VDB
CVE-2026-96641
CVE-2026-96641
PUBLISHED
CVSS 6.5 MEDIUM
Reported by GitHub_M · Published October 21, 2026
Pillow is a Python imaging library. Prior to 13.0.0, PILfont text-width accumulation in src/_imaging.c checks positive glyph advances against INT_MAX but does not check negative advances against INT_MIN. Repeating a signed 16-bit advance of -32768 can therefore execute a signed C integer overflow in xsize += dx, producing a large positive width from a negative mathematical result. Applications that use getlength(), getsize(), or derived layout, quota, serialization, or allocation calculations can experience logic-integrity errors or resource consumption, while the high-level mask path commonly retains a decompression-bomb check. This issue is fixed in version 13.0.0.
Risk Scores
CVSS 3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| python-pillow | Pillow | < 13.0.0 |
| chainguard | nemo-gym | 0 |
| chainguard | py3-pytorch-cuda-13.0 | 0 |
| python-pillow | Pillow | 0 |
| chainguard | nemo-rl-cuda-13.0 | 0 |
| PyPI | Pillow | 0 |
| chainguard | superset-fips-6.1 | 0 |
Timeline
- Oct 21, 2026 CVE Published
- Oct 22, 2026 CVE Updated
- Oct 22, 2026 EPSS Score
- Oct 22, 2026 Coalition ESS Score
- Oct 25, 2026 EPSS Score
- Oct 29, 2026 EPSS Score
- Oct 30, 2026 Security Advisory
References
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rm8-3hmm-39fg x_refsource_CONFIRM
- https://github.com/python-pillow/Pillow/pull/10010 x_refsource_MISC
- https://github.com/python-pillow/Pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4 x_refsource_MISC
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-96641 advisory
- https://github.com/advisories/GHSA-4rm8-3hmm-39fg advisory