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

What is CVE-2025-48379?

CVE-2025-48379 is a high-severity memory corruption vulnerability in Python Pillow, published on 1 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

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.

Weakness: CWE-122

Which versions are affected by CVE-2025-48379?

4 open source packages ship an affected version, including pillow. It affects 1 product.

Products include Python Pillow.

How do I fix CVE-2025-48379?

Upgrade pillow to 11.3.0 or later.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-48379 being exploited?

There is no known exploitation of CVE-2025-48379 in the wild and no public exploit code.

Other vulnerabilities in Python Pillow

• CVE-2014-3007 Pillow command injection Critical 10.0
• CVE-2026-96639 Pillow multi-frame loaders can reuse stale native image storage after mode transitions Critical 9.8
• CVE-2022-30595 Buffer over-flow in Pillow Critical 9.8
• CVE-2021-25289 Out of bounds write in Pillow Critical 9.8
• CVE-2016-4009 Pillow Integer overflow in ImagingResampleHorizontal Critical 9.8

All Python Pillow vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-pillow-2025-48379, CLSA-2026-1772410259, GHSA-xg8h-j46f-w952, PYSEC-2025-61, ROOT-APP-PYPI-CVE-2025-48379, openSUSE-SU-2025:15316-1.