# CVE-2023-29197: Improper header name validation in guzzlehttp/psr7

Source: https://junglewise.ai/threats/cve-2023-29197-improper-header-name-validation-in-guzzlehttp-psr7  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-04-19  
License: CC BY 4.0 with a link back

CVE-2023-29197 · Severity: low · CVSS 3.1 · Published 2023-04-19

Improper header name validation in guzzlehttp/psr7

Technologies: [guzzlehttp/psr7 (Packagist)](https://junglewise.ai/threats/technologies/guzzlehttp-psr7). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2023-29197 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-29197 being exploited in the wild.

**How severe is CVE-2023-29197?** Low severity, with a CVSS score of 3.1, published 19 April 2023.

**Which products and versions are affected?** guzzlehttp/psr7 (Packagist) ECOSYSTEM:introduced=0,fixed=1.9.1.

**Is there a fix for CVE-2023-29197?** Yes. guzzlehttp/psr7 (Packagist): upgrade to 1.9.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2023-29197?** Check whether you run guzzlehttp/psr7 (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- guzzlehttp/psr7 (Packagist): upgrade to 1.9.1 or later

  ```sh
  composer require guzzlehttp/psr7:^1.9.1
  ```


## Affected products

- guzzlehttp/psr7 (Packagist) ECOSYSTEM:introduced=0,fixed=1.9.1

## Identifiers

- CVE-2023-29197
- GHSA-wxmh-65f7-jcvw

## Related threats

- [Guzzle PSR-7 host confusion via weak URI host validation](https://junglewise.ai/threats/cve-2026-59882-guzzle-psr-7-host-confusion-via-weak-uri-host-validation)
- [Guzzle PSR-7 CRLF injection in HTTP start-line serialization](https://junglewise.ai/threats/cve-2026-55766-guzzle-psr-7-crlf-injection-in-http-start-line-serialization)
- [GuzzleHttp PSR-7 CRLF injection in URI host component](https://junglewise.ai/threats/cve-2026-49214-guzzlehttp-psr-7-crlf-injection-in-uri-host-component)
- [GuzzleHttp PSR-7 Host confusion via authority reinterpretation](https://junglewise.ai/threats/cve-2026-48998-guzzlehttp-psr-7-host-confusion-via-authority-reinterpretation)
- [Improper Input Validation in guzzlehttp/psr7](https://junglewise.ai/threats/cve-2022-24775-drupal-core-2022-006-drupal-uses-the-third-party-guzzle-library)