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TI-2026-61856 Aliases CVE-2026-91018GHSA-rmx4-24pf-8x6h

Double Free in lwIP (lightweight IP)

Priority MEDIUM 40CWE-415Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-415 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00397 34th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
lwIPlwIP API2.0.1 – 2.2.1—No fix listedCNA
  • lwIP API VendorlwIP Affected 2.0.1 – 2.2.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-91018
  2. 2026-10-03 Alias added: GHSA-rmx4-24pf-8x6h
  3. 2026-10-25 Priority changed: LOW → MEDIUM

References

Other 3

  • TI-2026-76190 Stack out-of-bounds write in lwIP mDNS response handler CVSS 4.0MEDIUM 6.0
  • TI-2026-59484 Out-of-bounds write in lwIP TCP/IP Stack MQTT Client Application CVSS 4.0CRITICAL 9.3
  • TI-2026-82411 Out-of-bounds read in lwIP SNMP agent leaks adjacent memory CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences