ubuntu-cve-2026-40492
Vulnerability from osv_ubuntu
Published
2026-04-18 03:16
Modified
2026-05-20 15:27
Summary
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.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "sail",
        "purl": "pkg:deb/ubuntu/sail@0.9.0+repack-2.1build1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "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": "0.9.9-1"
          },
          {
            "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "sail",
        "purl": "pkg:deb/ubuntu/sail@0.9.9-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.7-1build1",
        "0.9.8-1",
        "0.9.9-1"
      ]
    },
    {
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "sail",
        "purl": "pkg:deb/ubuntu/sail@0.9.10-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.9-1",
        "0.9.10-1"
      ]
    }
  ],
  "aliases": [],
  "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.",
  "id": "UBUNTU-CVE-2026-40492",
  "modified": "2026-05-20T15:27:26Z",
  "published": "2026-04-18T03:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-40492"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-40492"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/HappySeaFox/sail/security/advisories/GHSA-526v-vm72-4v64"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-40492"
  ]
}



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