CVE-2026-96642: python-pillow pillow Infinite Loop
CVSS: 7.1v4.0HighReceived
AliasesDEBIAN-CVE-2026-96642
Published 21-10-2026Last modified 21-10-2026
Vulnerability summary
CVE-2026-96642 is a high (CVSS 7.1) Infinite Loop vulnerability in python-pillow pillow.
CVSS score
7.1/10
010
High · v4.0 (CVE.org)EPSS score
Not scored
0%100%
No EPSS score yetKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 21-10-2026PublishedVulnerability first disclosed.
Description
Pillow is a Python imaging library. Prior to 13.0.0, the TarIO initializer in src/PIL/TarIO.py accepts a negative octal member size and computes a backward seek that returns to the same 512-byte header. When the requested member name does not match, the parser repeatedly reads that header, consumes a full CPU core, and never returns. TarIO is reached only when an application directly uses PIL.TarIO.TarIO rather than the default Image.open() path. This issue is fixed in version 13.0.0.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.1Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NSourcesAll 2 agree
- NVDNIST7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS trend
No EPSS score has been published for this record yet.
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- pillowAll versions (No fix recorded)
Python-pillow1 product
- pillow< 13.0.0
2 vendors · 2 products
References
5 links- github.com/python-pillow/Pillow/security/advisories/GHSA-3j72-p6qg-6xp7X Refsource CONFIRM
- github.com/python-pillow/Pillow/pull/10012X Refsource MISC
- github.com/python-pillow/Pillow/releases/tag/13.0.0X Refsource MISC
