Python
CVE-2026-27809
CRITICAL
GHSA-24p2-j2jr-386w
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
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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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | PSD file with malformed RLE-compressed image data where literal run extends past expected row size. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 9.1. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Attacker uploads crafted PSD file that triggers integer overflow during RLE decompression, causing heap corruption. |
| Remediation | Update psd-tools to 1.12.2. Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all systems and applications using psd-tools library and assess exposure to untrusted PSD file inputs. …
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