SB2026110369 - Fedora 44 update for python-pillow

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Main Vulnerability Database SB2026110369

SB2026110369 - Fedora 44 update for python-pillow

Published: November 3, 2026

Security Bulletin ID SB2026110369
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap-based buffer overflow (CVE-ID: CVE-2026-112393)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service and potentially execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow in Pillow's _tiffWriteProc function in src/libImaging/TiffDecode.c when saving a TIFF image through libtiff to a destination without a usable file descriptor, such as io.BytesIO. A remote attacker can supply a crafted single-band TIFF with an attacker-controlled out-of-line tag value to a service that opens and re-saves the image to trigger an undersized allocation and overwrite adjacent heap memory, causing a process crash or potentially executing arbitrary code.

The reported code-execution chain additionally requires addresses disclosed by a separate vulnerability.


Remediation

Install update from vendor's website.

References