6.1
Medium
CVE-2026-118766 Botan: Online OCSP redirects enable blind requests to internal HTTP services
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.
CVSS 3.1 detail
Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:LExploitable from the adjacent network, without an account and without any user action; the impact on data or service is limited.
- Attack vector
- Adjacent network
- Attack complexity
- Low
- Privileges required
- None
- Interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- Low
- Availability
- Low
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Botan 3.13 | earliest → < 3.13.0 | 3.13.0 |
Other CVEs of Botan
The 17 CVEs of Botan →
CVE-2026-104267
Botan: scrypt V-buffer heap overflow on 32-bit from constructor-accepted parameters
4.1
Medium
CVE-2026-48057
Botan: directoryName nameConstraint bypass via multi-AVA RDN flattening in matches_dn
2.1
Low
CVE-2026-118769
Botan is a C++ cryptography library
9.2
Critical
CVE-2026-118768
Botan is a C++ cryptography library
5.9
Medium