Low
popt — security advisory
An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.
- Products
- popt
- Affected versions
- 1.16-10, 1.16-11, 1.16-12, 1.16-14, 1.16-7ubuntu3, 1.16-8, 1.16-8ubuntu1, 1.18-2build2, 1.18-2build3, 1.18-3, 1.18-3build1, 1.19+dfsg-1, 1.19+dfsg-1build1, 1.19+dfsg-2, 1.19+dfsg-2build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-18839
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:55 UTC · Revision 1
Source evidence
An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.
osv:UBUNTU-CVE-2026-18839
popt
Fixed versions: Not specified
popt
Fixed versions: Not specified
popt
Fixed versions: Not specified
popt
Fixed versions: Not specified
popt
Fixed versions: Not specified
popt
Fixed versions: Not specified
popt
Fixed versions: Not specified
popt
Fixed versions: Not specified
Complete source record
{
"id": "c94c61f536be447761d548f60343b117c7349032a233be0bb85a5a44f1511159",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18839",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-18839",
"summary": "An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.",
"evidence": "osv:UBUNTU-CVE-2026-18839",
"products": [
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/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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],
"severity": "low",
"structured": {
"id": "UBUNTU-CVE-2026-18839",
"aliases": [
"UBUNTU-CVE-2026-18839"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"ecosystem": "Ubuntu:14.04:LTS"
},
"versions": [
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"1.16-8",
"1.16-8ubuntu1"
],
"database_specific": {
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},
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"package": {
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"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
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"database_specific": {
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"package": {
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"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1.16-10",
"1.16-11"
],
"database_specific": {
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},
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],
"modified": "2026-10-17T12:59:54.275591352Z",
"provider": "osv",
"upstream": [
"CVE-2026-18839"
],
"references": [
"https://ubuntu.com/security/CVE-2026-18839",
"https://www.cve.org/CVERecord?id=CVE-2026-18839"
]
},
"related_cves": [
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"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359919,
"published_at": "2026-08-05T21:16:00+00:00"
}