Vulnerability-Lookup

CVE-2026-40492 (GCVE-0-2026-40492)

Vulnerability from cvelistv5 – Published: 2026-04-18 01:39 – Updated: 2026-04-20 15:24

Title

SAIL has heap buffer overflow in XWD decoder — bits_per_pixel vs pixmap_depth type confusion in byte-swap

Summary

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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-20 15:24 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8026 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/HappySeaFox/sail/security/advi…	x_refsource_CONFIRM
https://github.com/HappySeaFox/sail/commit/36aa5c…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
HappySeaFox	sail	Affected: < 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-40492

Vulnerability from fkie_nvd - Published: 2026-04-18 03:16 - Updated: 2026-10-26 21:10

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/HappySeaFox/sail/commit/36aa5c7ec8a2bb35f6fb867a1177a6f141156b02
	security-advisories@github.com	https://github.com/HappySeaFox/sail/security/advisories/GHSA-526v-vm72-4v64
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/HappySeaFox/sail/security/advisories/GHSA-526v-vm72-4v64

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    },
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}

UBUNTU-CVE-2026-40492 (CVE-2026-40492)

Vulnerability from osv_ubuntu – Published: 2026-04-18 03:16 – Updated: 2026-11-04 17:08 – Source website

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

URL

Type

	https://ubuntu.com/security/CVE-2026-40492	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-40492	REPORT
	https://github.com/HappySeaFox/sail/security/advi…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "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": "0.9.10-3"
          },
          {
            "binary_name": "libsail-common0t64",
            "binary_version": "0.9.10-3"
          },
          {
            "binary_name": "libsail-manip0t64",
            "binary_version": "0.9.10-3"
          },
          {
            "binary_name": "libsail0t64",
            "binary_version": "0.9.10-3"
          },
          {
            "binary_name": "sail-codecs",
            "binary_version": "0.9.10-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "sail",
        "purl": "pkg:deb/ubuntu/sail@0.9.10-3?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.10-1",
        "0.9.10-3"
      ]
    },
    {
      "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": "2026-11-04T17:08:24Z",
  "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"
  ]
}

Sightings

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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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CVE-2026-40492 (GCVE-0-2026-40492)

FKIE_CVE-2026-40492

UBUNTU-CVE-2026-40492 (CVE-2026-40492)

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