CVE-2026-27168Public exploit

Code execution via unchecked XWD scanline length

Published Feb 20, 2026 · Updated Feb 20, 2026

Heap-based buffer overflow in SAIL 0.9.10 and earlier allows attackers to execute code by supplying a crafted XWD image. In xwd_private_read_pixels(), io->strict_read() copies the file-controlled bytes_per_line count into each heap scanline without comparing it with the allocated image row size. The crafted file must reach the XWD decoder; no authentication is required, and successful corruption can redirect execution in the consuming process.

CVSS severity8.8
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in SAIL 0.9.10 and earlier allows attackers to execute code by supplying a crafted XWD image. In xwd_private_read_pixels(), io->strict_read() copies the file-controlled bytes_per_line count into each heap scanline without comparing it with the allocated image row size. The crafted file must reach the XWD decoder; no authentication is required, and successful corruption can redirect execution in the consuming process.

The record

CVE
CVE-2026-27168
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
HappySeaFox
Product
SAIL
Classifications
CWE-122, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 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=<= 0.9.10

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

HappySeaFox · SAILversion=<= 0.9.10

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS: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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
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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