CVE-2026-18495
Full vulnerability record from the local CVENow database.
Description
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.
Severity
MEDIUM
CVSS score
6.1
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-09-11 18:16:56.690000
Last modified
2026-11-05 20:17:52.620000
View original CVE JSON
{
"id": "CVE-2026-18495",
"sourceIdentifier": "[email protected]",
"published": "2026-09-11T18:16:56.690",
"lastModified": "2026-11-05T20:17:52.620",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
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"cpes": [
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],
"versions": [
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}
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{
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{
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{
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{
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{
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{
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{
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"cpes": [
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}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "REQUIRED",
"scope": "UNCHANGED",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"availabilityImpact": "HIGH"
},
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"impactScore": 4.7
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-09-11T17:56:50.884605Z",
"id": "CVE-2026-18495",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
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}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-122"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/errata/RHSA-2026:53467",
"source": "[email protected]"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-18495",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531414",
"source": "[email protected]"
},
{
"url": "https://gitlab.com/libtiff/libtiff/-/merge_requests/729",
"source": "[email protected]"
},
{
"url": "https://gitlab.com/libtiff/libtiff/-/tree/67fd283d276f09db54dc39b9ef7b979d4b45c4b1",
"source": "[email protected]"
}
]
}