CVE-2026-42310
MEDIUM5.5EPSS 0.01%Pillow has a PDF Parsing Trailer Infinite Loop (DoS)
Published: 5/4/2026Modified: 5/13/2026
Description
Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This issue has been patched in version 12.2.0.
Affected packages (3)
- Bitnami/pillow>= 4.2.0, < 12.2.0
- Debian/pillowfrom 0
- PyPI/pillow>= 4.2.0, < 12.2.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-42310
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-42310
- PATCHhttps://github.com/python-pillow/Pillow
- WEBhttps://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468
- WEBhttps://github.com/python-pillow/Pillow/pull/9519
- WEBhttps://github.com/python-pillow/Pillow/releases/tag/12.2.0
- WEBhttps://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7