| Name | CVE-2026-96641 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| pillow (PTS) | bookworm, bookworm (security) | 9.4.0-1.1+deb12u1 | vulnerable |
| trixie | 11.1.0-5+deb13u4 | vulnerable | |
| trixie (security) | 11.1.0-5+deb13u3 | vulnerable | |
| forky | 12.3.0-1 | vulnerable | |
| sid | 13.0.0-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| pillow | source | (unstable) | 13.0.0-1 |
https://github.com/python-pillow/Pillow/security/advisories/GHSA-4rm8-3hmm-39fg
https://github.com/python-pillow/Pillow/pull/10010
Fixed by: https://github.com/python-pillow/Pillow/commit/80de4be9e38d3a6148dd4d8491eb80cd12b760a4 (13.0.0)