Vulnerability · Published Jul 1, 2025 · Assigned by GitHub_M

CVE-2025-48379Pillow Vulnerable to Write Buffer Overflow on BCn encoding

High 7.1

In plain English

A high-severity heap buffer overflow in Pillow from python-pillow. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.3%top 74.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Pillow is a Python imaging library. In versions 11.2.0 to before 11.3.0, there is a heap buffer overflow when writing a sufficiently large (>64k encoded with default settings) image in the DDS format due to writing into a buffer without checking for available space. This only affects users who save untrusted data as a compressed DDS image. This issue has been patched in version 11.3.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.23	py3-pillow	11.3.0-r0	ALPINE-CVE-2025-48379
Alpine:v3.24	py3-pillow	11.3.0-r0	ALPINE-CVE-2025-48379
PyPI	pillow	11.3.0	GHSA-xg8h-j46f-w952
PyPI	pillow	11.3.0	PYSEC-2025-61

Affected products (as reported)

Vendor	Product	Versions
python-pillow	Pillow	>= 11.2.0, < 11.3.0

Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

References

https://github.com/python-pillow/Pillow/security/advisories/GHSA-xg8h-j46f-w952 x_refsource_CONFIRM
https://github.com/python-pillow/Pillow/pull/9041 x_refsource_MISC
https://github.com/python-pillow/Pillow/commit/ef98b3510e3e4f14b547762764813d7e5ca3c5a4 x_refsource_MISC
https://github.com/python-pillow/Pillow/releases/tag/11.3.0 x_refsource_MISC