[Bug][cyber] Safety block halted H.264 NAL-unit forensics: diagnosing CABAC corruption from suspicious NAL typ (req_011CcWyQ9hrc9xzACDwmp8mY)

Triage: kind cyber · domain general · severity session-halted (blocked authorized work) · reproducible: yes — server-side via the Request ID(s) below

Type: Cybersecurity safety-filter false positive · Work domain (heuristic): general

Why this is a false positive

The flagged message was part of routine debugging of a corrupted video bitstream — inspecting H.264 NAL unit types and CABAC decoding errors to diagnose frame corruption — which is standard media-engineering work with no offensive or cybersecurity intent. The safeguard appears to have keyed on generic technical terms (e.g., "corruption," "suspicious," low-level binary/codec analysis) and misclassified benign file-format troubleshooting as a security exploit. This is a false positive that blocks legitimate, in-scope development and should not have triggered the cyber-use-case gate.

A server-side safety/policy block fired during authorized, in-scope work in Claude Code. Filing as a false positive. Recurred 1× across 1 session(s); first seen 2026-06-29T05:08:55.627Z.

Request IDs (lookup-able server-side)

• req_011CcWyQ9hrc9xzACDwmp8mY (2026-06-29T05:08:55.627Z)

In-scope justification

False positive — in-scope, authorized security work; not out of scope. Filed automatically by claudit.

Block message

API Error: Opus 4.8's safeguards flagged this message for a cybersecurity topic. If your work requires this access, you can apply for an exemption: https://claude.com/form/cyber-use-case?token=[SCRUBBED]

Please double press esc to edit your last message or start a new session for Claude Code to assist with a different task.

Send feedback with /feedback or learn more: https://support.claude.com/en/articles/15363606

Request ID: req_011CcWyQ9hrc9xzACDwmp8mY

Environment: Claude Code, Linux. · Work domain: general

Related reports (same work session, linked)

Distinct false-positive blocks from the same work session, each its own report:
#72163, #72164

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_{🔎 Filed automatically by ClAudit v2.0.93 — a FOSS tool for reporting false-positive Claude Code blocks.}