CVE-2026-91840 (GCVE-0-2026-91840)
Vulnerability from cvelistv5
Published
2026-09-25 17:56
Modified
2026-09-28 12:44
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Summary
A flaw was found in NetworkManager-vpnc. This vulnerability allows a local unprivileged user to escalate privileges to root. By injecting a newline character into the VPN username field, an attacker can manipulate the vpnc configuration to execute an arbitrary program with root privileges when the malicious VPN connection is activated.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| GNOME | NetworkManager-vpnc |
Version: 0 ≤ |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-91840",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-26T03:55:53.355838Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-28T12:44:17.583Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://gitlab.gnome.org/GNOME/NetworkManager-vpnc",
"defaultStatus": "unaffected",
"packageName": "network-manager-vpnc",
"product": "NetworkManager-vpnc",
"vendor": "GNOME",
"versions": [
{
"lessThan": "*",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Red Hat would like to thank Andreas Gabriel Berbescu for reporting this issue."
}
],
"datePublic": "2026-09-15T09:50:37.313Z",
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in NetworkManager-vpnc. This vulnerability allows a local unprivileged user to escalate privileges to root. By injecting a newline character into the VPN username field, an attacker can manipulate the vpnc configuration to execute an arbitrary program with root privileges when the malicious VPN connection is activated."
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Important"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-93",
"description": "Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-25T17:56:32.736Z",
"orgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5",
"shortName": "fedora"
},
"references": [
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-91840"
},
{
"name": "RHBZ#2533642",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533642"
},
{
"url": "https://gitlab.gnome.org/Archive/NetworkManager-vpnc/-/work_items/19"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-09-15T09:50:37.313Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-09-15T09:50:37.313Z",
"value": "Made public."
}
],
"title": "Networkmanager-vpnc: networkmanager-vpnc: local privilege escalation to root via newline injection in vpn username",
"workarounds": [
{
"lang": "en",
"value": "If vpnc VPN connections are not required, the NetworkManager-vpnc package can be removed to eliminate the vulnerability. This action will prevent the system from establishing vpnc-based VPN connections.\n\nTo remove the package, execute the following command as root:\n`# dnf remove NetworkManager-vpnc`\n\nNote that removing this package may impact functionality if vpnc VPNs are actively used."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_redhatCweChain": "CWE-93: Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)"
}
},
"cveMetadata": {
"assignerOrgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5",
"assignerShortName": "fedora",
"cveId": "CVE-2026-91840",
"datePublished": "2026-09-25T17:56:32.736Z",
"dateReserved": "2026-09-15T08:28:01.333Z",
"dateUpdated": "2026-09-28T12:44:17.583Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-91840\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-26T03:55:53.355838Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-25T18:15:07.267Z\"}}], \"cna\": {\"title\": \"Networkmanager-vpnc: networkmanager-vpnc: local privilege escalation to root via newline injection in vpn username\", \"credits\": [{\"lang\": \"en\", \"value\": \"Red Hat would like to thank Andreas Gabriel Berbescu for reporting this issue.\"}], \"metrics\": [{\"other\": {\"type\": \"Red Hat severity rating\", \"content\": {\"value\": \"Important\", \"namespace\": \"https://access.redhat.com/security/updates/classification/\"}}}, {\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"GNOME\", \"product\": \"NetworkManager-vpnc\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"semver\"}], \"packageName\": \"network-manager-vpnc\", \"collectionURL\": \"https://gitlab.gnome.org/GNOME/NetworkManager-vpnc\", \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-09-15T09:50:37.313Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2026-09-15T09:50:37.313Z\", \"value\": \"Made public.\"}], \"datePublic\": \"2026-09-15T09:50:37.313Z\", \"references\": [{\"url\": \"https://access.redhat.com/security/cve/CVE-2026-91840\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2533642\", \"name\": \"RHBZ#2533642\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://gitlab.gnome.org/Archive/NetworkManager-vpnc/-/work_items/19\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"If vpnc VPN connections are not required, the NetworkManager-vpnc package can be removed to eliminate the vulnerability. This action will prevent the system from establishing vpnc-based VPN connections.\\n\\nTo remove the package, execute the following command as root:\\n`# dnf remove NetworkManager-vpnc`\\n\\nNote that removing this package may impact functionality if vpnc VPNs are actively used.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in NetworkManager-vpnc. This vulnerability allows a local unprivileged user to escalate privileges to root. By injecting a newline character into the VPN username field, an attacker can manipulate the vpnc configuration to execute an arbitrary program with root privileges when the malicious VPN connection is activated.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-93\", \"description\": \"Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5\", \"shortName\": \"fedora\", \"dateUpdated\": \"2026-09-25T17:56:32.736Z\"}, \"x_redhatCweChain\": \"CWE-93: Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)\"}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-91840\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-28T12:44:17.583Z\", \"dateReserved\": \"2026-09-15T08:28:01.333Z\", \"assignerOrgId\": \"92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5\", \"datePublished\": \"2026-09-25T17:56:32.736Z\", \"assignerShortName\": \"fedora\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…