Use After Free Affecting pillow package, versions [11.3.0,12.3.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-PILLOW-21277800
- published20 Oct 2026
- disclosed19 Oct 2026
- creditJoshua Rogers
Introduced: 19 Oct 2026
NewCVE-2026-112396 (opens in a new tab)How to fix?
Upgrade pillow to version 12.3.0 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free via ImagingLibTiffEncode in src/libImaging/TiffDecode.c when a libtiff encode error occurs. The cleanup logic in the error path frees or closes TIFF resources (calling TIFFCleanup/TIFFClose or free(clientstate->data)) without nulling the corresponding pointers, while the dedicated cleanup function ImagingLibTiffEncodeCleanup subsequently operates on those already-freed resources. An attacker who can trigger a TIFF encode error can exploit this use-after-free condition to crash the process.