{"id":"CVE-2026-61845","aliases":["DEBIAN-CVE-2026-61845","EUVD-2026-114321","GHSA-6wmf-3r64-vcwv","UBUNTU-CVE-2026-61845"],"status":"published","title":"Crass: Large numeric exponents cause CPU and memory denial of service","description":"Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping the result to `Float::MAX`. 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 in version 1.0.7.","severity":{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00386,"percentile":0.33155,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-674","CWE-789"],"published":"2026-10-20T14:32:39Z","modified":"2026-11-04T03:30:20Z","fixes":[{"ecosystem":"RubyGems","package":"crass","fixed_in":["1.0.7"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"ruby-crass","fixed_in":["1.0.7-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.7"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.2-3","1.0.6-1","1.0.7-1","1.0.8-1"]},{"source":"osv","ecosystem":"Debian:13","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.6-1","1.0.7-1","1.0.8-1"]},{"source":"osv","ecosystem":"Debian:14","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.7-1"}]}],"versions":["1.0.6-1"]},{"source":"osv","ecosystem":"RubyGems","package":"crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.7"}]}],"versions":["0.0.1","0.0.2","0.1.0","0.2.0","0.2.1","1.0.0","1.0.1","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.2-2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.2-2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.2-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.2-2.1","1.0.2-3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.2-3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.6-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"ruby-crass","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.6-1ubuntu1"]}],"products":[{"vendor":"rgrove","product":"crass"}],"references":[{"url":"https://github.com/rgrove/crass/security/advisories/GHSA-6wmf-3r64-vcwv","tags":["x_refsource_CONFIRM","advisory","web","report"]},{"url":"https://github.com/rgrove/crass/commit/ea6726b7f7cf7e85b23aa2240b8512b4f8d11ad9","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/rgrove/crass/releases/tag/v1.0.7","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/crass/GHSA-6wmf-3r64-vcwv.yml","tags":["web"]},{"url":"https://rubygems.org/gems/crass/versions/1.0.7","tags":["web"]},{"url":"https://github.com/advisories/GHSA-6wmf-3r64-vcwv"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61845.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61845","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-61845","tags":["advisory"]},{"url":"https://github.com/rgrove/crass","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-61845","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-61845","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-61845","title":"Crass: Large numeric exponents cause CPU and memory denial of service","description":"Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping the result to `Float::MAX`. 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 in version 1.0.7.","status":"published","published":"2026-10-30T18:41:58.369Z","modified":"2026-10-30T19:41:24.227Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","level":"high","assessor":"cna"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T14:19:53.4444Z"}],"euvd":[{"id":"EUVD-2026-114321","description":"Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping the result to `Float::MAX`. 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 in version 1.0.7.","status":"published","published":"2026-10-30T18:41:58Z","modified":"2026-10-30T19:41:24Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","level":"high"}],"updated_at":"2026-11-02T16:59:02.288036Z"}],"ghsa":[{"id":"GHSA-6wmf-3r64-vcwv","title":"Crass : Large numeric exponents cause CPU and memory denial of service","description":"### Impact\n\nCrass converts CSS scientific notation number values with unbounded exponentiation before it clamps the result to `Float::MAX`. 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.\n\n### Patches\n\nThis is fixed in Crass 1.0.7.\n\n### Related\n\n- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/crass/GHSA-6wmf-3r64-vcwv.yml","status":"published","published":"2026-10-20T14:32:39Z","modified":"2026-10-20T14:32:40Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","level":"high"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:41:33.669646Z"}],"nvd":[{"id":"CVE-2026-61845","description":"Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping the result to `Float::MAX`. 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 in version 1.0.7.","status":"published","published":"2026-10-30T19:18:28.197Z","modified":"2026-10-30T20:17:11.263Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T14:13:05.268617Z"}],"osv":[{"id":"CVE-2026-61845","title":"Crass: Large numeric exponents cause CPU and memory denial of service","description":"Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping the result to `Float::MAX`. 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 in version 1.0.7.","status":"published","published":"2026-10-30T18:41:58.369Z","modified":"2026-11-01T02:47:30.843518635Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","level":"high"}],"cwes":["CWE-789"],"updated_at":"2026-11-02T15:45:12.933503Z"},{"id":"DEBIAN-CVE-2026-61845","description":"Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping the result to `Float::MAX`. 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 in version 1.0.7.","status":"published","published":"2026-10-30T19:18:28.197Z","modified":"2026-10-31T06:00:09.223343305Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:45:57.932517Z"},{"id":"GHSA-6wmf-3r64-vcwv","title":"Crass : Large numeric exponents cause CPU and memory denial of service","description":"### Impact\n\nCrass converts CSS scientific notation number values with unbounded exponentiation before it clamps the result to `Float::MAX`. 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.\n\n### Patches\n\nThis is fixed in Crass 1.0.7.\n\n### Related\n\n- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/crass/GHSA-6wmf-3r64-vcwv.yml","status":"published","published":"2026-10-20T14:32:39Z","modified":"2026-10-20T14:45:03.938633122Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","level":"high"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T15:46:40.308826Z"},{"id":"UBUNTU-CVE-2026-61845","description":"Crass is a Ruby CSS parser that's fully compliant with the CSS Syntax Level 3 specification. Prior to 1.0.7, Crass converts `CSS scientific notation` number values with unbounded exponentiation before clamping the result to `Float::MAX`. 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 in version 1.0.7.","status":"published","published":"2026-10-30T19:18:00Z","modified":"2026-11-05T04:30:40Z","cvss":[{"version":"4.0","score":8.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","level":"high"}],"updated_at":"2026-11-05T13:33:42.748455Z"}]}}