UBUNTU-CVE-2026-40492

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Source
https://ubuntu.com/security/CVE-2026-40492
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40492.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-40492
Upstream
  • CVE-2026-40492
Published
2026-04-18T03:16:00Z
Modified
2026-05-20T16:25:39.886568911Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:24.04:LTS / sail

Package

Name
sail
Purl
pkg:deb/ubuntu/sail?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.9.0+repack-1
0.9.0+repack-2
0.9.0+repack-2.1
0.9.0+repack-2.1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.9.0+repack-2.1build1",
            "binary_name": "libsail-c++0t64"
        },
        {
            "binary_version": "0.9.0+repack-2.1build1",
            "binary_name": "libsail-common0t64"
        },
        {
            "binary_version": "0.9.0+repack-2.1build1",
            "binary_name": "libsail-manip0t64"
        },
        {
            "binary_version": "0.9.0+repack-2.1build1",
            "binary_name": "libsail0t64"
        },
        {
            "binary_version": "0.9.0+repack-2.1build1",
            "binary_name": "sail-codecs"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40492.json"

Ubuntu:25.10 / sail

Package

Name
sail
Purl
pkg:deb/ubuntu/sail?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.9.7-1build1
0.9.8-1
0.9.9-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.9.9-1",
            "binary_name": "libsail-c++0t64"
        },
        {
            "binary_version": "0.9.9-1",
            "binary_name": "libsail-common0t64"
        },
        {
            "binary_version": "0.9.9-1",
            "binary_name": "libsail-manip0t64"
        },
        {
            "binary_version": "0.9.9-1",
            "binary_name": "libsail0t64"
        },
        {
            "binary_version": "0.9.9-1",
            "binary_name": "sail-codecs"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40492.json"

Ubuntu:26.04:LTS / sail

Package

Name
sail
Purl
pkg:deb/ubuntu/sail?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.9.9-1
0.9.10-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.9.10-1",
            "binary_name": "libsail-c++0t64"
        },
        {
            "binary_version": "0.9.10-1",
            "binary_name": "libsail-common0t64"
        },
        {
            "binary_version": "0.9.10-1",
            "binary_name": "libsail-manip0t64"
        },
        {
            "binary_version": "0.9.10-1",
            "binary_name": "libsail0t64"
        },
        {
            "binary_version": "0.9.10-1",
            "binary_name": "sail-codecs"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40492.json"