Botan: Online OCSP redirects enable blind requests to internal HTTP services

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-118766
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-29 18:17:28 UTC
Updated2026-10-30 19:37:07 UTC
DescriptionBotan 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.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

EPSS: 0.000970000 probability, percentile 0.006990000 (date 2026-10-30)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
Low

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Randombit Botan affected < 3.13.0 Not specified

References

ReferenceSourceLinkTags
github.com/randombit/botan/pull/5815 [email protected] github.com
github.com/randombit/botan/commit/9791ca39a556c76186b1fc943c7d8d460712d58f [email protected] github.com
github.com/randombit/botan/security/advisories/GHSA-9qgq-q9j4-4f82 [email protected] github.com
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