{"id":"CVE-2026-91018","title":"lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system.","summary":"lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system.","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-415"],"vendor":"lwIP","product":"lwIP API","affected":["api >= 2.0.1 <= 2.2.1"],"published":"2026-09-22","updated":"2026-09-23","sourceUpdated":"2026-09-23T19:42:48.540","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91018","references":[{"url":"https://cgit.git.savannah.gnu.org/cgit/lwip.git","label":"ics-cert@hq.dhs.gov"},{"url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-265-02.json","label":"ics-cert@hq.dhs.gov"},{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-265-02","label":"ics-cert@hq.dhs.gov"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91018.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91018"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91018"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00397,"epssPercentile":0.33777,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-23T13:03:21.536853Z"},"ingestedAt":"2026-09-22T21:11:40.325Z","slug":"CVE-2026-91018","body":"## Overview\n\nlwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91018.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}