CVE-2026-61846

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    CVE-2026-61846

    Published: 30 Oct 2026Last Modified: 5 Nov 2026

    Summary: Crass: Deeply nested CSS blocks and functions can trigger a SystemStackError or excessive memory usage

    Details: Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass recursively parses `CSS simple blocks and functions` without a depth guard. An attacker-controlled CSS value containing deeply nested blocks or functions can recurse until Ruby raises `SystemStackError`: stack level too deep, or cause excessive memory usage. Version 1.0.7 adds a configurable depth limit with a conservative default. This issue is fixed in version 1.0.7.

    References: https://github.com/rgrove/crass/releases/tag/v1.0.7, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61846.json, https://github.com/rgrove/crass/security/advisories/GHSA-6jxj-px6v-747w, https://nvd.nist.gov/vuln/detail/CVE-2026-61846, https://github.com/rgrove/crass/commit/cf68287356ec6e20d51cfc4a2d0c3912b7334e99

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -cfd5daa3ce23cd7b2356acf90ecb7a02defe002c

    Affected versions

    v1.0.6
    v1.0.5
    v1.0.4
    v1.0.3
    v1.0.2
    v1.0.1
    v1.0.0

    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-2026-61846 | CVE-DB