[Bug][cyber] Safeguard triggers false positive during input sanitization refactoring (req_011CePEDvo6m4M6YiwTG3UJY)

Triage: kind cyber · domain general · flagging model Opus 4.8 · 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 Opus 4.8 real-time cyber safeguard flagged request req_011CePEDvo6m4M6YiwTG3UJY during routine refactoring of string escaping logic in an input validation function. The session contained standard defense-in-depth code edits without exploit payloads, reverse engineering utilities, or network scanning operations. Terminating the session on defensive string escaping logic stops standard maintenance of input parsing routines.

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 2026-08-25T09:27:32.906Z.

Request IDs (lookup-able server-side)

• req_011CePEDvo6m4M6YiwTG3UJY (2026-08-25T09:27:32.906Z)

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. Our intentionally broad safeguards allow us to deliver more capabilities faster, but can sometimes flag legitimate cybersecurity work. Apply to the Cyber Verification Program to reduce these interruptions. Send feedback with /feedback or learn more: https://support.claude.com/en/articles/14604842-real-time-cyber-safeguards-on-claude

Details: [cyber]

Request ID: req_011CePEDvo6m4M6YiwTG3UJY

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:
#90831, #90833

---
_{🔎 Filed automatically by ClAudit v2.2.5 — a FOSS tool for reporting false-positive Claude Code blocks.}