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{"bugzilla": {"description": "imagecodecs: imagecodecs: Denial of Service via stack-based buffer overflow in lossless JPEG parser", "id": "2564504", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2564504"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["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.", "A flaw was found in imagecodecs. A stack-based buffer overflow exists in the lossless JPEG parser within the decode_jpegsof3() function due to improper validation of Huffman table symbol counts. By enticing a user or application to process a specially crafted lossless JPEG image file, an attacker could trigger stack memory corruption, causing the application to crash and resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Avoid decoding untrusted or unvalidated lossless JPEG (SOF3) images with imagecodecs.jpegsof3_decode until a fixed release is available; restrict input sources or validate JPEG SOF3 DHT symbol counts before decoding."}, "name": "CVE-2026-120252", "public_date": "2026-11-01T00:57:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-120252\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-120252\nhttps://github.com/cgohlke/imagecodecs\nhttps://github.com/cgohlke/imagecodecs/blob/v2026.10.10/3rdparty/jpegsof3/jpegsof3.cpp#L394\nhttps://github.com/cgohlke/imagecodecs/issues/157\nhttps://www.vulncheck.com/advisories/imagecodecs-2023.1.23-through-2026.10.10-stack-buffer-overflow-via-jpegsof3-decode"], "statement": "A stack-based buffer overflow was found in imagecodecs' lossless JPEG (SOF3) Huffman table parser, decode_jpegsof3(). Crafted DHT symbol counts wrap an 8-bit sum, bypassing the >17 guard and overflowing the 32-entry HufVal/HufSz stack arrays, crashing the process. This affects imagecodecs versions 2023.1.23 through 2026.10.10 when decoding attacker-supplied lossless JPEG data and results in denial of service only; no fixed release is available yet.", "threat_severity": "Moderate"}