Vulnerability · Published Mar 30, 2026 · Assigned by GitHub_M
CVE-2026-32883Botan: Missing OCSP Response Signature Verification Allows MitM Certificate Revocation Bypass
Medium 5.9
In plain English
A medium-severity security flaw in botan from randombit. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.2%top 94.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Botan is a C++ cryptography library. From version 3.0.0 to before version 3.11.0, during X509 path validation, OCSP responses were checked for an appropriate status code, but critically omitted verifying the signature of the OCSP response itself. This issue has been patched in version 3.11.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | botan3 | 3.11.0-r0 | ALPINE-CVE-2026-32883 |
| Debian:13 | botan3 | 3.11.0+dfsg-2 | DEBIAN-CVE-2026-32883 |
| Debian:14 | botan3 | 3.11.0+dfsg-2 | DEBIAN-CVE-2026-32883 |
| Ubuntu:25.10 | botan | no fix listed | UBUNTU-CVE-2026-32883 |
| Ubuntu:25.10 | botan3 | no fix listed | UBUNTU-CVE-2026-32883 |
| Ubuntu:26.04:LTS | botan3 | no fix listed | UBUNTU-CVE-2026-32883 |
| Ubuntu:26.10 | botan3 | no fix listed | UBUNTU-CVE-2026-32883 |
Affected products (as reported)
Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
References
- https://github.com/randombit/botan/security/advisories/GHSA-9j2j-hqmc-hf5x x_refsource_CONFIRM