Medium severity · published May 9, 2026
CVE-2026-42310
Pillow: PDF Parsing Trailer Infinite Loop (DoS)
5.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PI
Pillow · python-pillow
>= 4.2.0, < 12.2.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42310
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42310
Patch
https://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468
Issue Tracking
https://github.com/python-pillow/Pillow/pull/9519
Product
https://github.com/python-pillow/Pillow/releases/tag/12.2.0
Patch
https://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7
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