CVE-2026-118766

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    CVE-2026-118766

    Published: 29 Oct 2026Last Modified: 5 Nov 2026

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

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118766.json, https://github.com/randombit/botan/security/advisories/GHSA-9qgq-q9j4-4f82, https://nvd.nist.gov/vuln/detail/CVE-2026-118766, https://github.com/randombit/botan/commit/9791ca39a556c76186b1fc943c7d8d460712d58f, https://github.com/randombit/botan/pull/5815

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -2a81eef56c96c237e590c27f9a75e60317c9c700

    Affected versions

    3.12.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-118766 | CVE-DB