Medium severity · published May 9, 2026
CVE-2026-42308
Pillow: Integer overflow when processing fonts
5.5
CVSS
0.1%
EPSS
No
On KEV
Description
Pillow is a Python imaging library. Prior to version 12.2.0, if a font advances for each glyph by an exceeding large amount, when Pillow keeps track of the current position, it may lead to an integer overflow. 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)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PI
Pillow · python-pillow
< 12.2.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42308
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42308
Product
https://github.com/python-pillow/Pillow/releases/tag/12.2.0
Vendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-wjx4-4jcj-g98j
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