CVSS V3_1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NCVE ADP
5.9CVSS 3.x—CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NMicrosoft MSRC

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

nvd

NVD tarafından Patch olarak etiketlenmiş referans

Open source
reference

Yama veya çözüm referansı

Open source
Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Apply the official update named in the evidence only to the matching product and version.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-33810 is associated with the following CWEs:

CWE-295: Common Weakness Enumeration Entry CWE-295CWE-1289: Common Weakness Enumeration Entry CWE-1289

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-33810 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://go.dev/cl/763763vendor-advisoryhttps://go.dev/issue/78332vendor-advisoryhttps://groups.google.com/g/golang-announce/c/0uYbvbPZRWUvendor-advisoryhttps://pkg.go.dev/vuln/GO-2026-4866vendor-advisoryhttp://www.openwall.com/lists/oss-security/2026/04/19/4nvdhttp://www.openwall.com/lists/oss-security/2026/04/20/1nvdhttps://access.redhat.com/errata/RHSA-2026:10155nvdhttps://access.redhat.com/errata/RHSA-2026:10158nvdhttps://access.redhat.com/errata/RHSA-2026:13545nvdhttps://access.redhat.com/errata/RHSA-2026:14391nvd

CVSS Vector Radar Chart

7.5 / 10
Attack VectorNetworkComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityNone

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)None

Yama doğrulandı

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

GS
Go standard library logo
Go standard library
G
golang logo
golang

Weakness Type (CWE & CAPEC)

CWE-295 CWE-1289

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