Vulnerability · Published Aug 28, 2026 · Assigned by VulnCheck

CVE-2026-82286gpt-crawler Arbitrary File Write via outputFileName Parameter

High 8.6

In plain English

A high-severity path traversal in gpt-crawler from BuilderIO. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)0.5%top 55.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official description

gpt-crawler through 1.5.1 fails to validate the outputFileName parameter in the POST /crawl endpoint, allowing unauthenticated attackers to write arbitrary files to any filesystem path. Attackers can supply absolute paths or parent-directory segments to overwrite existing files with content sourced from attacker-controlled URLs.

Affected products (as reported)

Vendor	Product	Versions
BuilderIO	gpt-crawler	0 – through 1.5.1

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

References

GitHub Issue #418 issue-tracking
https://github.com/BuilderIO/gpt-crawler product
Vulnerable code: core.ts technical-description
Vulnerable code: config.ts technical-description
VulnCheck Advisory: gpt-crawler Arbitrary File Write via outputFileName Parameter third-party-advisory