CVE-2026-27809

Summary

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.

Affected Software

VendorProductVersion RangeStatus
psd-toolspsd-tools< 1.12.2affected

Weaknesses

  • CWE-409: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
  • CWE-789: CWE-789: Memory Allocation with Excessive Size Value
  • CWE-617: CWE-617: Reachable Assertion
  • CWE-190: CWE-190: Integer Overflow or Wraparound
  • CWE-755: CWE-755: Improper Handling of Exceptional Conditions
  • CWE-704: CWE-704: Incorrect Type Conversion or Cast

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: total

References