RHSA-2026:98111 - Security Advisory

Topic

An update for python-pillow is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.

Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• pillow: Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO (CVE-2026-112393)
• pillow: Pillow: Denial of Service via unbounded recursion in PDF parser (CVE-2026-112391)
• pillow: pillow: Denial of service via double free during image transformation (CVE-2026-112402)
• pillow: pillow: Denial of Service via zero-size images in rank filters (CVE-2026-112392)
• pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution (CVE-2026-112398)
• pillow: pillow: Denial of Service via out-of-bounds memory access on zero-width images (CVE-2026-112397)
• pillow: Pillow: Denial of Service via null pointer dereference in Image.merge() (CVE-2026-112405)
• pillow: pillow: Denial of Service via crafted multi-frame image conversion (CVE-2026-112894)
• pillow: pillow: Denial of service via crafted PDF during append operations (CVE-2026-112895)
• pillow: Pillow: Argument Injection in Ghostscript call, potentially leading into RCE (CVE-2026-112900)
• pillow: pillow: Denial of Service via infinite loop during PDF page rewriting (CVE-2026-112406)
• pillow: pillow: Denial of Service via duplicate page references in PDF files (CVE-2026-96640)
• pillow: pillow: Denial of Service via unbounded memory expansion in MSP image decoder (CVE-2026-112892)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64

Fixes

• BZ - 2555846 - CVE-2026-112393 pillow: Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO
• BZ - 2555851 - CVE-2026-112391 pillow: Pillow: Denial of Service via unbounded recursion in PDF parser
• BZ - 2555859 - CVE-2026-112402 pillow: pillow: Denial of service via double free during image transformation
• BZ - 2555866 - CVE-2026-112392 pillow: pillow: Denial of Service via zero-size images in rank filters
• BZ - 2555867 - CVE-2026-112398 pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution
• BZ - 2555868 - CVE-2026-112397 pillow: pillow: Denial of Service via out-of-bounds memory access on zero-width images
• BZ - 2555873 - CVE-2026-112405 pillow: Pillow: Denial of Service via null pointer dereference in Image.merge()
• BZ - 2555875 - CVE-2026-112894 pillow: pillow: Denial of Service via crafted multi-frame image conversion
• BZ - 2555879 - CVE-2026-112895 pillow: pillow: Denial of service via crafted PDF during append operations
• BZ - 2555889 - CVE-2026-112900 pillow: Pillow: Argument Injection in Ghostscript call, potentially leading into RCE
• BZ - 2556322 - CVE-2026-112406 pillow: pillow: Denial of Service via infinite loop during PDF page rewriting
• BZ - 2558576 - CVE-2026-96640 pillow: pillow: Denial of Service via duplicate page references in PDF files
• BZ - 2559393 - CVE-2026-112892 pillow: pillow: Denial of Service via unbounded memory expansion in MSP image decoder

CVEs

• CVE-2026-96640
• CVE-2026-112391
• CVE-2026-112392
• CVE-2026-112393
• CVE-2026-112397
• CVE-2026-112398
• CVE-2026-112402
• CVE-2026-112405
• CVE-2026-112406
• CVE-2026-112892
• CVE-2026-112894
• CVE-2026-112895
• CVE-2026-112900

References

• https://access.redhat.com/security/updates/classification/#critical