PT-2026-37199 · Pypi+3 · Pillow+3

Kexinoh · CVE-2026-42310 · Published 2026-05-04 · Updated 2026-07-13

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.

Exploit

Fix

DoS

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

BDU:2026-10817

BIT-PILLOW-2026-42310

CLEANSTART-2026-EN66750

CLEANSTART-2026-FG72002

CLEANSTART-2026-RF67070

CVE-2026-42310

ECHO-55B6-3B95-3506

GHSA-R73J-PQJ5-W3X7

OPENSUSE-SU-2026:20831-1

PYSEC-2026-2874

SUSE-SU-2026:1842-1

SUSE-SU-2026:21861-1

SUSE-SU-2026:2234-1

USN-8399-1

Affected Products

Linuxmint

Pillow

Red Os

Ubuntu

References · 67

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42310.json · Exploit
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7 · Vendor Advisory
• https://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468 · Patch
• https://github.com/python-pillow/Pillow/pull/9519 · Patch
• https://osv.dev/vulnerability/GHSA-r73j-pqj5-w3x7 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-42310 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-48522 · Security Note
• https://osv.dev/vulnerability/CVE-2026-42310 · Vendor Advisory
• https://osv.dev/vulnerability/CLEANSTART-2026-RF67070 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42310 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-10817 · Security Note
• https://osv.dev/vulnerability/PYSEC-2026-2874 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-25990 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-42310 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42308 · Vendor Advisory