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Critical Double Free Vulnerability in lwIP Networking Stack
CVE-2026-91018 affects lwIP API versions 2.0.1 through 2.2.1, enabling potential code execution and denial of service
CyberIntel Desk1 min read
Key Takeaways
- CISA has issued advisory icsa-26-265-02 for a critical double free vulnerability in lwIP (CVE-2026-91018).
- Affected versions include lwIP API >=2.0.1 and <=2.2.1.
- Exploitation could result in system crash, DoS, memory corruption, or code execution.
- CVSS v3.1 base score is 8.8; CVSS v4.0 base score is 8.7.
- No known public exploitation has been reported to CISA.
- The vulnerability was reported by Eric Evenchick of Tetrel Security.
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The Cybersecurity and Infrastructure Security Agency (CISA) has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog based on evidence of active exploitation. CVE-2026-88771 involves improper input validation and CVE-2026-88772 involves improper restriction of operations within the bounds of a memory buffer, both affecting Citrix NetScaler products. The additions trigger remediation requirements under Binding Operational Directive 26-04 for Federal Civilian Executive Branch agencies.
CISA Advisories2 min read
