high7.1
CVE-2025-48379
Pillow vulnerability can cause write buffer overflow on BCn encoding
Impact
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. * Unclear how large the potential write could be. It is likely limited by process segfault, so it's not necessarily deterministic. It may be practically unbounded. * Unclear if there's a restriction on the bytes that could be emitted. It's likely that the only restriction is that the bytes would be emitted in chunks of 8 or 16. This was introduced in Pillow 11.2.0 when the feature was added.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pillow | >= 11.2.0, < 11.3.0 | 11.3.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Python | Pillow | Version 11.2.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/python-pillow/Pillow/commit/ef98b3510e3e4f14b547762764813d7e5ca3c5a4
- https://github.com/python-pillow/Pillow/pull/9041
- https://github.com/python-pillow/Pillow/releases/tag/11.3.0
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-xg8h-j46f-w952
- https://github.com/advisories/GHSA-xg8h-j46f-w952
- https://nvd.nist.gov/vuln/detail/CVE-2025-48379
- https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2025-61.yaml