Anthropic's Mythos Identifies Low-Severity Vulnerability in cURL

Anthropic's AI tool Mythos scanned the cURL codebase, revealing five findings, of which only one was confirmed as a low-severity vulnerability. The cURL maintainer, Daniel Stenberg, noted that three findings were false positives and one was a simple bug. The confirmed vulnerability is set to be published as a CVE alongside the upcoming cURL 8.21.0 release in late June 2026. Stenberg emphasized the importance of human review in conjunction with automated tools, citing that Mythos's outputs require careful triage. This incident reflects the broader challenges of relying solely on automated scanning tools for security assessments. The cURL project has previously identified 200 to 300 bugs using various AI and static analysis tools. Stenberg's experience highlights the evolving role of AI in software security, but also the limitations of current automated tools.

Key Points: • Mythos identified one low-severity vulnerability in cURL after scanning. • Three of the five reported findings were false positives, highlighting the need for human review. • The confirmed vulnerability will receive a CVE entry with a planned release in June 2026.