CVE catalog
CVE-2026-32884
Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alterna
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.17% · Oct 27, 2026
Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alternative name is defined in the end-entity certificate Botan would check that the CN was allowed by the DNS name constraints, even though this check is technically not required by RFC 5280. However this check failed to account for the possibility of a mixed-case CN. Thus a certificate with CN=Sub.EVIL.COM and no subject alternative name would bypasses an excludedSubtrees constraint for evil.com because the comparison is case-sensitive. This issue has been patched in version 3.11.0.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | botan | trixie | 2.19.5+dfsg-4 | vulnerable |
| Debian | botan | bookworm | 2.19.3+dfsg-1+deb12u1 | vulnerable |
| Cpe | botan | Not reported | Not reported | vulnerable |
| Cpe | botan | Not reported | 3.11.0 | fixed |
| Alpine | botan3 | 3.24 | 3.11.0-r0 | fixed |
| Opensuse | Botan | leap 16.0 | 3.7.1-160000.4.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | botan | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | botan | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Cpe | botan | cpe | Not reported | 3.11.0 | Not reported | Not reported | Not reported |
| Alpine | botan3 | apk | 3.24 | 3.11.0-r0 | Not reported | ALPINE-CVE-2026-32884 | Not reported |
| Opensuse | Botan | rpm | leap 16.0 | 3.7.1-160000.4.1 | Not reported | OPENSUSE-SU-2026:20566-1 | Not reported |
Notes
[trixie] botan: Minor issue [bookworm] botan: Minor issue; case-sensitive CN fallback in DNS name-constraint check; fix only in 3.11.0
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [botan]Affected
Details (2)
2.19.3+dfsg-1+deb12u1· amd64 · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
2.19.3+dfsg-1+deb12u1· arm64 · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
- [libbotan-2-19]Affected
Source package: [botan]
Details (2)
2.19.3+dfsg-1+deb12u1· amd64 · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
2.19.3+dfsg-1+deb12u1· arm64 · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
- [libbotan-2-dev]Affected
Source package: [botan]
Details (2)
2.19.3+dfsg-1+deb12u1· amd64 · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
2.19.3+dfsg-1+deb12u1· arm64 · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
- [libbotan-2-doc]Affected
Source package: [botan]
Details (2)
2.19.3+dfsg-1+deb12u1· all · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
2.19.3+dfsg-1+deb12u1· all · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
- [python3-botan]Affected
Source package: [botan]
Details (2)
2.19.3+dfsg-1+deb12u1· amd64 · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
2.19.3+dfsg-1+deb12u1· arm64 · bookwormAffected
nvd · botan · debian · bookworm; nvd · botan · debian · 12
[Debian 13 (Trixie)]
- [botan]Affected
Source package: [botan3]
Details (4)
3.7.1+dfsg-2· amd64 · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan · debian · 13; nvd · botan3 · debian · 13
3.7.1+dfsg-2· arm64 · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan · debian · 13; nvd · botan3 · debian · 13
3.12.0+dfsg-2~deb13u1· amd64 · trixie-securityAffected · Fixed:
3.11.0+dfsg-2nvd · botan · debian · 13; nvd · botan3 · debian · 13
3.12.0+dfsg-2~deb13u1· arm64 · trixie-securityAffected · Fixed:
3.11.0+dfsg-2nvd · botan · debian · 13; nvd · botan3 · debian · 13
- [libbotan-2-19]Affected
Source package: [botan]
Details (2)
2.19.5+dfsg-4· amd64 · trixieAffected
nvd · botan · debian · 13
2.19.5+dfsg-4· arm64 · trixieAffected
nvd · botan · debian · 13
- [libbotan-2-dev]Affected
Source package: [botan]
Details (2)
2.19.5+dfsg-4· amd64 · trixieAffected
nvd · botan · debian · 13
2.19.5+dfsg-4· arm64 · trixieAffected
nvd · botan · debian · 13
- [libbotan-2-doc]Affected
Source package: [botan]
Details (2)
2.19.5+dfsg-4· all · trixieAffected
nvd · botan · debian · 13
2.19.5+dfsg-4· all · trixieAffected
nvd · botan · debian · 13
- [libbotan-3-7]Affected
Source package: [botan3]
Details (2)
3.7.1+dfsg-2· amd64 · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.7.1+dfsg-2· arm64 · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
- [libbotan-3-dev]Affected
Source package: [botan3]
Details (4)
3.7.1+dfsg-2· amd64 · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.7.1+dfsg-2· arm64 · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.12.0+dfsg-2~deb13u1· amd64 · trixie-securityFixed · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.12.0+dfsg-2~deb13u1· arm64 · trixie-securityFixed · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
- [libbotan-3-doc]Affected
Source package: [botan3]
Details (4)
3.7.1+dfsg-2· all · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.7.1+dfsg-2· all · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.12.0+dfsg-2~deb13u1· all · trixie-securityFixed · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.12.0+dfsg-2~deb13u1· all · trixie-securityFixed · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
- [python3-botan]Affected
Source package: [botan3]
Details (4)
3.7.1+dfsg-2· amd64 · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.7.1+dfsg-2· arm64 · trixieAffected · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.12.0+dfsg-2~deb13u1· amd64 · trixie-securityFixed · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.12.0+dfsg-2~deb13u1· arm64 · trixie-securityFixed · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
- [libbotan-3-12]Fixed
Source package: [botan3]
Details (2)
3.12.0+dfsg-2~deb13u1· amd64 · trixie-securityFixed · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
3.12.0+dfsg-2~deb13u1· arm64 · trixie-securityFixed · Fixed:
3.11.0+dfsg-2nvd · botan3 · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_20566-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-32884]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-32884]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-32884]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:20566-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-32884]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32884.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]