CVE-2026-69245Network attack vector

Cookie disclosure and fixation via noncanonical domains

Published Aug 3, 2026 · Updated Aug 3, 2026

Cookie scope validation in Guzzle 7.15.1 and earlier and 8.0.0 allows remote attackers to disclose or plant cookies via crafted hostnames. SetCookie::matchesDomain() tests raw Domain text before transport canonicalization, so hexadecimal, mixed-base, and percent-escaped addresses retain subdomain scope. Exploitation requires enabled cookie support, a noncanonical origin spelling, and access to a matching private, split-horizon, or container-zone hostname.

CVSS severity6.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cookie scope validation in Guzzle 7.15.1 and earlier and 8.0.0 allows remote attackers to disclose or plant cookies via crafted hostnames. SetCookie::matchesDomain() tests raw Domain text before transport canonicalization, so hexadecimal, mixed-base, and percent-escaped addresses retain subdomain scope. Exploitation requires enabled cookie support, a noncanonical origin spelling, and access to a matching private, split-horizon, or container-zone hostname.

The record

CVE
CVE-2026-69245
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
Guzzle
Product
Guzzle
Classifications
CWE-180, CWE-346, CWE-384, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.15.2
  2. Affected versionversion=>= 8.0.0, < 8.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Guzzle · Guzzleversion=< 7.15.2; version=>= 8.0.0, < 8.0.1

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-180Incorrect Behavior Order: Validate Before Canonicalize
CWE-346Origin Validation Error
CWE-384Session Fixation
T1539Steal Web Session Cookie

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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