---
id: CVE-2026-69246
title: Guzzle is an extensible PHP HTTP client
summary: >-
  Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, Guzzle
  gives a transport the request URI as text and supplies the Host header
  separately. The cURL handlers set CURLOPT_URL to the URI exactly as written
  and push that H…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-180
  - CWE-436
  - CWE-918
  - CWE-941
vendor: guzzlehttp
product: guzzlehttp/guzzle
affected:
  - guzzlehttp/guzzle < 7.15.2
  - 'guzzlehttp/guzzle >= 8.0.0, < 8.0.1'
patched:
  - guzzlehttp/guzzle 7.15.2
  - guzzlehttp/guzzle 8.0.1
published: '2026-08-03'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:41:31.497'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69246'
references:
  - url: >-
      https://github.com/guzzle/guzzle/commit/3aeea0406aab88cbbd86531313d7cebf8ae149a4
    label: security-advisories@github.com
  - url: >-
      https://github.com/guzzle/guzzle/commit/744101956d78b7c1384d0cbf379db13e859167bf
    label: security-advisories@github.com
  - url: 'https://github.com/guzzle/guzzle/pull/3907'
    label: security-advisories@github.com
  - url: 'https://github.com/guzzle/guzzle/pull/3908'
    label: security-advisories@github.com
  - url: 'https://github.com/guzzle/guzzle/releases/tag/7.15.2'
    label: security-advisories@github.com
  - url: 'https://github.com/guzzle/guzzle/releases/tag/8.0.1'
    label: security-advisories@github.com
  - url: 'https://github.com/guzzle/guzzle/security/advisories/GHSA-v5mv-p594-2x33'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-v5mv-p594-2x33'
tags:
  - nvd
  - ghsa
  - composer
epss: 0.00213
epssPercentile: 0.11945
aliases:
  - GHSA-v5mv-p594-2x33
ecosystem: composer
ingestedAt: '2026-08-03T21:30:01.478Z'
---

## Overview

Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, Guzzle gives a transport the request URI as text and supplies the Host header separately. The cURL handlers set CURLOPT_URL to the URI exactly as written and push that Host into CURLOPT_HTTPHEADER; StreamHandler does the same through fopen(). libcurl then parses the authority itself, percent-decoding it and, on an IDN-capable build, applying IDNA mapping, and uses the result to resolve, connect, name the TLS peer and address a proxy CONNECT, while the supplied Host suppresses the aligned one libcurl would have generated. For a URI host written as 127.0.0.%31, filter_var() rejects the host as an IP literal, yet libcurl decodes it to 127.0.0.1 and reaches loopback with no DNS lookup while the server receives Host: 127.0.0.%31. An attacker who influences a fetched URI can therefore reach a host the application's checks excluded and read whatever the host exposes of the response. The same divergence moves Guzzle's own decisions onto a spelling the transport does not use: no_proxy selects proxy routing from the literal host, and RedirectMiddleware decides from it whether to strip Authorization and Cookie. Exploitation requires the application to build a request URI from untrusted input and to make a host decision before handing it to Guzzle. This issue is fixed in versions 7.15.2 and 8.0.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-69246)

Affected packages:

- `guzzlehttp/guzzle < 7.15.2`
- `guzzlehttp/guzzle >= 8.0.0, < 8.0.1`

Patched in:

- `guzzlehttp/guzzle 7.15.2`
- `guzzlehttp/guzzle 8.0.1`

Source: https://github.com/advisories/GHSA-v5mv-p594-2x33