Vulnerability · Published Feb 20, 2026 · Assigned by GitHub_M

CVE-2026-27168SAIL: Heap-based Buffer Overflow in Sail-codecs-xwd

High 8.8

In plain English

A high-severity heap buffer overflow in sail from HappySeaFox. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.4%top 62.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

SAIL is a cross-platform library for loading and saving images with support for animation, metadata, and ICC profiles. All versions are vulnerable to Heap-based Buffer Overflow through the XWD parser's use of the bytes_per_line value. The value os read directly from the file as the read size in io->strict_read(), and is never compared to the actual size of the destination buffer. An attacker can provide an XWD file with an arbitrarily large bytes_per_line, causing a massive write operation beyond the buffer heap allocated for the image pixels. The issue did not have a fix at the time of publication.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	sail	no fix listed	DEBIAN-CVE-2026-27168
Debian:14	sail	no fix listed	DEBIAN-CVE-2026-27168
Ubuntu:24.04:LTS	sail	no fix listed	UBUNTU-CVE-2026-27168
Ubuntu:25.10	sail	no fix listed	UBUNTU-CVE-2026-27168
Ubuntu:26.04:LTS	sail	no fix listed	UBUNTU-CVE-2026-27168
Ubuntu:26.10	sail	no fix listed	UBUNTU-CVE-2026-27168

Affected products (as reported)

Vendor	Product	Versions
HappySeaFox	sail	<= 0.9.10

Weakness: CWE-122 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/HappySeaFox/sail/security/advisories/GHSA-3g38-x2pj-mv55 x_refsource_CONFIRM