CVE-2026-91018

Double Free in lwIP (lightweight IP)

Published Sep 22, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Users of lwIP are encouraged to update their version of lwIP using the repository found at  https://cgit.git.savannah.gnu.org/cgit/lwip.git . The commit identifier that contains the fix is f873b6295933e4149a2132adf3e9a2d2a676a5ec.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Lwip
Lwip lwip
Vendors & Products Lwip
Lwip lwip
Type Values Removed Values Added
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.
Title Double Free in lwIP (lightweight IP)
Weaknesses CWE-415
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
icscert
Published
Updated
Sep 23, 2026, 1:05 PM
Reserved
Sep 14, 2026, 4:40 PM
Status
Awaiting Analysis
Published
Sep 22, 2026, 9:17 PM
Modified
Sep 23, 2026, 7:42 PM