CVE-2026-82286 BuilderIO CVE debrief

Who should care

Defenders and security teams responsible for gpt-crawler deployments should assess exposure and verify vulnerable versions. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Security teams should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed and review compensating controls for exposed systems while remediation is scheduled and

Why it matters

CVE-2026-82286 allows unauthenticated attackers to write arbitrary files, posing a high risk to gpt-crawler deployments. Defenders should assess exposure, verify vulnerable versions, and implement compensating controls.

• Potential for arbitrary file writes to sensitive areas of the filesystem.
• Possible overwrite of existing files with attacker-controlled content.
• Risk of unauthorized data modification or deletion.
• Need for verification of vulnerable versions and remediation.

Technical summary

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, potentially overwriting existing files with content sourced from attacker-controlled URLs. This vulnerability poses a high risk to gpt-crawler deployments, with possible operational impacts including unauthorized data modification or deletion. Defenders should assess exposure, verify vulnerable versions, and implement compensating controls to restrict file writes to authorized paths.

Defensive priority

High priority for defenders to assess exposure and verify vulnerable versions.

Recommended defensive actions

• Assess exposure by verifying if gpt-crawler versions 1.5.1 or earlier are in use.
• Review and validate outputFileName parameter handling in gpt-crawler configurations.
• Implement compensating controls to restrict file writes to authorized paths.
• Monitor for suspicious file modifications and system changes.
• Review relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but vendor remediation and affected versions require verification. The gpt-crawler GitHub repository and config.ts and core.ts files may offer additional context. Defenders should review these sources and verify vulnerable versions to assess exposure. The lack of explicit evidence limits the confidence in the vulnerability details, and further verification is necessary.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.