Memory Mismanagement in SAIL Image Loading Library
CVE-2026-40492

9.8CRITICAL

Key Information:

Vendor

Happyseafox

Status
Sail
Vendor
CVE Published:
18 April 2026

What is CVE-2026-40492?

SAIL is an image loading library that encounters a memory mismanagement issue within its XWD codec. The vulnerability arises when the codec resolves pixel formats based on pixmap_depth, while incorrectly applying byte-swapping logic using bits_per_pixel. This discrepancy can lead to unauthorized access to memory, resulting in buffer overflows and potential data corruption. The issue was addressed in commit 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02, which includes a fix to enhance the security and robustness of the library.

Affected Version(s)

sail < 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02

References

https://github.com/HappySeaFox/sail/security/advisories/G...
x_refsource_CONFIRM
https://github.com/HappySeaFox/sail/commit/36aa5c7ec8a2bb...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.