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CVE-2026-91018

Double Free in lwIP (lightweight IP)

8.7 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Adjacent network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.40%Unchanged since Sep 23, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.7

Double Free in lwIP (lightweight IP)

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.

Record
CVE-2026-91018
CVSS 4.0
8.7 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-415
Updated
2026-11-02
EUVDEUVD-2026-84864 8.7

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.

Record
EUVD-2026-84864
CVSS 4.0
8.7 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-rmx4-24pf-8x6h 8.7

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

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.

Record
GHSA-rmx4-24pf-8x6h
CVSS 4.0
8.7 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-415
Updated
2026-11-02
NVD 8.7

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.

Record
CVE-2026-91018
CVSS 4.0
8.7 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-415
Updated
2026-11-02
OSVDEBIAN-CVE-2026-91018 8.7

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.

Record
DEBIAN-CVE-2026-91018
CVSS 4.0
8.7 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-91018 8.7

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.

Record
UBUNTU-CVE-2026-91018
CVSS 4.0
8.7 HighCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.8 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
lwip
Debian:12
 All versions, plus listed versions
2.1.3+dfsg1-22.1.3+dfsg1-32.1.3+dfsg1-42.2.0+dfsg1-12.2.0+dfsg1-2
Show 17 moreShow less
2.2.0+dfsg1-32.2.0+dfsg1-42.2.0+dfsg1-52.2.0+dfsg1-62.2.0+dfsg1-6.12.2.0+dfsg1-6.1~exp12.2.0+dfsg1-72.2.0+dfsg1-82.2.0+dfsg1-92.2.1+dfsg1-12.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-42.2.1+dfsg1-52.2.1+dfsg1-62.2.1+dfsg1-72.2.1+dfsg1-8
 None known
lwip
Debian:13
 All versions, plus listed versions
2.2.1+dfsg1-12.2.1+dfsg1-1+deb13u12.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-4
Show 4 moreShow less
2.2.1+dfsg1-52.2.1+dfsg1-62.2.1+dfsg1-72.2.1+dfsg1-8
 None known
lwip
Debian:14
 before 2.2.1+dfsg1-8, plus listed versions
2.2.1+dfsg1-12.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-42.2.1+dfsg1-52.2.1+dfsg1-62.2.1+dfsg1-7
2.2.1+dfsg1-8
lwip
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2.1.2-32.1.2-5.12.1.2+dfsg1-12.1.2+dfsg1-42.1.2+dfsg1-4ubuntu0.1~esm1
 None known
lwip
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
2.1.2+dfsg1-82.1.2+dfsg1-92.1.3+dfsg1-12.1.3+dfsg1-1ubuntu0.1~esm1
 None known
lwip
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
2.1.3+dfsg1-22.1.3+dfsg1-42.2.0+dfsg1-22.2.0+dfsg1-32.2.0+dfsg1-4
Show 6 moreShow less
2.2.0+dfsg1-52.2.0+dfsg1-62.2.0+dfsg1-6.12.2.0+dfsg1-6.1build12.2.0+dfsg1-6.1build22.2.0+dfsg1-6.1ubuntu0.1~esm1
 None known
lwip
Ubuntu:26.10
 All versions, plus listed versions
2.2.1+dfsg1-42.2.1+dfsg1-52.2.1+dfsg1-7
 None known
lwip
Ubuntu:Pro:26.04:LTS
 All versions, plus listed versions
2.2.1+dfsg1-22.2.1+dfsg1-32.2.1+dfsg1-42.2.1+dfsg1-4ubuntu0.1~esm1
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-91018 is a high vulnerability (CVSS 8.7) in Lwip Api, published September 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. Fixed in lwip 2.2.1+dfsg1-8.

References

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