CVE-2026-112403 ยท GHSA-8g5g-8vmr-9782
Pillow: Heap buffer overflow in ImagingJpegDecode
- Risk score
- 70/100
- CVSS
- 9.2 v4.0
- Exploit chance (30 days)
- 0.3%
- Published
- 19 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Pillow's JPEG decoder has a heap buffer overflow vulnerability in ImagingJpegDecode, which can be exploited by an attacker to corrupt heap memory, crash the process, or potentially allow code execution.
- Affected
- {'products': ['Pillow'], 'packages': ['Pillow'], 'versions': ['<= 12.3.0']}
- Fix
- Upgrade to version 13.0.0
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 9.2 critical
- Remotely exploitable without logging in
- On your watchlist: PyPI
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| Pillow | pip | <= 12.3.0 | 13.0.0 |
References
- https://github.com/advisories/GHSA-8g5g-8vmr-9782
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8g5g-8vmr-9782
- https://nvd.nist.gov/vuln/detail/CVE-2026-112403
- https://github.com/python-pillow/Pillow/commit/242a059aedc1935097d9aa1dc3f099750467ba75
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0
- https://github.com/advisories/GHSA-8g5g-8vmr-9782
Original description
Pillow is a Python imaging library. Prior to 13.0.0, Pillow's JPEG decoder can write a full-width scanline into a buffer sized for a requested draft scale. ImagingJpegDecode does not verify libjpeg's actual output width and component count after scaling is requested, and an 8-bit lossless SOF3 JPEG decoded by a build linked to libjpeg-turbo 3.x can ignore the requested downscaling geometry. An attacker can supply such a JPEG to an application that uses draft() or thumbnail() to request downscaling. This can corrupt heap memory, crash the process, or potentially allow code execution. Older libjpeg-turbo 2.x and IJG builds reject the SOF3 input. This issue is fixed in version 13.0.0.
Last activity 19 Oct 2026. Patch Forecast updates every hour.