{"id":"CVE-2026-120251","published":"2026-11-01T01:17:19.110","lastModified":"2026-11-01T01:17:19.110","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.","cvssScore":5.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwes":["CWE-835"],"vendors":[],"products":[],"references":[{"url":"https://github.com/cgohlke/imagecodecs","tags":[]},{"url":"https://github.com/cgohlke/imagecodecs/blob/v2026.10.10/3rdparty/ccitt/ccitt.c#L1449","tags":[]},{"url":"https://github.com/cgohlke/imagecodecs/issues/158","tags":[]},{"url":"https://www.vulncheck.com/advisories/imagecodecs-2026.3.6-through-2026.10.10-infinite-loop-via-ccittfax4-decode","tags":[]}],"exploitRefs":[{"url":"https://github.com/cgohlke/imagecodecs","tags":[]},{"url":"https://github.com/cgohlke/imagecodecs/blob/v2026.10.10/3rdparty/ccitt/ccitt.c#L1449","tags":[]},{"url":"https://github.com/cgohlke/imagecodecs/issues/158","tags":[]}],"hasPoc":true,"ai":null}