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Vulnerability Details :

CVE-2026-27809

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-25 Feb, 2026 | 23:57
Updated At-26 Feb, 2026 | 15:17
Rejected At-
Credits

psd-tools: Compression module has unguarded zlib decompression, missing dimension validation, and hardening gaps

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.

Vendors
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Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:25 Feb, 2026 | 23:57
Updated At:26 Feb, 2026 | 15:17
Rejected At:
▼CVE Numbering Authority (CNA)
psd-tools: Compression module has unguarded zlib decompression, missing dimension validation, and hardening gaps

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 Products
Vendor
psd-tools
Product
psd-tools
Versions
Affected
  • < 1.12.2
Problem Types
TypeCWE IDDescription
CWECWE-409CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
CWECWE-789CWE-789: Memory Allocation with Excessive Size Value
CWECWE-617CWE-617: Reachable Assertion
CWECWE-190CWE-190: Integer Overflow or Wraparound
CWECWE-755CWE-755: Improper Handling of Exceptional Conditions
CWECWE-704CWE-704: Incorrect Type Conversion or Cast
Type: CWE
CWE ID: CWE-409
Description: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
Type: CWE
CWE ID: CWE-789
Description: CWE-789: Memory Allocation with Excessive Size Value
Type: CWE
CWE ID: CWE-617
Description: CWE-617: Reachable Assertion
Type: CWE
CWE ID: CWE-190
Description: CWE-190: Integer Overflow or Wraparound
Type: CWE
CWE ID: CWE-755
Description: CWE-755: Improper Handling of Exceptional Conditions
Type: CWE
CWE ID: CWE-704
Description: CWE-704: Incorrect Type Conversion or Cast
Metrics
VersionBase scoreBase severityVector
4.06.8MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
Version: 4.0
Base score: 6.8
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/psd-tools/psd-tools/security/advisories/GHSA-24p2-j2jr-386w
x_refsource_CONFIRM
https://github.com/psd-tools/psd-tools/commit/6c0a78f195b5942757886a1863793fd5946c1fb1
x_refsource_MISC
https://github.com/psd-tools/psd-tools/releases/tag/v1.12.2
x_refsource_MISC
Hyperlink: https://github.com/psd-tools/psd-tools/security/advisories/GHSA-24p2-j2jr-386w
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/psd-tools/psd-tools/commit/6c0a78f195b5942757886a1863793fd5946c1fb1
Resource:
x_refsource_MISC
Hyperlink: https://github.com/psd-tools/psd-tools/releases/tag/v1.12.2
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:26 Feb, 2026 | 00:16
Updated At:27 Feb, 2026 | 14:06

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.06.8MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 6.8
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-190Primarysecurity-advisories@github.com
CWE-409Primarysecurity-advisories@github.com
CWE-617Primarysecurity-advisories@github.com
CWE-704Primarysecurity-advisories@github.com
CWE-755Primarysecurity-advisories@github.com
CWE-789Primarysecurity-advisories@github.com
CWE ID: CWE-190
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-409
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-617
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-704
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-755
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-789
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/psd-tools/psd-tools/commit/6c0a78f195b5942757886a1863793fd5946c1fb1security-advisories@github.com
N/A
https://github.com/psd-tools/psd-tools/releases/tag/v1.12.2security-advisories@github.com
N/A
https://github.com/psd-tools/psd-tools/security/advisories/GHSA-24p2-j2jr-386wsecurity-advisories@github.com
N/A
Hyperlink: https://github.com/psd-tools/psd-tools/commit/6c0a78f195b5942757886a1863793fd5946c1fb1
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/psd-tools/psd-tools/releases/tag/v1.12.2
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/psd-tools/psd-tools/security/advisories/GHSA-24p2-j2jr-386w
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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