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.
Fix
Public exploits 1
- paktiko1986/CVE-2026-96778-pillow PoC on GitHub
Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/python-pillow/Pillow/commit/02561b8dc6117d5670d4b469fecdd02c70854f9b Patch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-g7cr-3p24-7wf7 Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-g7cr-3p24-7wf7 Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 8
- StatusAnalyzed → ModifiedNVD modified 2026-10-28 02:17
- Cpes+1 CPE criteria (now 1)NVD modified 2026-10-27 14:27
- StatusAwaiting Analysis → AnalyzedNVD modified 2026-10-27 14:27
- StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 16:46
- StatusReceived → PublishedNVD modified 2026-10-21 20:58
- StatusPublished → ReceivedNVD modified 2026-10-21 21:20
- CVSS7.7 (v4.0, 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) → 7.7 (v4.0, 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)NVD modified 2026-10-21 21:20
- First seenCVSS 7.7 · python-pillowNVD modified 2026-10-21 20:58
Affected (CPE criteria) 1
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*
References 5
- https://github.com/python-pillow/Pillow/commit/02561b8dc6117d5670d4b469fecdd02c70854f9b Patch
- https://github.com/python-pillow/Pillow/pull/10124 Issue Tracking
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 Release Notes
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-g7cr-3p24-7wf7 Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-g7cr-3p24-7wf7 Vendor Advisory