CVE-2026-27809Network attack vector

Denial of service via unsafe decompression

Published Feb 25, 2026 · Updated Feb 26, 2026

Denial of service in psd_tools.compression before 1.12.2 allows remote attackers to crash processing via crafted PSD or PSB files. The module calls zlib.decompress without an output cap and derives allocations from unchecked dimensions, while decoder exceptions escape instead of reaching its fallback. Exploitation requires an application to process attacker-supplied content and can exhaust memory, terminate the process, or silently replace failed channels with black pixels.

CVSS severity9.1
Critical
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in psd_tools.compression before 1.12.2 allows remote attackers to crash processing via crafted PSD or PSB files. The module calls zlib.decompress without an output cap and derives allocations from unchecked dimensions, while decoder exceptions escape instead of reaching its fallback. Exploitation requires an application to process attacker-supplied content and can exhaust memory, terminate the process, or silently replace failed channels with black pixels.

The record

CVE
CVE-2026-27809
Published
Feb 25, 2026
Updated
Feb 26, 2026
Vendor
psd-tools
Product
psd-tools
Classifications
CWE-789, CWE-190, CWE-409, CWE-755, CWE-617, CWE-704, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.12.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

psd-tools · psd-toolsversion=< 1.12.2

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
6.8GitHubCVSS: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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
CWE-190Integer Overflow or Wraparound
CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
CWE-755Improper Handling of Exceptional Conditions
CWE-617Reachable Assertion
CWE-704Incorrect Type Conversion or Cast
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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