HappySeaFox sail up to 0.9.10 XWD Parser strict_read heap-based overflow

Summaryinfo

A vulnerability was found in HappySeaFox sail up to 0.9.10. It has been declared as critical. This affects the function strict_read of the component XWD Parser. Such manipulation leads to heap-based overflow. This vulnerability is traded as CVE-2026-27168. Access to the local network is required for this attack to succeed. There is no exploit available.

Detailsinfo

A vulnerability was found in HappySeaFox sail up to 0.9.10 and classified as critical. Affected by this issue is the function strict_read of the component XWD Parser. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-27168 since 02/18/2026. The exploitation is known to be easy. Access to the local network is required for this attack to succeed. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/02/2026).

The vulnerability scanner Nessus provides a plugin with the ID 299722 (Linux Distros Unpatched Vulnerability : CVE-2026-27168), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (299722). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• HappySeaFox

Name

• sail

Version

• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5
• 0.9.6
• 0.9.7
• 0.9.8
• 0.9.9
• 0.9.10

Website

• Product: https://github.com/HappySeaFox/sail/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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