CVE-2026-61847

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    CVE-2026-61847

    Published: 30 Oct 2026Last Modified: 1 Nov 2026

    Summary: Crass: A large number of adjacent CSS comments can trigger a SystemStackError

    Details: Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, when the `:preserve_comments` option is not enabled, which is the default, Crass discards CSS comments by recursively consuming the next token. An attacker-provided stylesheet containing a very large number of adjacent comments can cause excessive recursion and trigger a `SystemStackError`, denying service to the parsing application. Preserving comments avoids this recursive path. 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-2026-61847.json, https://github.com/rgrove/crass/security/advisories/GHSA-wwpr-jff3-395c, https://nvd.nist.gov/vuln/detail/CVE-2026-61847, https://github.com/rgrove/crass/commit/25d78cc607c54262e9d43ea1930f3ba5bb03dfb5

    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-2026-61847 | CVE-DB