Bug 2563611 (CVE-2026-118766)

Summary: CVE-2026-118766 botan: Botan: Server-Side Request Forgery via OCSP client HTTP redirect
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: jlanda, kshier, rbobbitt, rhel-process-autobot, simaishi, stcannon, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Botan. Its Online Certificate Status Protocol (OCSP) client improperly follows HTTP redirects when sending certificate validation requests. A malicious responder or network attacker can exploit this issue to redirect the client into making a blind request to an otherwise inaccessible internal service. This Server-Side Request Forgery (SSRF) flaw can allow attackers to interact with internal systems or infer internal service availability via response timing.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2568161, 2568165, 2568167, 2568169, 2568171    
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Description OSIDB Bzimport 2026-10-29 18:19:43 UTC 
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.