CVE-2026-118769

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    CVE-2026-118769

    Published: 29 Oct 2026Last Modified: 1 Nov 2026

    Summary: Botan: Integer overflow when reporting block size in FFI can cause memory corruption

    Details: Botan is a C++ cryptography library. From 2.1.0 until 3.13.0, the Botan C API function botan_block_cipher_block_size converted a size_t block size to int without a bounds check. In an application that accepts external algorithm parameter strings and uses the FFI raw ECB mode, an attacker can select the variable-block-size Lion cipher so that the reported size is truncated, the caller allocates insufficient memory, and later block processing causes memory corruption. The C++ API and normally used C API modes such as CBC and CTR are unaffected. This issue is fixed in version 3.13.0.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118769.json, https://github.com/randombit/botan/security/advisories/GHSA-c68p-822g-jfvr, https://nvd.nist.gov/vuln/detail/CVE-2026-118769, https://github.com/randombit/botan/commit/c6089ab7fab616517d56c447c93e13a5c57a0af3, https://github.com/randombit/botan/pull/5805

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 7bdffd52a96e08e9452d1985258376a3925a497b
    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-2026-118769 | CVE-DB