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Back to active CVEs
Low · CVSS 2.1CVE-2026-48057

Botan: directoryName nameConstraint bypass via multi-AVA RDN flattening in matches_dnCVE-2026-48057

Answer in brief

CVE-2026-48057 records a Low severity (CVSS 2.1) vulnerability in Botan: directoryName nameConstraint bypass via multi-AVA RDN flattening in matches_dn. The current sources do not mark it as known exploited. The current feed maps randombit/botan (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 6, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 2.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 2.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps randombit/botan (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
randombit/botangeneric<3.13.03.13.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for randombit/botan.
  2. 2Review the reported fix. Update randombit/botan to 3.13.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Botan is a C++ cryptography library. Prior to 3.13.0, Botan's X.509 Distinguished Name decoder flattens the Attribute-Value Assertions in each Relative Distinguished Name and loses multi-value RDN grouping before DN name-constraint enforcement. An attacker controlling a name-constrained intermediate CA can issue a certificate with a multi-value RDN whose first Common Name matches the permitted constraint and whose second Common Name is attacker-chosen, causing the constraint check to accept the flattened first value. If the certificate contains no subjectAlternativeName extension, the second Common Name can then be accepted as a hostname; Botan does not fall back to Common Name hostname matching when any subjectAlternativeName is present. The exposure is limited to deployments using DN name constraints, which are uncommon outside internal PKIs, and to certificates without a subjectAlternativeName. This issue is fixed in version 3.13.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Botan: scrypt V-buffer heap overflow on 32-bit from constructor-accepted parametersSame randombit/botan package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-295, CWE-1023
Source
CVE List V5
Source checked
Nov 6, 2026
References
3 linked sources
Open source record