Critical
sail — security advisory
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.
- Products
- sail
- Affected versions
- 0.9.0+repack-1, 0.9.0+repack-2, 0.9.0+repack-2.1, 0.9.0+repack-2.1build1, 0.9.10-1, 0.9.10-3, 0.9.7-1build1, 0.9.8-1, 0.9.9-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-40493
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:43 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-40493
sail
Fixed versions: Not specified
sail
Fixed versions: Not specified
sail
Fixed versions: Not specified
sail
Fixed versions: Not specified
Complete source record
{
"id": "0b359f1fbb8c3210819b23c3708f111cf60909069ab5aee4c21776af7fd356b9",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-40493",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-40493",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-40493",
"products": [
{
"name": {
"value": "sail",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.0+repack-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.9.0+repack-2",
"evidence": "/affected/0/versions"
},
{
"value": "0.9.0+repack-2.1",
"evidence": "/affected/0/versions"
},
{
"value": "0.9.0+repack-2.1build1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "sail",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.7-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "0.9.8-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.9.9-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "sail",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.10-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.10-3",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "sail",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.9.9-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.10-1",
"evidence": "/affected/3/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-40493",
"aliases": [
"UBUNTU-CVE-2026-40493"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "sail",
"purl": "pkg:deb/ubuntu/sail?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.9.0+repack-1",
"0.9.0+repack-2",
"0.9.0+repack-2.1",
"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"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "sail",
"purl": "pkg:deb/ubuntu/sail?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"0.9.7-1build1",
"0.9.8-1",
"0.9.9-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40493.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "sail",
"purl": "pkg:deb/ubuntu/sail?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"0.9.10-1",
"0.9.10-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40493.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "sail",
"purl": "pkg:deb/ubuntu/sail?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"0.9.9-1",
"0.9.10-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40493.json"
},
"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"
}
]
}
}
],
"modified": "2026-10-17T12:58:52.838583059Z",
"provider": "osv",
"upstream": [
"CVE-2026-40493"
],
"references": [
"https://ubuntu.com/security/CVE-2026-40493",
"https://www.cve.org/CVERecord?id=CVE-2026-40493",
"https://github.com/HappySeaFox/sail/security/advisories/GHSA-rcqx-gc76-r9mv"
]
},
"related_cves": [
{
"value": "CVE-2026-40493",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359129,
"published_at": "2026-04-18T03:16:00+00:00"
}