Is CVE-2026-120252 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-120252?

CVE-2026-120252 has a CVSS v3 severity of MEDIUM (5.5).

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CVE-2026-120252

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.