CVE-2026-118766 Botan: Online OCSP redirects enable blind requests to internal HTTP services
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-118766?
CVE-2026-118766 is a medium-severity vulnerability in randombit botan, published on 29 Oct 2026.
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-118766?
How do I fix CVE-2026-118766?
No fix has been published for CVE-2026-118766 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-118766 being exploited?
There is no known exploitation of CVE-2026-118766 in the wild and no public exploit code.
Sources
Also known as GHSA-9qgq-q9j4-4f82.