SB2025082222 - Improper Handling of Unexpected Data Type in jshttp on-headers
Published: August 22, 2025
Security Bulletin ID
SB2025082222
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Handling of Unexpected Data Type (CVE-ID: CVE-2025-7339)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application. A remote attacker can inadvertently modify response headers when an array is passed to `response.writeHead()`
Remediation
Install update from vendor's website.
References
- https://cna.openjsf.org/security-advisories.html
- https://github.com/expressjs/morgan/issues/315
- https://github.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867
- https://github.com/jshttp/on-headers/issues/15
- https://github.com/jshttp/on-headers/security/advisories/GHSA-76c9-3jph-rj3q