PT-2026-37200 · Pypi+2 · Pillow+2

Ethankim88 · CVE-2026-42311 · Published 2026-05-04 · Updated 2026-07-13

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Pillow versions 10.3.0 through 12.1.x

Description Processing a malicious PSD file can lead to memory corruption, potentially resulting in a crash or arbitrary code execution. This occurs because bounds checks for tile extents in PSD image decoding and encoding used types susceptible to integer overflow. A PSD image with specifically crafted tile dimensions could cause values to wrap around, bypassing the checks and triggering an out-of-bounds write in the src/decode.c and src/encode.c files.

Recommendations Update to version 12.2.0.

Exploit

Fix

Memory Corruption

Integer Overflow

Weakness Enumeration

CWE-787

CWE-190

Related Identifiers

BIT-PILLOW-2026-42311

CLEANSTART-2026-EN66750

CLEANSTART-2026-FG72002

CLEANSTART-2026-RF67070

CVE-2026-42311

ECHO-4895-DA6A-8B1F

GHSA-PWV6-VV43-88GR

OESA-2026-2428

OESA-2026-2429

OPENSUSE-SU-2026:11261-1

OPENSUSE-SU-2026:21296-1

PYSEC-2026-2252

SUSE-SU-2026:22626-1

USN-8399-1

Affected Products

Linuxmint

Pillow

Ubuntu

References · 98

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42311.json · Exploit
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-pwv6-vv43-88gr · Vendor Advisory
• https://github.com/python-pillow/Pillow/commit/58f9a1d166dcb0c274807d4423522d205b0c35ea · Patch
• https://github.com/python-pillow/Pillow/pull/9520 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-40192 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-45409 · Security Note
• https://ubuntu.com/security/notices/USN-8399-1 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-APP-PYPI-CVE-2026-42311 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-pillow-2026-42311 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-42311 · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2026-2252 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42311 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-48524 · Security Note
• https://osv.dev/vulnerability/GHSA-pwv6-vv43-88gr · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2429 · Vendor Advisory