{"id":"CVE-2025-11680","aliases":["BELL-CVE-2025-11680","DEBIAN-CVE-2025-11680","EUVD-2025-35055","GHSA-7h7w-vjr9-r6m8","UBUNTU-CVE-2025-11680"],"status":"published","title":"Out-of-bounds Write in libwebsockets PNG parsing","description":"Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.","severity":{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00394,"percentile":0.34024,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2025-10-20T14:04:06Z","modified":"2026-10-08T22:10:00Z","products":[{"vendor":"warmcat","product":"libwebsockets"}],"references":[{"url":"https://libwebsockets.org/git/libwebsockets/commit?id=2b715249f39291c86443b969a1088d59b6a89b78","tags":["patch","vendor-advisory","report"]},{"url":"https://www.nozominetworks.com/labs/vulnerability-advisories-cve-2025-11680","tags":["third-party-advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-11680"},{"url":"https://github.com/advisories/GHSA-7h7w-vjr9-r6m8"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2025-11680","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-11680","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-11680","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-11680","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-11680","title":"Out-of-bounds Write in libwebsockets PNG parsing","description":"Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.","status":"published","published":"2025-10-20T14:04:06.854Z","modified":"2025-10-20T14:34:57.848Z","cvss":[{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:32:50.872559Z"}],"euvd":[{"id":"EUVD-2025-35055","description":"Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.","status":"published","published":"2025-10-20T14:04:06Z","modified":"2025-10-20T14:34:57Z","cvss":[{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T20:31:29.921127Z"}],"ghsa":[{"id":"GHSA-7h7w-vjr9-r6m8","title":"Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG...","description":"Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.","status":"published","published":"2025-10-20T15:30:25Z","modified":"2025-10-20T15:30:36Z","cvss":[{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:04:01.823376Z"}],"nvd":[{"id":"CVE-2025-11680","description":"Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.","status":"published","published":"2025-10-20T14:15:40.52Z","modified":"2026-10-08T22:10:00.563Z","cvss":[{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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":"medium","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:11:39.069866Z"}],"osv":[{"id":"DEBIAN-CVE-2025-11680","description":"Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.","status":"withdrawn","published":"2025-10-20T14:15:40Z","modified":"2025-11-04T14:19:38.12736Z","cvss":[{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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":"medium"}],"updated_at":"2026-11-02T15:45:45.102284Z"},{"id":"UBUNTU-CVE-2025-11680","description":"Out-of-bounds Write in unfilter_scanline in warmcat libwebsockets allows, when the LWS_WITH_UPNG flag is enabled during compilation and the HTML display stack is used, to write past a heap allocated buffer possibly causing a crash, when the user visits an attacker controlled website that contains a crafted PNG file with a big width value that causes an integer overflow which value is used for determining the size of a heap allocation.","status":"withdrawn","published":"2025-10-20T14:15:00Z","modified":"2026-02-12T06:33:30.845951Z","cvss":[{"version":"4.0","score":5.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:55:20.144818Z"},{"id":"BELL-CVE-2025-11680","title":"CVE-2025-11680 does not affect BellSoft software","status":"withdrawn","published":"2025-10-23T06:06:32.642149Z","modified":"2026-06-19T07:15:04.32109808Z","updated_at":"2026-11-02T15:28:21.227396Z"}]}}