{"id":"CVE-2026-116740","state":"PUBLISHED","title":"libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser","description":"libcss through 0.9.2 contains a NULL pointer dereference vulnerability in mq_parse_media_query() that allows remote attackers to crash consumers by supplying media lists ending in a comma. Attackers can serve a stylesheet whose @media or @import media list has a trailing comma, causing NetSurf or other parsers to crash.","publishedAt":"2026-10-26T21:52:39.177Z","updatedAt":"2026-10-26T21:52:39.177Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["netsurf-browser libcss"],"affected":[{"vendor":"netsurf-browser","product":"libcss","packageURL":"pkg:github/netsurf-browser/libcss","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.9.2","versionType":"custom"}],"repo":"https://github.com/netsurf-browser/libcss"}],"references":["https://github.com/netsurf-browser/libcss/commit/006ffc4096040da13690abc380e5f828ec08284d","https://github.com/netsurf-browser/libcss","https://github.com/netsurf-browser/libcss/blob/release/0.9.2/src/parse/mq.c#L984","https://hackmd.io/@haindpwn/libcss-media-list-null-deref","https://www.vulncheck.com/advisories/libcss-through-0.9.2-null-pointer-dereference-via-media-query-parser"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:10:43.281Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/116xxx/CVE-2026-116740.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-116740","state":"PUBLISHED","datePublished":"2026-10-26T21:52:39.177Z","dateUpdated":"2026-10-26T21:52:39.177Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-26T20:23:36.353Z"},"containers":{"cna":{"title":"libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser","descriptions":[{"lang":"en","value":"libcss through 0.9.2 contains a NULL pointer dereference vulnerability in mq_parse_media_query() that allows remote attackers to crash consumers by supplying media lists ending in a comma. Attackers can serve a stylesheet whose @media or @import media list has a trailing comma, causing NetSurf or other parsers to crash."}],"affected":[{"vendor":"netsurf-browser","product":"libcss","packageURL":"pkg:github/netsurf-browser/libcss","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.9.2","versionType":"custom"}],"repo":"https://github.com/netsurf-browser/libcss"}],"references":[{"url":"https://github.com/netsurf-browser/libcss/commit/006ffc4096040da13690abc380e5f828ec08284d","tags":["patch"],"name":"Patch Commit"},{"url":"https://github.com/netsurf-browser/libcss","tags":["product"]},{"url":"https://github.com/netsurf-browser/libcss/blob/release/0.9.2/src/parse/mq.c#L984","tags":["technical-description"]},{"url":"https://hackmd.io/@haindpwn/libcss-media-list-null-deref","tags":["third-party-advisory"]},{"url":"https://www.vulncheck.com/advisories/libcss-through-0.9.2-null-pointer-dereference-via-media-query-parser","name":"VulnCheck Advisory: libcss through 0.9.2 NULL Pointer Dereference via Media-Query Parser","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-26T21:52:39.177Z"},"datePublic":"2026-08-30T00:00:00.000Z","credits":[{"lang":"en","value":"HaiND from the Post and Telecommunication Institute of Technology","type":"finder"},{"lang":"en","value":"metan-ucw","type":"remediation developer"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}