RUSTSEC-2026-0104

    Dashboard / Vulnerabilities / RUSTSEC-2026-0104

    RUSTSEC-2026-0104

    Published: 22 Apr 2026Last Modified: 19 Sept 2026

    Summary: Reachable panic in certificate revocation list parsing

    Details: A panic was reachable when parsing certificate revocation lists via [`BorrowedCertRevocationList::from_der`] or [`OwnedCertRevocationList::from_der`]. This was the result of mishandling a syntactically valid empty `BIT STRING` appearing in the `onlySomeReasons` element of a `IssuingDistributionPoint` CRL extension. This panic is reachable prior to a CRL's signature being verified. Applications that do not use CRLs are not affected. Thank you to [@tynus3](https://github.com/tynus3) for the report.

    References: https://crates.io/crates/rustls-webpki, https://rustsec.org/advisories/RUSTSEC-2026-0104.html

    Affected packages

    Package

    Name: rustls-webpki

    Purl: pkg:cargo/rustls-webpki

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0.0.0-0
    Fixed -0.103.13

    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