CVE-2026-91018

Double Free in lwIP (lightweight IP)

State: Published
Severity: 8.7 High
Published: Sep 22, 2026
Updated: Sep 23, 2026
Reserved: Sep 14, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	icscert
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	icscert

Weaknesses

CWE-415 Double free

Affected Products

Product	Versions
lwIP APIlwIP	2.0.1 through 2.2.1Affected

References

https://cgit.git.savannah.gnu.org/cgit/lwip.git
https://www.cisa.gov/news-events/ics-advisories/icsa-26-265-02
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-265-02.json

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