---
id: CVE-2026-69245
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,
  SetCookie::matchesDomain() gives every subdomain of a cookie Domain that
  cookie unless SetCookie::matchesDomain() recognizes the Domain as an IP
  literal or a numeric hos…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-180
  - CWE-346
  - CWE-384
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-2026-69245'
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-f7vp-7xgx-4w4r'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-f7vp-7xgx-4w4r'
tags:
  - nvd
  - ghsa
  - composer
epss: 0.00137
epssPercentile: 0.03462
aliases:
  - GHSA-f7vp-7xgx-4w4r
ecosystem: composer
ingestedAt: '2026-08-03T21:30:01.510Z'
---

## Overview

Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, SetCookie::matchesDomain() gives every subdomain of a cookie Domain that cookie unless SetCookie::matchesDomain() recognizes the Domain as an IP literal or a numeric host, and the decision comes from the domain's own text, so two spellings a transport reads as an address keep subdomain scope. Hexadecimal and mixed-base forms such as 0x7f000001 and 0177.0.0.0x1 go unrecognized while libcurl 8.21.0 reads both as 127.0.0.1. A percent-escaped Domain keeps that scope on both branches because percent-decoding sits above numeric parsing, so 192.168.0.%31 and 127.0.0.1%2e are registered names in the URI grammar rather than address literals, and no numeric rule in any base classifies them, while libcurl decodes the host before resolving and reads them as 192.168.0.1 and 127.0.0.1. A cookie stored for Domain=0x7f000001 is placed in the Cookie header of a request to evil.0x7f000001, disclosing a session identifier or token to a host that is not that address, and a response from evil.0x7f000001 setting Domain=0x7f000001 is accepted into the jar and replayed to the address, so a server answering for the look-alike name can fix a session or set application state. Exploitation requires the application to enable cookie support, address an origin by one of these spellings, and contact a host whose name ends in that spelling. 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-2026-69245)

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-f7vp-7xgx-4w4r