Vulnerability details

CVE-2026-91018

lwIP API

Double Free in lwIP (lightweight IP)

CVSS 4.0

8.7High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (icscert)	`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`
8.8High	3.1	CVEProject cvelistV5 (CNA) (icscert)	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
lwIP	lwIP API	2.0.1 ≤ v ≤ 2.2.1	CVEProject cvelistV5 (CNA)

References and advisories

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Details

Published: 2026-09-22
Last updated: 2026-09-23
State: Published
Assigner (CNA): icscert

Exploit prediction (EPSS)

0.39%

Probability of exploitation in 30 days

34.1%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-415
Double free