CVE-2026-40493Public exploitNetwork attack vector

Arbitrary code execution via PSD row overflow

Published Apr 18, 2026 · Updated Apr 18, 2026

Heap buffer overflow in HappySeaFox SAIL before commit c930284445ea3ff94451ccd7a57c999eca3bc979 allows attackers to execute code via PSD files. The sail_codec_load_frame_v8_psd function advances writes by six bytes per pixel while the resolved BPP40_CIE_LAB format allocates five. Processing any three-channel, 16-bit LAB PSD reaches the overflow without malformed pixel data, corrupting heap memory during image decoding.

CVSS severity9.8
Critical
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in HappySeaFox SAIL before commit c930284445ea3ff94451ccd7a57c999eca3bc979 allows attackers to execute code via PSD files. The sail_codec_load_frame_v8_psd function advances writes by six bytes per pixel while the resolved BPP40_CIE_LAB format allocates five. Processing any three-channel, 16-bit LAB PSD reaches the overflow without malformed pixel data, corrupting heap memory during image decoding.

The record

CVE
CVE-2026-40493
Published
Apr 18, 2026
Updated
Apr 18, 2026
Vendor
HappySeaFox
Product
SAIL
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 18, 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=< c930284445ea3ff94451ccd7a57c999eca3bc979

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HappySeaFox · SAILversion=< c930284445ea3ff94451ccd7a57c999eca3bc979

Published CVSS scores

9.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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 exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

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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