Stack-based Buffer Overflow Affecting imagecodecs package, versions [,2026.3.6)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-IMAGECODECS-22132598
- published2 Nov 2026
- disclosed1 Nov 2026
- creditDilanka Kaushal Hewage (r3vpwnx)
Introduced: 1 Nov 2026
NewCVE-2026-120252 (opens in a new tab)How to fix?
Upgrade imagecodecs to version 2026.3.6 or higher.
Overview
imagecodecs is an Imagecodecs is a Python library that provides block-oriented, in-memory buffer transformation, compression, and decompression functions for use in Tifffile, Czifile, Zarr, kerchunk, and other scientific image input/output packages.
Affected versions of this package are vulnerable to Stack-based Buffer Overflow via the jpegsof3.cpp decoder component, which performs out-of-bounds reads, applies inverted output buffer size checks, and contains an integer overflow in the pixel count calculation when processing a malicious JPEG lossless (SOF3) image. An attacker can supply a malformed JPEG file that causes the decoder to read memory beyond allocated buffer boundaries, crashing the process.