CVE-2026-91018

lwip: lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption,...

CVE-2026-91018 is fixed in lwip on 1 platform by DEBIAN-CVE-2026-91018 (version 2.2.1+dfsg1-8), released October 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

n/a

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0040

34th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
lwip · Debian 14	2.2.1+dfsg1-8	DEBIAN-CVE-2026-91018	Oct 10, 2026

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