UBUNTU-CVE-2026-40493

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Source
https://ubuntu.com/security/CVE-2026-40493
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40493.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-40493
Upstream
  • CVE-2026-40493
Published
2026-04-18T03:16:00Z
Modified
2026-05-20T16:25:39.568142104Z
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 c930284445ea3ff94451ccd7a57c999eca3bc979, the PSD codec computes bytes-per-pixel (bpp) from raw header fields channels * depth, but the pixel buffer is allocated based on the resolved pixel format. For LAB mode with channels=3, depth=16, bpp = (3*16+7)/8 = 6, but the format BPP40_CIE_LAB allocates only 5 bytes per pixel. Every pixel write overshoots, causing a deterministic heap buffer overflow on every row. Commit c930284445ea3ff94451ccd7a57c999eca3bc979 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_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",
            "binary_version": "0.9.0+repack-2.1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40493.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_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",
            "binary_version": "0.9.9-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40493.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_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",
            "binary_version": "0.9.10-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40493.json"