MediumFix available
libsixel, libstb — security advisory
In Libsixel prior to and including v1.10.3, a NULL pointer dereference in the stb_image.h component of libsixel allows attackers to cause a denial of service (DOS) via a crafted PICT file.
- Products
- libsixel, libstb
- Affected versions
- 0.0~git20220908.8b5f1f3+ds-1, 0.0~git20230129.5736b15+ds-1, 0.0~git20230129.5736b15+ds-1.1, 0.0~git20230129.5736b15+ds-1.1~exp1, 0.0~git20230129.5736b15+ds-1.2, 0.0~git20240715.f7f20f39fe4f+ds-1, 0.0~git20241109.5c20573+ds-1, 0.0~git20250907.fede005+ds-1, 1.10.3-3, 1.10.5-1, 1:1.8.7-1, 1:1.8.7-2, 1:1.8.7-3, 1:1.8.7-4, 1:1.8.7-5, 1:1.8.7-6, 1:1.8.7-r2-1
- Fixed versions
- 1.10.5-1
- CVEs
- CVE-2021-45340
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:54 UTC · Revision 1
Source evidence
In Libsixel prior to and including v1.10.3, a NULL pointer dereference in the stb_image.h component of libsixel allows attackers to cause a denial of service (DOS) via a crafted PICT file.
osv:DEBIAN-CVE-2021-45340
libsixel
Fixed versions: Not specified
libsixel
Fixed versions: 1.10.5-1
libsixel
Fixed versions: 1.10.5-1
libstb
Fixed versions: Not specified
libstb
Fixed versions: Not specified
libstb
Fixed versions: Not specified
Complete source record
{
"id": "1d22e8041c404fb19d555d69ff55936f655d777aa5e1fae9d4f579c78de81312",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-45340",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2021-45340",
"summary": "In Libsixel prior to and including v1.10.3, a NULL pointer dereference in the stb_image.h component of libsixel allows attackers to cause a denial of service (DOS) via a crafted PICT file.",
"evidence": "osv:DEBIAN-CVE-2021-45340",
"products": [
{
"name": {
"value": "libsixel",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.10.3-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.10.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.8.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.8.7-2",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.8.7-3",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.8.7-4",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.8.7-5",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.8.7-6",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.8.7-r2-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libsixel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.10.5-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libsixel",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.10.5-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libstb",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20220908.8b5f1f3+ds-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.0~git20230129.5736b15+ds-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.0~git20230129.5736b15+ds-1.1",
"evidence": "/affected/3/versions"
},
{
"value": "0.0~git20230129.5736b15+ds-1.1~exp1",
"evidence": "/affected/3/versions"
},
{
"value": "0.0~git20230129.5736b15+ds-1.2",
"evidence": "/affected/3/versions"
},
{
"value": "0.0~git20240715.f7f20f39fe4f+ds-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.0~git20241109.5c20573+ds-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.0~git20250907.fede005+ds-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "libstb",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20241109.5c20573+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "0.0~git20250907.fede005+ds-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "libstb",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20241109.5c20573+ds-1",
"evidence": "/affected/5/versions"
},
{
"value": "0.0~git20250907.fede005+ds-1",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2021-45340",
"aliases": [
"DEBIAN-CVE-2021-45340"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libsixel",
"purl": "pkg:deb/debian/libsixel?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.10.3-3",
"1.10.5-1",
"1:1.8.7-1",
"1:1.8.7-2",
"1:1.8.7-3",
"1:1.8.7-4",
"1:1.8.7-5",
"1:1.8.7-6",
"1:1.8.7-r2-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-45340.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.10.5-1"
}
]
}
],
"package": {
"name": "libsixel",
"purl": "pkg:deb/debian/libsixel?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-45340.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.10.5-1"
}
]
}
],
"package": {
"name": "libsixel",
"purl": "pkg:deb/debian/libsixel?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-45340.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libstb",
"purl": "pkg:deb/debian/libstb?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.0~git20220908.8b5f1f3+ds-1",
"0.0~git20230129.5736b15+ds-1",
"0.0~git20230129.5736b15+ds-1.1",
"0.0~git20230129.5736b15+ds-1.1~exp1",
"0.0~git20230129.5736b15+ds-1.2",
"0.0~git20240715.f7f20f39fe4f+ds-1",
"0.0~git20241109.5c20573+ds-1",
"0.0~git20250907.fede005+ds-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-45340.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libstb",
"purl": "pkg:deb/debian/libstb?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.0~git20241109.5c20573+ds-1",
"0.0~git20250907.fede005+ds-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-45340.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libstb",
"purl": "pkg:deb/debian/libstb?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.0~git20241109.5c20573+ds-1",
"0.0~git20250907.fede005+ds-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-45340.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T18:00:21.805249770Z",
"provider": "osv",
"upstream": [
"CVE-2021-45340"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2021-45340"
]
},
"related_cves": [
{
"value": "CVE-2021-45340",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 419372,
"published_at": "2022-01-25T12:15:07.643+00:00"
}