CVE-2026-96778highCWE-787

CVE-2026-96778: high-severity vulnerability in python-pillow Pillow

Pillow: Heap buffer overflow writing JPEG comment after ICC profile fills buffer

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41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 7.7epss 0.5%
from disclosure to weapon7 days
Published on NVDOct 21
1st PoC+7d
Pillow is a Python imaging library. From 9.4.0 until 13.0.0, ImagingJpegEncode() in src/libImaging/JpegEncode.c can call jpeg_write_marker() for a JPEG COM comment when an ICC profile has exactly filled the 65536-byte encoder buffer. libjpeg writes one byte before checking the exhausted free_in_buffer counter, which then wraps and permits the attacker-controlled comment and subsequent compressed image data to overwrite adjacent heap memory. Re-saving an untrusted image as JPEG while preserving its ICC profile and forwarded comment can crash the process and may enable code execution in suitable runtime and heap layouts. This issue is fixed in version 13.0.0.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
python-pillow · Pillow
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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