CVE-2026-40492 | THREATINT

Description

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.

PUBLISHED Reserved 2026-04-13 | Published 2026-04-18 | Updated 2026-04-20 | Assigner GitHub_M

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

CWE-787: Out-of-bounds Write

Product status

< 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02

affected

References

github.com/...x/sail/security/advisories/GHSA-526v-vm72-4v64 exploit

github.com/...x/sail/security/advisories/GHSA-526v-vm72-4v64

github.com/...ommit/36aa5c7ec8a2bb35f6fb867a1177a6f141156b02

cve.org (CVE-2026-40492)

nvd.nist.gov (CVE-2026-40492)

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