CVE-2026-118673

    Dashboard / Vulnerabilities / CVE-2026-118673

    CVE-2026-118673

    Published: 29 Oct 2026Last Modified: 5 Nov 2026

    Summary: KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responses

    Details: KeePassXC is a cross-platform community-driven port of the Windows application KeePass Password Safe. From 2.3.0 until 2.8.0, KeePassXC browser integration encrypts authorized responses in src/browser/BrowserMessageBuilder.cpp using a fixed 1 MiB output vector even though Botan::Sodium::crypto_box_easy() writes the plaintext length plus crypto_box_MACBYTES. A browser-protocol client that can access the per-user IPC endpoint, has a valid database association, and causes an unlocked database to generate and encrypt a sufficiently large authorized response can trigger a sequential out-of-bounds write before any response is delivered. This issue is fixed in version 2.8.0.

    References: https://github.com/keepassxreboot/keepassxc/releases/tag/2.8.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118673.json, https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3227, https://nvd.nist.gov/vuln/detail/CVE-2026-118673, https://github.com/keepassxreboot/keepassxc/commit/80e68bb4e8b89e383dd96b1bf5de169ca61367aa, https://github.com/keepassxreboot/keepassxc/pull/13679

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 4c0ed74341173482415c484a2ad07df204150213
    Fixed -1c2f23ef5914c0f442a00533def1689857afb5a7

    Affected versions

    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-2026-118673 | CVE-DB