PT-2026-37199 · Pypi · Pillow

Kexinoh · Published 2026-05-04 · Updated 2026-05-12 · CVE-2026-42310

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Pillow versions 4.2.0 through 12.1.x

Description A flaw in the PdfParser allows an attacker to supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This occurs because the parser follows Prev pointers in PDF trailers to read cross-reference sections; if a pointer references an offset already processed, either by pointing to itself or forming a cycle, the parser enters an infinite loop.

Recommendations Update to version 12.2.0.

Fix

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

BIT-PILLOW-2026-42310

CVE-2026-42310

GHSA-R73J-PQJ5-W3X7

Affected Products

Pillow

References · 17

• https://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468 · Patch
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7 · Vendor Advisory
• https://github.com/python-pillow/Pillow/pull/9519 · Patch
• https://osv.dev/vulnerability/BIT-pillow-2026-42310 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-42310 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-42310 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-42310 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42310 · Security Note
• https://ubuntu.com/security/CVE-2026-42310 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-r73j-pqj5-w3x7 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-42310 · Vendor Advisory
• https://github.com/python-pillow/Pillow/releases/tag/12.2.0 · Note
• https://github.com/python-pillow/Pillow · Note
• https://t.me/cveNotify/163259 · Telegram Post
• https://twitter.com/CVEarity/status/2053816299151897055 · Twitter Post