High

HTTP Multiline Header Termination

  • Disclosed: 24.04.2023
  • Updated: 11.10.2026 10:22

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.

PlatformPackageVulnerable versionsFixed 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

CVSS score 7.5/10
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

  1. 2022: 1
  2. 2023: 1
  3. 2024: 0
  4. 2025: 0
  5. 2026: 0
  1. HTTP Multiline Header Termination this entry
    High · 7.5 CVE-2023-29530 < 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
  2. Medium · 6.1 CVE-2022-31109 < 2.11.1 2.11.1

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