{"id":"CVE-2026-120251","aliases":["EUVD-2026-114748","GHSA-j736-6c4x-7rx7","openSUSE-SU-2026:12406-1"],"status":"published","title":"imagecodecs 2026.3.6 through 2026.10.10 Infinite Loop via ccittfax4_decode()","description":"imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in ccitt_fax4_decode_size() that allows attackers to hang the calling process by supplying a crafted CCITT Group 4 stream. Attackers can provide an 8-byte G4 stream lacking EOFB to ccittfax4_decode() or the numcodecs Ccittfax4 codec, consuming full CPU until the process is killed.","severity":{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00124,"percentile":0.0215,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-835"],"published":"2026-11-01T00:57:14Z","modified":"2026-11-06T18:57:26Z","fixes":[{"ecosystem":"openSUSE:Tumbleweed","package":"python-imagecodecs","fixed_in":["2026.10.10-2.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"python-imagecodecs","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2026.10.10-2.1"}]}]}],"products":[{"vendor":"cgohlke","product":"imagecodecs"}],"references":[{"url":"https://github.com/cgohlke/imagecodecs/issues/158","tags":["issue-tracking","exploit","report"]},{"url":"https://github.com/cgohlke/imagecodecs/blob/v2026.10.10/3rdparty/ccitt/ccitt.c#L1449","tags":["technical-description","article"]},{"url":"https://github.com/cgohlke/imagecodecs","tags":["product","package"]},{"url":"https://www.vulncheck.com/advisories/imagecodecs-2026.3.6-through-2026.10.10-infinite-loop-via-ccittfax4-decode","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120251","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-j736-6c4x-7rx7"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120251.json","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-120251","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-120251","title":"imagecodecs 2026.3.6 through 2026.10.10 Infinite Loop via ccittfax4_decode()","description":"imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in ccitt_fax4_decode_size() that allows attackers to hang the calling process by supplying a crafted CCITT Group 4 stream. Attackers can provide an 8-byte G4 stream lacking EOFB to ccittfax4_decode() or the numcodecs Ccittfax4 codec, consuming full CPU until the process is killed.","status":"published","published":"2026-11-01T00:57:14.911Z","modified":"2026-11-06T18:57:26.486Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-835"],"updated_at":"2026-11-06T19:59:19.701997Z"}],"euvd":[{"id":"EUVD-2026-114748","description":"imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in ccitt_fax4_decode_size() that allows attackers to hang the calling process by supplying a crafted CCITT Group 4 stream. Attackers can provide an 8-byte G4 stream lacking EOFB to ccittfax4_decode() or the numcodecs Ccittfax4 codec, consuming full CPU until the process is killed.","status":"published","published":"2026-11-01T00:57:14Z","modified":"2026-11-06T18:57:26Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-06T20:06:05.664912Z"}],"ghsa":[{"id":"GHSA-j736-6c4x-7rx7","title":"imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in...","description":"imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in ccitt_fax4_decode_size() that allows attackers to hang the calling process by supplying a crafted CCITT Group 4 stream. Attackers can provide an 8-byte G4 stream lacking EOFB to ccittfax4_decode() or the numcodecs Ccittfax4 codec, consuming full CPU until the process is killed.","status":"published","published":"2026-11-01T03:30:38Z","modified":"2026-11-01T03:30:43Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T15:14:54.535223Z"}],"nvd":[{"id":"CVE-2026-120251","description":"imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in ccitt_fax4_decode_size() that allows attackers to hang the calling process by supplying a crafted CCITT Group 4 stream. Attackers can provide an 8-byte G4 stream lacking EOFB to ccittfax4_decode() or the numcodecs Ccittfax4 codec, consuming full CPU until the process is killed.","status":"published","published":"2026-11-01T01:17:19.11Z","modified":"2026-11-06T19:17:42.463Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-835"],"updated_at":"2026-11-06T22:02:16.10095Z"}],"osv":[{"id":"CVE-2026-120251","title":"imagecodecs 2026.3.6 through 2026.10.10 Infinite Loop via ccittfax4_decode()","description":"imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in ccitt_fax4_decode_size() that allows attackers to hang the calling process by supplying a crafted CCITT Group 4 stream. Attackers can provide an 8-byte G4 stream lacking EOFB to ccittfax4_decode() or the numcodecs Ccittfax4 codec, consuming full CPU until the process is killed.","status":"published","published":"2026-11-01T00:57:14.911Z","modified":"2026-11-08T02:30:51.935490759Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-835"],"updated_at":"2026-11-07T11:15:38.581573Z"},{"id":"openSUSE-SU-2026:12406-1","title":"python313-imagecodecs-2026.10.10-2.1 on GA media","description":"These are all security issues fixed in the python313-imagecodecs-2026.10.10-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-11-03T00:00:00Z","modified":"2026-11-04T17:23:24.656231203Z","updated_at":"2026-11-04T17:43:22.558805Z"}]}}