Vulnerability details
CVE-2026-96643
python-pillow Pillow
Pillow: PNG eXIf chunk makes EXIF parsing run in quadratic time
CVSS 4.0
7.1High
Official description
Pillow is a Python imaging library. From 11.0.0 until 13.0.0, Exif.load() in src/PIL/Image.py repeatedly slices the remaining EXIF data while it begins with the six-byte Exif header. src/PIL/PngImagePlugin.py accepts an uncapped PNG eXIf chunk, so a file filled with repeated headers causes a new shrinking copy on every iteration and quadratic CPU work. The condition is reachable through Image.getexif(), Image._getexif(), and ImageOps.exif_transpose(), including common photo-upload rotation workflows. This issue is fixed in version 13.0.0.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.1High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| python-pillow | Pillow | >= 11.0.0, < 13.0.0 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://github.com/python-pillow/Pillow/security/advisories/GHSA-g4qv-2jxx-769h x_refsource_CONFIRM
- https://github.com/python-pillow/Pillow/pull/10073 x_refsource_MISC
- https://github.com/python-pillow/Pillow/commit/806e38381c781f32bbd22f4cd026678acd40fd6c x_refsource_MISC
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 x_refsource_MISC
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Details
- Published
- 2026-10-22
- Last updated
- 2026-10-24
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.37%
Probability of exploitation in 30 days
31.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-407Inefficient Algorithmic Complexity