CVE catalog

CVE-2026-34582

Severity: Critical · CVSS 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: Apr 7, 2026, 9:13:49 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.23% · Oct 25, 2026

Botan is a C++ cryptography library. Prior to version 3.11.1, the TLS 1.3 implementation allowed ApplicationData records to be processed prior to the Finished message being received. A server which is attempting to enforce client authentication via certificates can by bypassed by a client which entirely omits Certificate, CertificateVerify, and the Finished message and instead sends application data records. This vulnerability is fixed in 3.11.1.

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`	not affected
Debian	botan	bookworm	`2.19.3+dfsg-1+deb12u1`	not affected
Cpe	botan	Not reported	Not reported	unknown
Alpine	botan3	3.24	`3.11.1-r0`	fixed
Opensuse	Botan	leap 16.0	`3.7.1-160000.3.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	botan	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	botan	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Alpine	botan3	apk	3.24	`3.11.1-r0`	Not reported	ALPINE-CVE-2026-34582	Not reported
Opensuse	Botan	rpm	leap 16.0	`3.7.1-160000.3.1`	Not reported	OPENSUSE-SU-2026:20528-1	Not reported

OpenFactory catalog packages

[Debian 13 (Trixie)]

[botan]Affected
Source package: [botan3]
Details (4)
- 3.7.1+dfsg-2 · amd64 · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.7.1+dfsg-2 · arm64 · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.12.0+dfsg-2~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.12.0+dfsg-2~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
[libbotan-3-7]Affected
Source package: [botan3]
Details (2)
- 3.7.1+dfsg-2 · amd64 · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.7.1+dfsg-2 · arm64 · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
[libbotan-3-dev]Affected
Source package: [botan3]
Details (4)
- 3.7.1+dfsg-2 · amd64 · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.7.1+dfsg-2 · arm64 · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.12.0+dfsg-2~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.12.0+dfsg-2~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
[libbotan-3-doc]Affected
Source package: [botan3]
Details (4)
- 3.7.1+dfsg-2 · all · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.7.1+dfsg-2 · all · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.12.0+dfsg-2~deb13u1 · all · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.12.0+dfsg-2~deb13u1 · all · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
[python3-botan]Affected
Source package: [botan3]
Details (4)
- 3.7.1+dfsg-2 · amd64 · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.7.1+dfsg-2 · arm64 · trixie
  Affected · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.12.0+dfsg-2~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.12.0+dfsg-2~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
[libbotan-3-12]Fixed
Source package: [botan3]
Details (2)
- 3.12.0+dfsg-2~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13
- 3.12.0+dfsg-2~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 3.11.0+dfsg-2
  nvd · botan3 · debian · 13

[Debian 12 (Bookworm)]

[botan]Not affected
Details (2)
- 2.19.3+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  nvd · botan · debian · bookworm
- 2.19.3+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  nvd · botan · debian · bookworm
[libbotan-2-19]Not affected
Source package: [botan]
Details (2)
- 2.19.3+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  nvd · botan · debian · bookworm
- 2.19.3+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  nvd · botan · debian · bookworm
[libbotan-2-dev]Not affected
Source package: [botan]
Details (2)
- 2.19.3+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  nvd · botan · debian · bookworm
- 2.19.3+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  nvd · botan · debian · bookworm
[libbotan-2-doc]Not affected
Source package: [botan]
Details (2)
- 2.19.3+dfsg-1+deb12u1 · all · bookworm
  Not affected
  nvd · botan · debian · bookworm
- 2.19.3+dfsg-1+deb12u1 · all · bookworm
  Not affected
  nvd · botan · debian · bookworm
[python3-botan]Not affected
Source package: [botan]
Details (2)
- 2.19.3+dfsg-1+deb12u1 · amd64 · bookworm
  Not affected
  nvd · botan · debian · bookworm
- 2.19.3+dfsg-1+deb12u1 · arm64 · bookworm
  Not affected
  nvd · botan · debian · bookworm

Observed: Oct 27, 2026, 7:59:37 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]