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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:L

Exploitable 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 15 CVEs of Botan →
CVE-2026-118769 Botan is a C++ cryptography library 9.2 Critical CVE-2026-118768 Botan is a C++ cryptography library 5.9 Medium CVE-2026-118767 Botan is a C++ cryptography library 4.8 Medium CVE-2026-118765 Botan is a C++ cryptography library 7.3 High
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