HTTP Multiline Header Termination
Impact
Affected versions of Laminas Diactoros accepted a single line feed (LF / \n ) character at the end of a header name. When serializing such a header name containing a line-feed into the on-the-wire representation of a HTTP/1.x message, the resulting message would be syntactically invalid, due to the header line being terminated too early. An attacker that is able to control the header names that are passed to Laminas Diactoros would be able to intentionally craft invalid messages, possibly causing application errors or invalid HTTP requests being sent out with an PSR-18 HTTP client. The latter might present a denial of service vector if a remote service’s web application firewall bans the application due to the receipt of malformed requests.
Patches
The problem has been patched in the following versions:
- 2.18.1
- 2.19.1
- 2.20.1
- 2.21.1
- 2.22.1
- 2.23.1
- 2.24.2
- 2.25.2
Workarounds
Validate HTTP header keys and/or values, and if using user-supplied values, filter them to strip off leading or trailing newline characters before calling withHeader().
References
- CVE-2023-29197
- GHSA-wxmh-65f7-jcvw
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | laminas/laminas-diactoros | < 2.18.1, >= 2.19.0, < 2.19.1, >= 2.20.0, < 2.20.1, >= 2.21.0, < 2.21.1, >= 2.22.0, < 2.22.1, >= 2.23.0, < 2.23.1, >= 2.24.0, < 2.24.2, >= 2.25.0, < 2.25.2 | 2.18.1, 2.19.1, 2.20.1, 2.21.1, 2.22.1, 2.23.1, 2.24.2, 2.25.2 |
References
- https://github.com/laminas/laminas-diactoros/security/advisories/GHSA-xv3h-4844-9h36
- https://nvd.nist.gov/vuln/detail/CVE-2023-29530
- https://github.com/laminas/laminas-diactoros/commit/7e721a60a09c5119c98694c2d23fc031094e1f1c
- https://github.com/advisories/GHSA-wxmh-65f7-jcvw
- https://github.com/laminas/laminas-diactoros
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BPW54QK7ISDALPLP2CKODU4ZIVRYS336
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-20- Platform
- Composer
- Package
laminas/laminas-diactoros- Disclosed
- 24.04.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-xv3h-4844-9h36 - CC BY 4.0
Vulnerability history: laminas/laminas-diactoros
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 07.2022 04.2023
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 1
Disclosures per year
- 2022: 1
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 0
-
HTTP Multiline Header Termination this entry
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