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CVE-2025-7339

Published Unknown
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Expert Analysis

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CVSS Score

V3.1
0.0
/10
Not Available
Base Score Metrics
Exploitability: N/A Impact: N/A

Attack Vector Metrics

Attack Vector
Not Available
Attack Complexity
Not Available
Privileges Required
Not Available
User Interaction
Not Available
Scope
Not Available

Impact Metrics

Confidentiality
Not Available
Integrity
Not Available
Availability
Not Available

Description

on-headers is a node.js middleware for listening to when a response writes headers. A bug in on-headers versions `<1.1.0` may result in response headers being inadvertently modified when an array is passed to `response.writeHead()`. Users should upgrade to version 1.1.0 to receive a patch. Uses are strongly encouraged to upgrade to `1.1.0`, but this issue can be worked around by passing an object to `response.writeHead()` rather than an array.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

EU Vulnerability Database

Monitored by ENISA for EU cybersecurity

EU Coordination

Not EU Coordinated

Exploitation Status

No Known Exploitation

EUVD ID

View on ENISA

ENISA Analysis

on-headers is a node.js middleware for listening to when a response writes headers. A bug in on-headers versions `<1.1.0` may result in response headers being inadvertently modified when an array is passed to `response.writeHead()`. Users should upgrade to version 1.1.0 to receive a patch. Uses are strongly encouraged to upgrade to `1.1.0`, but this issue can be worked around by passing an object to `response.writeHead()` rather than an array.

Affected Products (ENISA)

jshttp
on-headers

ENISA Scoring

CVSS Score (3.1)

3.4
/10
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

EPSS Score

0.020
probability

ENISA References

https://github.com/jshttp/on-headers/security/advisories/GHSA-76c9-3jph-rj3q
https://github.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867
https://cna.openjsf.org/security-advisories.html
https://github.com/expressjs/morgan/issues/315
https://github.com/jshttp/on-headers/issues/15

Data provided by ENISA EU Vulnerability Database. Last updated: July 17, 2025

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed LOW

on-headers is vulnerable to http response header manipulation

GHSA-76c9-3jph-rj3q

Advisory Details

### Impact A bug in on-headers versions `< 1.1.0` may result in response headers being inadvertently modified when an array is passed to `response.writeHead()` ### Patches Users should upgrade to `1.1.0` ### Workarounds Uses are encouraged to upgrade to `1.1.0`, but this issue can be worked around by passing an object to `response.writeHead()` rather than an array.

Affected Packages

npm on-headers
ECOSYSTEM: ≥0 <1.1.0

CVSS Scoring

CVSS Score

2.5

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

References

WEB https://github.com/jshttp/on-headers/security/advisories/GHSA-76c9-3jph-rj3q
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-7339
WEB https://github.com/expressjs/morgan/issues/315
WEB https://github.com/jshttp/on-headers/issues/15
WEB https://github.com/jshttp/on-headers/commit/c6e384908c9c6127d18831d16ab0bd96e1231867
WEB https://cna.openjsf.org/security-advisories.html
PACKAGE https://github.com/jshttp/on-headers

Advisory provided by GitHub Security Advisory Database. Published: July 17, 2025, Modified: July 17, 2025

Published: Unknown
Last Modified: Unknown
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