CVSS 4.0
2.1 lowCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:NCVE-2026-48057
Low (2.1) in randombit botan. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.
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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.
Severity
- EPSS
- 0.2% estimated probability of exploitation activity in the next 30 days; 5th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
- OWASP Top 10
- A07:2025 Authentication Failures
- Published
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| randombit botan | < 3.13.0 |
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12 | botan | no fix listed | DEBIAN-CVE-2026-48057 |
| Debian | 13 | botan, botan3 | no fix listed | DEBIAN-CVE-2026-48057 |
| Debian | 14 | botan3 | 3.13.0+dfsg-2 | DEBIAN-CVE-2026-48057 |
| Ubuntu | 18.04:LTS, 20.04:LTS, Pro:22.04:LTS and 1 more | botan | no fix listed | UBUNTU-CVE-2026-48057 |
| Ubuntu | 26.04:LTS, 26.10 | botan3 | no fix listed | UBUNTU-CVE-2026-48057 |
| Azure Linux | 3 | botan2 | no fix listed | AZL-112826 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; Microsoft's Azure Linux vulnerability data, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu.
Attack patterns (CAPEC)
- CAPEC-459 Creating a Rogue Certification Authority Certificate Likelihood: Medium · Severity: Very High
- CAPEC-475 Signature Spoofing by Improper Validation Likelihood: Low · Severity: High
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.