{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-91840","assignerOrgId":"92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5","state":"PUBLISHED","assignerShortName":"fedora","dateReserved":"2026-09-15T08:28:01.333Z","datePublished":"2026-09-25T17:56:32.736Z","dateUpdated":"2026-09-28T12:44:17.583Z"},"containers":{"cna":{"title":"Networkmanager-vpnc: networkmanager-vpnc: local privilege escalation to root via newline injection in vpn username","metrics":[{"other":{"content":{"value":"Important","namespace":"https://access.redhat.com/security/updates/classification/"},"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"}],"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."}],"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"}],"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"}],"datePublic":"2026-09-15T09:50:37.313Z","problemTypes":[{"descriptions":[{"cweId":"CWE-93","description":"Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","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."}],"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."}],"credits":[{"lang":"en","value":"Red Hat would like to thank Andreas Gabriel Berbescu for reporting this issue."}],"providerMetadata":{"orgId":"92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5","shortName":"fedora","dateUpdated":"2026-09-25T17:56:32.736Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-26T03:55:53.355838Z","id":"CVE-2026-91840","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-28T12:44:17.583Z"}}]}}