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CVE-2026-82286 – Unauthenticated Arbitrary File Write – gpt-crawler ≤1.5.1

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Summary

CVE-2026-82286 is an unauthenticated arbitrary file write vulnerability (CWE-22, Path Traversal) affecting gpt-crawler through version 1.5.1, developed by BuilderIO. The flaw resides in the POST /crawl API endpoint, which fails to validate the outputFileName parameter, allowing remote attackers to write files with attacker-controlled content to arbitrary filesystem locations without authentication. The issue carries a High severity rating (CVSS 8.8).

Technical details

  • Root cause: The POST /crawl endpoint accepts a user-supplied outputFileName parameter and passes it through to file-write logic in src/core.ts and src/config.ts without canonicalizing or restricting the resulting path.
  • Trigger conditions: An attacker sends a crawl request specifying an outputFileName value containing an absolute path or parent-directory traversal sequences (e.g., ../../), combined with a crawl target URL the attacker controls.
  • Attack vector: Network-based, requires no authentication and no user interaction — the attacker only needs network access to the exposed /crawl endpoint.
  • Impact: The server writes the crawled content (sourced from an attacker-controlled URL) to the attacker-specified path, enabling overwrite of existing files on the host filesystem. This can lead to data corruption, configuration tampering, or — depending on what files are overwritten and how the host processes them — a path toward further compromise of the system running gpt-crawler.

Affected software

  • BuilderIO gpt-crawler — all versions from 0 through 1.5.1 (inclusive)

Severity

  • CVSS v3.1 Base Score: 8.6 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
  • CVSS v4.0 Base Score: 8.8 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: As of this writing, no patched release of gpt-crawler has been published by the maintainers to address this issue. Organizations should monitor the official BuilderIO gpt-crawler GitHub repository for a fix and upgrade as soon as one becomes available.
  • Workarounds / network mitigations (no patch available):
    • Do not expose the gpt-crawler /crawl API endpoint directly to untrusted networks or the public internet; restrict access to trusted, authenticated internal callers only.
    • Place an authentication/authorization layer (e.g., API gateway, reverse proxy with auth) in front of the gpt-crawler service, since the underlying application does not enforce authentication on this endpoint.
    • Where feasible, run the gpt-crawler service with a restricted filesystem context (e.g., a container or sandboxed user with write access limited to its intended output directory) to contain the impact of an arbitrary file write.
    • Add input validation/allow-listing at a proxy or WAF layer to reject requests where outputFileName contains absolute paths or ../ traversal sequences.
    • Monitor for unexpected file creation or modification activity on hosts running gpt-crawler.

References

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