CVE-2026-118768: Signature Bypass

Description

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.

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Weakness Type (CWE)

CWE-347 CWE-347

References

Other References

https://github.com/randombit/botan/commit/46b2a9ca59b0797184fbf7537495bda6e61a1983 https://github.com/randombit/botan/pull/5825 https://github.com/randombit/botan/security/advisories/GHSA-mpr7-9494-4qcw

Frequently Asked Questions

What is CVE-2026-118768? +

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.

How do I check if I'm vulnerable to CVE-2026-118768? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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