Bug 2563617 (CVE-2026-118768)

Summary: CVE-2026-118768 botan: botan: Certificate validation bypass via missing OCSP response signature verification
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in botan. The command-line utility fails to verify the cryptographic signature and authorization of Online Certificate Status Protocol (OCSP) responses. An on-path network attacker or malicious responder can exploit this vulnerability by returning a forged response with an invalid signature, causing revoked digital certificates to be accepted as valid.
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Description OSIDB Bzimport 2026-10-29 18:26:06 UTC 
Botan is a C++ cryptography library. From 1.11.34 until 3.13.0, the botan ocsp_check command requested an OCSP response from a certificate's Authority Information Access URL without verifying the response signature or authorizing the signer. A malicious responder or on-path attacker could return a matching and timely GOOD response with an empty, invalid, or unauthorized signature, causing a revoked certificate to produce exit status 0 and OCSP check OK output. Only the command-line interface is affected. This issue is fixed in version 3.13.0.