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Vulnerabilities

Security fix · CVE-2026-61845

Crass : Large numeric exponents cause CPU and memory denial of service

Published Oct 20, 2026 · catalog updated Oct 31, 2026 · Red Hat Red Hat Enterprise Linux

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-61845. EPSS is 0.39%. Act only if a listed version of Red Hat Red Hat Enterprise Linux is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Advisory link
Affected products
Debian:12 ruby-crass · Debian:13 ruby-crass · Debian:14 ruby-crass · RubyGems crass

### Impact Crass converts CSS scientific notation number values with unbounded exponentiation before it clamps the result to . Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, possibly resulting in a crash. ### Patches This is fixed in Crass 1.0.7. ### Related - https://github.com/rubysec/ruby-advisory-db/blob/master/gems/crass/GHSA-6wmf-3r64-vcwv.yml

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 ruby-crass1.0.2-3, 1.0.6-1, 1.0.7-1
  • Debian:13 ruby-crass1.0.6-1, 1.0.7-1, 1.0.8-1
  • Debian:14 ruby-crass0 → 1.0.7-1
  • RubyGems crass0 → 1.0.7

How to fix CVE-2026-61845

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-61845. EPSS is 0.39%. Act only if a listed version of Red Hat Red Hat Enterprise Linux is installed.

Which versions are affected?

Compare what you have installed with 1.0.2-3, 1.0.6-1, 1.0.7-1, 1.0.6-1, 1.0.7-1, 1.0.8-1, 0 → 1.0.7-1, 0 → 1.0.7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-674; CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.39%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 20, 2026 · GitHub Advisory Database

    Detected

    ### Impact Crass converts CSS scientific notation number values with unbounded exponentiation before it clamps the result to . Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, possibly resulting in a crash. ### Patches This is fixed in Crass 1.0.7. ### Related - https://github.com/rubysec/ruby-advisory

  2. Oct 20, 2026 · GitHub Advisory Database

    Fix available

    crass fixed in 1.0.7

  3. Oct 20, 2026 · GitHub Advisory Database

    Fix available

    crass fixed in 1.0.7

  4. Oct 20, 2026 · GitHub Advisory Database

    Updated

    ### Impact Crass converts CSS scientific notation number values with unbounded exponentiation before it clamps the result to . Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, possibly resulting in a crash. ### Patches This is fixed in Crass 1.0.7. ### Related - https://github.com/rubysec/ruby-advisory

  5. Oct 31, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    ruby-crass fixed in 1.0.7-1

  6. Oct 31, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    ruby-crass fixed in 1.0.7-1

  7. Oct 31, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    ### Impact Crass converts CSS scientific notation number values with unbounded exponentiation before it clamps the result to . Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, possibly resulting in a crash. ### Patches This is fixed in Crass 1.0.7. ### Related - https://github.com/rubysec/ruby-advisory

  8. Oct 31, 2026 · Trivy Vulnerability DB

    Updated

    Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts number values with unbounded exponentiation before clamping the result to . Applications that use Crass to parse attacker-controlled CSS strings can be forced to spend disproportionate CPU and memory parsing a tiny input, potentially resulting in a crash. This issue is fixed

Sources

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Red Hat Security DataNov 1, 2026
  • FIRST EPSSOct 31, 2026
  • Trivy Vulnerability DBOct 31, 2026
  • OpenSSF OSV / OSV ScannerOct 31, 2026
  • GitHub Advisory DatabaseOct 29, 2026
  • OpenSSF OSV / OSV ScannerOct 29, 2026
  • CVE.orgOct 21, 2026