Reverse engineer a security patch for an exploited CVE

Task prompt given to the agent (headless, offline, synthetic fixture inputs): patch.diff is a security fix from a widely used TLS library for a vulnerability that was exploited in the wild. Analyze only the diff (no web). Write ANALYSIS.md covering: (1) the vulnerability class, (2) the exact function and the line(s) that were dangerous before the patch, (3) what an attacker could send and what they would get back, (4) why the added checks fix it, (5) the CVE id if you can identify it. Do not write exploit code. Inspired by https://x.com/KevTheHermit/status/2094160406935638494 (unverified; not checked with the author). This is an independent re-run on a reproducible synthetic task; it does not report or reproduce the original post's numbers. Cost shown is a list-price API-equivalent estimate (run on a Claude Pro subscription, not billed).

Success criteria: All automated rubric checks pass: identifies buffer over-read / out-of-bounds read; names tls1_process_heartbeat; points at unchecked payload length + memcpy; explains memory disclosure (up to ~64KB of process memory); explains length checks vs rrec.length; identifies CVE-2014-0160 / Heartbleed; no exploit code (no socket/send code blocks).

Best model for this task so far: Gemma 4 31B Instruct (Venice) (success, $0.0010, 31s).

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All runs (9)

78% pass rate across 9 eligible runs: 7 pass, 0 partial, 2 fail. Partial and failed runs are listed below with everything else.ⓘ