{"affected":[{"defaultStatus":"unaffected","ecosystem":"pypi","packageName":"imagecodecs","product":"imagecodecs","source":"CNA: VulnCheck","vendor":"cgohlke","versions":[{"lessThanOrEqual":"2026.10.10","status":"affected","version":"2023.1.23","versionType":"custom"}]}],"cveId":"CVE-2026-120252","cwes":["CWE-121"],"description":"imagecodecs 2023.1.23 through 2026.10.10 contains a stack-based buffer overflow vulnerability in the lossless JPEG Define Huffman Table parser in decode_jpegsof3(). Attackers can supply a crafted lossless JPEG whose DHT symbol counts wrap an 8-bit sum, overflowing the 32-entry HufVal and HufSz stack arrays and crashing the calling process.","epss":{"date":"2026-11-02","percentile":0.03058,"score":0.00137},"exploits":[],"kev":null,"metrics":[{"score":6.8,"severity":"medium","source":"CNA: VulnCheck","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","version":"4.0"},{"score":5.5,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},{"score":6.8,"severity":"medium","source":"NVD: disclosure@vulncheck.com","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","version":"4.0"},{"score":5.5,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793641459013,"publishedAt":1793494635614,"references":[{"source":"CNA: VulnCheck","tags":["issue-tracking"],"url":"https://github.com/cgohlke/imagecodecs/issues/157"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/cgohlke/imagecodecs/blob/v2026.10.10/3rdparty/jpegsof3/jpegsof3.cpp#L394"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/cgohlke/imagecodecs"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/imagecodecs-2023.1.23-through-2026.10.10-stack-buffer-overflow-via-jpegsof3-decode"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/cgohlke/imagecodecs"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/cgohlke/imagecodecs/blob/v2026.10.10/3rdparty/jpegsof3/jpegsof3.cpp#L394"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/cgohlke/imagecodecs/issues/157"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/imagecodecs-2023.1.23-through-2026.10.10-stack-buffer-overflow-via-jpegsof3-decode"}],"remediation":[],"revision":"65eca6c5e48c1d6267935797ba60cb60fe0062cc4d7ea8ca4d784371a6283b6a","sources":[{"modifiedAt":1793641459013,"name":"CNA: VulnCheck","retrievedAt":1793642965825,"url":"https://www.cve.org/CVERecord?id=CVE-2026-120252"},{"modifiedAt":1793495839287,"name":"NVD","retrievedAt":1793578560131,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120252"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793642968980,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-120252"}],"ssvc":{"assessedAt":1793639050719,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"imagecodecs 2023.1.23 through 2026.10.10 Stack Buffer Overflow via jpegsof3_decode()","updatedAt":1793642968980}