CVE-2026-118766
Botan: Online OCSP redirects enable blind requests to internal HTTP services
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| botan randombit |
< 3.13.0 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.1 medium |
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/randombit/botan/security/advisories/GHSA-9qgq-q9j4-4f82CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/randombit/botan/pull/5815CNA: GitHub_M · x_refsource_MISC
- https://github.com/randombit/botan/commit/9791ca39a556c76186b1fc943c7d8d460712d58fCNA: GitHub_M · x_refsource_MISC
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