Medium
tnef — security advisory
A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when generating numbered backup suffixes for duplicate filenames. When numbered backups are enabled and file overwriting is disabled, an attacker can supply a specially crafted Transport Neutral Encapsulation Format (TNEF) file with an excessive number of colliding attachment filenames, causing the numeric counter to write past the allocated memory buffer. This issue may result in an application crash, leading to a Denial of Service (DoS), or potentially arbitrary code execution.
- Products
- tnef
- Affected versions
- 1.4.12-1.2, 1.4.18-1, 1.4.18-3, 1.4.18-5, 1.4.18-5build1, 1.4.18-6, 1.4.9-1, 1.4.9-1+deb8u2build0.16.04.1, 1.4.9-1+deb8u3build0.16.04.1, 1.4.9-1+deb8u4build0.16.04.1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-103680
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:58 UTC · Revision 1
Source evidence
A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when generating numbered backup suffixes for duplicate filenames. When numbered backups are enabled and file overwriting is disabled, an attacker can supply a specially crafted Transport Neutral Encapsulation Format (TNEF) file with an excessive number of colliding attachment filenames, causing the numeric counter to write past the allocated memory buffer. This issue may result in an application crash, leading to a Denial of Service (DoS), or potentially arbitrary code execution.
osv:UBUNTU-CVE-2026-103680
tnef
Fixed versions: Not specified
tnef
Fixed versions: Not specified
tnef
Fixed versions: Not specified
tnef
Fixed versions: Not specified
tnef
Fixed versions: Not specified
tnef
Fixed versions: Not specified
tnef
Fixed versions: Not specified
Complete source record
{
"id": "05a93e9608fe75e6b0682fdead38e19583ee391b25b1bb627367df12cdd34141",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-103680",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-103680",
"summary": "A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when generating numbered backup suffixes for duplicate filenames. When numbered backups are enabled and file overwriting is disabled, an attacker can supply a specially crafted Transport Neutral Encapsulation Format (TNEF) file with an excessive number of colliding attachment filenames, causing the numeric counter to write past the allocated memory buffer. This issue may result in an application crash, leading to a Denial of Service (DoS), or potentially arbitrary code execution.",
"evidence": "osv:UBUNTU-CVE-2026-103680",
"products": [
{
"name": {
"value": "tnef",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.9-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.9-1+deb8u2build0.16.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.9-1+deb8u3build0.16.04.1",
"evidence": "/affected/0/versions"
},
{
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{
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{
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},
{
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},
{
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"evidence": "/affected/5/versions"
}
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},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/6/versions"
},
{
"value": "1.4.18-5build1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-103680",
"aliases": [
"UBUNTU-CVE-2026-103680"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/tnef?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
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],
"database_specific": {
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"package": {
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},
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"database_specific": {
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{
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},
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],
"database_specific": {
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},
"ecosystem_specific": {
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},
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],
"modified": "2026-10-17T12:57:58.394823871Z",
"provider": "osv",
"upstream": [
"CVE-2026-103680"
],
"references": [
"https://ubuntu.com/security/CVE-2026-103680",
"https://www.cve.org/CVERecord?id=CVE-2026-103680",
"https://bugzilla.redhat.com/show_bug.cgi?id=2544478",
"https://access.redhat.com/security/cve/CVE-2026-103680",
"https://github.com/verdammelt/tnef"
]
},
"related_cves": [
{
"value": "CVE-2026-103680",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 357799,
"published_at": "2026-10-01T12:17:00+00:00"
}