| Name | CVE-2026-40192 |
| Description | Pillow is a Python imaging library. Versions 10.3.0 through 12.1.1 did not limit the amount of GZIP-compressed data read when decoding a FITS image, making them vulnerable to decompression bomb attacks. A specially crafted FITS file could cause unbounded memory consumption, leading to denial of service (OOM crash or severe performance degradation). If users are unable to immediately upgrade, they should only open specific image formats, excluding FITS, as a workaround. |
| 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) | bullseye | 8.1.2+dfsg-0.3+deb11u2 | fixed |
| bullseye (security) | 8.1.2+dfsg-0.3+deb11u3 | fixed | |
| bookworm, bookworm (security) | 9.4.0-1.1+deb12u1 | fixed | |
| trixie, trixie (security) | 11.1.0-5+deb13u1 | vulnerable | |
| forky, sid | 12.1.1-2 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| pillow | source | bullseye | (not affected) | |||
| pillow | source | bookworm | (not affected) | |||
| pillow | source | (unstable) | (unfixed) |
[bookworm] - pillow <not-affected> (Vulnerable code not present)
[bullseye] - pillow <not-affected> (Vulnerable code not present)
https://github.com/python-pillow/Pillow/security/advisories/GHSA-whj4-6x5x-4v2j
https://github.com/python-pillow/Pillow/pull/9521
Introduced with: https://github.com/python-pillow/Pillow/commit/142473c7b43a72b5dba534a26cb614b5b207ada5 (10.3.0)
Fixed by: https://github.com/python-pillow/Pillow/commit/3cb854e8b2bab43f40e342e665f9340d861aa628 (12.2.0)