Vulnerability · Published Oct 29, 2026 · Assigned by GitHub_M
CVE-2026-118766Botan: Online OCSP redirects enable blind requests to internal HTTP services
Medium 6.1
In plain English
A medium-severity server-side request forgery 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 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Botan is a C++ cryptography library. Prior to 3.13.0, Botan's online OCSP client allowed a single HTTP redirect while posting an OCSP request to the URI in a certificate's Authority Information Access extension. A malicious OCSP responder or an on-path attacker could redirect the client to make one blind request to an otherwise unreachable internal HTTP service. The primary impact is blind SSRF that might affect internal services with non-idempotent GET handlers, and response timing can provide a coarse internal-service oracle. This issue is fixed in version 3.13.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | botan | no fix listed | DEBIAN-CVE-2026-118766 |
| Debian:13 | botan | no fix listed | DEBIAN-CVE-2026-118766 |
| Debian:13 | botan3 | no fix listed | DEBIAN-CVE-2026-118766 |
| Debian:14 | botan3 | 3.13.0+dfsg-2 | DEBIAN-CVE-2026-118766 |
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
References
- https://github.com/randombit/botan/security/advisories/GHSA-9qgq-q9j4-4f82 x_refsource_CONFIRM
- https://github.com/randombit/botan/pull/5815 x_refsource_MISC
- https://github.com/randombit/botan/commit/9791ca39a556c76186b1fc943c7d8d460712d58f x_refsource_MISC