Arbitrary File Write Vulnerability in gpt-crawler by BuilderIO
CVE-2026-82286

8.8HIGH

Key Information:

Vendor

Builderio

Status
Gpt-crawler
Vendor
CVE Published:
28 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-82286?

The gpt-crawler, up to version 1.5.1, contains a significant flaw in its handling of the outputFileName parameter in the POST /crawl endpoint. This vulnerability permits unauthenticated users to write arbitrary files to any location within the filesystem. By providing carefully crafted input that includes absolute paths or parent directory traversal segments, attackers can overwrite existing files with content retrieved from attacker-controlled URLs. This poses a serious security risk as it can lead to unauthorized file manipulation and potential system compromise.

Affected Version(s)

gpt-crawler 0 <= 1.5.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-82286-gpt-crawler-Arbitrary-File-Write
Created by BiiTts

References

https://github.com/BuilderIO/gpt-crawler/issues/418
issue-tracking
https://github.com/BuilderIO/gpt-crawler
product
https://github.com/BuilderIO/gpt-crawler/blob/d2245d66a5a...
technical-description

CVSS V4

Score:
8.8
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.