CVE-2026-120252

MediumCVSS 5.5/10Last modified Nov 2, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-121

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
cgohlke	imagecodecs	>= 2023.1.23, <= 2026.10.10

References

Timeline

Published: Nov 1, 2026
Last modified: Nov 2, 2026
NVD status: Awaiting Analysis

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