Pillow has an OOB Write with Invalid PSD Tile Extents (Integer Overflow)
Impact
Processing a malicious PSD file could lead to memory corruption, potentially resulting in a crash or arbitrary code execution.
Patches
Patched version: 12.2.0
Pillow 12.1.1 addressed CVE-2026-25990 by adding checks for tile extents in PSD image decoding/encoding to prevent an out-of-bounds write. However, the bounds checks computed tile extent sums using types susceptible to integer overflow, meaning a PSD image with carefully chosen tile dimensions could produce values that wrap around and bypass the checks, still triggering an out-of-bounds write in src/decode.c and src/encode.c. The fix avoids adding extents together before comparison.
Workarounds
Use any version but affected versions: >= 10.3.0, < 12.2.0
Resources
- Fix: https://github.com/python-pillow/Pillow/pull/9520
- Original issue: CVE-2026-25990 (Pillow 12.1.1)
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | pillow | >= 10.3.0, < 12.2.0 | 12.2.0 |
Referencias
- https://github.com/python-pillow/Pillow/releases/tag/12.2.0
- https://github.com/python-pillow/Pillow/commit/58f9a1d166dcb0c274807d4423522d205b0c35ea
- https://github.com/python-pillow/Pillow/pull/9520
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-pwv6-vv43-88gr
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-cfh3-3jmp-rvhc
- https://nvd.nist.gov/vuln/detail/CVE-2026-42311
- https://github.com/python-pillow/Pillow
- Vector CVSS
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N- Debilidad (CWE)
CWE-190, CWE-787- Plataforma
- Python (PyPI)
- Paquete
pillow- Publicada
- 04.05.2026
- Actualizado
- 11.10.2026 15:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-2252 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-pwv6-vv43-88gr - CC BY 4.0
Historial de vulnerabilidades: pillow
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 82
- Primera → última
- 04.2014 10.2026
- Sin corrección
- 0
- Explotada en ataques
- 1
Distribución por gravedad
- Crítica 11
- Alta 53
- Media 16
- Baja 1
- Sin evaluar 1
Divulgaciones por año
- 2017: 1
- 2018: 0
- 2019: 1
- 2020: 10
- 2021: 20
- 2022: 8
- 2023: 3
- 2024: 2
- 2025: 1
- 2026: 24
antes: 12
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