High severity · published Oct 19, 2026
CVE-2026-112901
Pillow: ReDoS in XbmImagePlugin: 512-byte file stalls Image.open() for minutes
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
Pillow is a Python imaging library. Prior to 13.0.0, Pillow's XBM header parser is vulnerable to regular-expression denial of service. In XbmImageFile._open, when an application calls Image.open() on a small crafted XBM file, XbmImagePlugin applies a backtracking expression to the attacker-controlled header before image dimensions are accepted, stalling a worker for minutes and denying service. This issue is fixed in version 13.0.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PI
Pillow · python-pillow
< 13.0.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-112901
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-112901
Patch
https://github.com/python-pillow/Pillow/commit/2852a3e3d568997ddec745fc800991f138878f4b
Release Notes
https://github.com/python-pillow/Pillow/releases/tag/13.0.0
Exploit
https://github.com/python-pillow/Pillow/security/advisories/GHSA-xgh8-jp6q-p5x8
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