[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fA-rxe_KY7oEO6QYHI9bbjGKeUXQcD82RdArTMJ8nVQA":3},{"lesson":4},{"id":5,"slug":6,"article_id":7,"title":8,"body":9,"prevention":10,"framework_refs":11,"status":21,"created_at":22,"published_at":23,"article":24,"tags":28,"podcasts":41},"093d9469-44e3-4ac9-a7e1-a29ea50504cc","25-year-old-curl-flaw-highlights-legacy-code-risk-and-ai-assisted-discovery","53f729e9-d5a2-4e49-a937-7d9cdbcd0bf2","25-Year-Old Curl Flaw Highlights Legacy Code Risk and AI-Assisted Discovery","A critical authentication bypass vulnerability lurked undetected in the widely-used curl library for over 25 years, underscoring how foundational open-source components can harbor severe flaws across their entire version history. The flaw, enabling improper mTLS connection reuse, could allow attackers to bypass authentication silently — a particularly dangerous condition in environments relying on mutual TLS for strong identity assurance. This case illustrates that longevity in open-source software does not imply security, and that even low-level utility libraries embedded in countless products require structured vulnerability review. The scale of this single release — 18 patches at once — also highlights the risk of deferred security debt accumulating in widely-deployed dependencies.","**Immediate actions:**\n- Upgrade all instances of curl and libcurl to the latest patched version as a priority across all environments.\n- Audit applications and services that rely on mTLS for authentication to assess exposure during the vulnerable window.\n- Scan your software bill of materials (SBOM) to identify all direct and transitive dependencies on curl or libcurl.\n\n**Long-term improvements:**\n- Maintain a comprehensive, continuously updated SBOM for all software products to enable rapid response when upstream vulnerabilities are disclosed.\n- Implement automated dependency tracking and patch alerting for all open-source components used in production.\n- Establish a formal third-party and open-source component risk management program aligned with supply chain security standards.\n\n**Detection measures:**\n- Deploy runtime application monitoring to detect anomalous TLS connection reuse patterns that may indicate exploitation attempts.\n- Integrate AI-assisted code analysis tools into your secure development lifecycle to surface latent vulnerabilities in legacy codebases.\n- Configure vulnerability scanners to flag known-vulnerable versions of curl in all asset inventories on a continuous basis.",[12,13,14,15,16,17,18,19,20],"CIS Control 2: Inventory and Control of Software Assets","CIS Control 7: Continuous Vulnerability Management","NIST SP 800-53 SI-2: Flaw Remediation","NIST SP 800-53 SA-12: Supply Chain Protection","NIST SP 800-161: Supply Chain Risk Management Practices","NIST SSDF PW.4: Reuse Existing, Well-Secured Software","OWASP A06:2021 – Vulnerable and Outdated Components","ISO\u002FIEC 27001 A.12.6.1: Management of Technical Vulnerabilities","NTIA Software Bill of Materials (SBOM) Guidance","published","2026-06-25T10:20:22.64292+00:00","2026-06-25T10:20:22.517+00:00",{"id":7,"url":25,"slug":26,"title":27},"https:\u002F\u002Fwww.securityweek.com\u002F25-year-old-vulnerability-patched-in-curl\u002F","25-year-old-vulnerability-patched-in-curl-bdd63d","25-Year-Old Vulnerability Patched in Curl",[29,35],{"id":30,"name":31,"slug":32,"description":33,"color":34},"05757c8d-6b93-4194-b35d-7359e7d33b0e","Vulnerability Management","vulnerability-management","Missing scans, no risk prioritization","#fb923c",{"id":36,"name":37,"slug":38,"description":39,"color":40},"af7fce9e-1ce8-4156-93bc-09dcfbfdf29d","Patch Management","patch-management","Unpatched vulnerabilities, delayed updates","#ef4444",[]]