CVE-2026-27809
CRITICAL
GHSA-24p2-j2jr-386w
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
4Description
psd-tools is a Python package for working with Adobe Photoshop PSD files. Prior to version 1.12.2, when a PSD file contains malformed RLE-compressed image data (e.g. a literal run that extends past the expected row size), decode_rle() raises ValueError which propagated all the way to the user, crashing psd.composite() and psd-tools export. decompress() already had a fallback that replaces failed channels with black pixels when result is None, but it never triggered because the ValueError from decode_rle() was not caught. The fix in version 1.12.2 wraps the decode_rle() call in a try/except so the existing fallback handles the error gracefully.
Analysis
Integer overflow in psd-tools Python library before 1.12.2 when processing malformed RLE-compressed PSD files leads to heap overflow. PoC and patch available.
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Remediation
Within 24 hours: Identify all systems and applications using psd-tools library and assess exposure to untrusted PSD file inputs. Within 7 days: Update psd-tools to version 1.12.2 or later across all affected systems and conduct testing to validate functionality. …
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External POC / Exploit Code
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