Anthropic Mythos AI Model Scans Curl, Finds One Confirmed Vulnerability
Run the Mythos scan report and verify the single confirmed vulnerability before the 8.21.0 release.
Patch the confirmed vulnerability in curl before the 8.21.0 release deadline in late June.
Summary
Anthropic’s new AI model Mythos, designed for source‑code security scanning, was offered to a select group of companies before a public release. The Linux Foundation’s Alpha Omega project granted the curl team access, and a Mythos scan of curl’s master branch covered 178 000 lines in the src/ and lib/ directories. The scan initially reported five confirmed security vulnerabilities, but after manual review only one was confirmed, with the remaining four being false positives or non‑vulnerabilities. The confirmed flaw will be published as a low‑severity CVE in curl 8.21.0, scheduled for release in late June. Mythos uses LLM subagents for parallel file reads and does not employ automated SAST tooling, finding no memory‑safety issues in the codebase. The curl project has 176 000 lines of code, 660 000 words, 573 authors, 1 465 merged contributors, 188 CVEs, 20 billion instances, 110 operating systems, and 28 CPU architectures.
The report highlights that Mythos’s approach—LLM subagents and manual verification—provides a high‑threshold analysis, but the overall number of bugs found is lower than previous AI tools due to the codebase’s maturity. The single confirmed vulnerability will be addressed before the upcoming release, and the team is investigating the other reported bugs.
This demonstrates that even cutting‑edge AI models can aid security reviews, but human oversight remains essential to validate findings and prioritize fixes.
Key changes
- Anthropic released Mythos, an AI model for source‑code security scanning, not publicly yet.
- Mythos was offered to selected companies, including curl via the Linux Foundation.
- The scan covered 178 000 lines of curl code and initially reported five confirmed vulnerabilities.
- Only one vulnerability was confirmed after review; the rest were false positives or non‑issues.
- The confirmed flaw will be published as a low‑severity CVE in curl 8.21.0, due for release in late June.
- Mythos uses LLM subagents for parallel file reads and no automated SAST tooling.