Out-of-bounds Write Affecting sail package, versions <0.9.10-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-SAIL-16104338
- published18 Apr 2026
- disclosed18 Apr 2026
Introduced: 18 Apr 2026
CVE-2026-40492 (opens in a new tab)How to fix?
Upgrade Debian:unstable sail to version 0.9.10-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream sail package and not the sail package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
SAIL is a cross-platform library for loading and saving images with support for animation, metadata, and ICC profiles. Prior to commit 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02, the XWD codec resolves pixel format based on pixmap_depth but the byte-swap code uses bits_per_pixel independently. When pixmap_depth=8 (BPP8_INDEXED, 1 byte/pixel buffer) but bits_per_pixel=32, the byte-swap loop accesses memory as uint32_t*, reading/writing 4x the allocated buffer size. This is a different vulnerability from the previously reported GHSA-3g38-x2pj-mv55 (CVE-2026-27168), which addressed bytes_per_line validation. Commit 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02 contains a patch.