MediumFix available
tiff — security advisory
A flaw was found in libtiff. A heap-buffer overflow vulnerability exists in the `tiff2pdf` utility due to an integer truncation error when processing crafted BigTIFF files. An attacker can provide a specially crafted BigTIFF file, causing a 64-bit `StripByteCounts` value to be truncated to a 32-bit integer. This leads to an undersized memory allocation and a subsequent out-of-bounds memory copy, resulting in a crash and severe memory corruption.
- Products
- tiff
- Affected versions
- 4.5.0-6, 4.5.0-6+deb12u1, 4.5.0-6+deb12u2, 4.5.0-6+deb12u3, 4.5.0-6+deb12u4, 4.5.1+git230720-1, 4.5.1+git230720-2, 4.5.1+git230720-3, 4.5.1+git230720-4, 4.5.1+git230720-5, 4.5.1-1, 4.5.1~rc3-1, 4.6.0-1, 4.6.0-2, 4.7.0-1, 4.7.0-2, 4.7.0-3, 4.7.0-3+deb13u1, 4.7.0-3+deb13u2, 4.7.0-3+deb13u3, 4.7.0-4, 4.7.0-5, 4.7.1-1, 4.7.1-2, 4.7.1-3, 4.7.2-1
- Fixed versions
- 4.7.1-1
- CVEs
- CVE-2026-18495
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 09:02 UTC · Revision 1
Source evidence
A flaw was found in libtiff. A heap-buffer overflow vulnerability exists in the `tiff2pdf` utility due to an integer truncation error when processing crafted BigTIFF files. An attacker can provide a specially crafted BigTIFF file, causing a 64-bit `StripByteCounts` value to be truncated to a 32-bit integer. This leads to an undersized memory allocation and a subsequent out-of-bounds memory copy, resulting in a crash and severe memory corruption.
osv:DEBIAN-CVE-2026-18495
tiff
Fixed versions: Not specified
tiff
Fixed versions: Not specified
tiff
Fixed versions: 4.7.1-1
Complete source record
{
"id": "42412b817c03c1aff88dc11e897c6b28d9594dd0e2cbeee0560c4e06ac67eea8",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-18495",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-18495",
"summary": "A flaw was found in libtiff. A heap-buffer overflow vulnerability exists in the `tiff2pdf` utility due to an integer truncation error when processing crafted BigTIFF files. An attacker can provide a specially crafted BigTIFF file, causing a 64-bit `StripByteCounts` value to be truncated to a 32-bit integer. This leads to an undersized memory allocation and a subsequent out-of-bounds memory copy, resulting in a crash and severe memory corruption.",
"evidence": "osv:DEBIAN-CVE-2026-18495",
"products": [
{
"name": {
"value": "tiff",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.5.0-6",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.0-6+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.0-6+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.0-6+deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.0-6+deb12u4",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.1+git230720-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.1+git230720-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.1+git230720-3",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.1+git230720-4",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.1+git230720-5",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.1~rc3-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.6.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.0-5",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.1-3",
"evidence": "/affected/0/versions"
},
{
"value": "4.7.2-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "tiff",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.7.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "4.7.0-3+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "4.7.0-3+deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "4.7.0-3+deb13u3",
"evidence": "/affected/1/versions"
},
{
"value": "4.7.0-4",
"evidence": "/affected/1/versions"
},
{
"value": "4.7.0-5",
"evidence": "/affected/1/versions"
},
{
"value": "4.7.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.7.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.7.1-3",
"evidence": "/affected/1/versions"
},
{
"value": "4.7.2-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "tiff",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.7.1-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "4.7.0-3",
"evidence": "/affected/2/versions"
},
{
"value": "4.7.0-4",
"evidence": "/affected/2/versions"
},
{
"value": "4.7.0-5",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-18495",
"aliases": [
"DEBIAN-CVE-2026-18495"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tiff",
"purl": "pkg:deb/debian/tiff?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"4.5.0-6",
"4.5.0-6+deb12u1",
"4.5.0-6+deb12u2",
"4.5.0-6+deb12u3",
"4.5.0-6+deb12u4",
"4.5.1+git230720-1",
"4.5.1+git230720-2",
"4.5.1+git230720-3",
"4.5.1+git230720-4",
"4.5.1+git230720-5",
"4.5.1-1",
"4.5.1~rc3-1",
"4.6.0-1",
"4.6.0-2",
"4.7.0-1",
"4.7.0-2",
"4.7.0-3",
"4.7.0-4",
"4.7.0-5",
"4.7.1-1",
"4.7.1-2",
"4.7.1-3",
"4.7.2-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18495.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "tiff",
"purl": "pkg:deb/debian/tiff?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.7.0-3",
"4.7.0-3+deb13u1",
"4.7.0-3+deb13u2",
"4.7.0-3+deb13u3",
"4.7.0-4",
"4.7.0-5",
"4.7.1-1",
"4.7.1-2",
"4.7.1-3",
"4.7.2-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18495.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.7.1-1"
}
]
}
],
"package": {
"name": "tiff",
"purl": "pkg:deb/debian/tiff?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.7.0-3",
"4.7.0-4",
"4.7.0-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18495.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-08T09:47:25.442211275Z",
"provider": "osv",
"upstream": [
"CVE-2026-18495"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-18495"
]
},
"related_cves": [
{
"value": "CVE-2026-18495",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 98857,
"published_at": "2026-09-11T18:16:56.69+00:00"
}