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TI-2026-47650 Aliases CVE-2026-67354GHSA-h95v-h523-3mw8

guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer

Priority LOW 36CWE-201Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-201.

Summary

guzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware. When the optional allow_redirects.referer setting is enabled, the middleware copies the URI fragment (the portion after '#') from the referring request into the generated Referer header when following a same-scheme redirect (e.g., HTTPS to HTTPS). An attacker who controls the redirect destination can read this fragment from the incoming Referer header, potentially disclosing one-time login secrets, access tokens, state values, or other sensitive client data to a server never meant to receive it. The referer setting is disabled by default. Fixed in 7.15.1, which strips the fragment before generating the Referer value.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00372 31st percentileScored 2026-11-07
Fix Fixed guzzle (guzzle): 7.15.1guzzlehttp/guzzle (Packagist): 7.15.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
guzzleguzzlebefore 7.15.17.15.1Patch availableCNA
—guzzlehttp/guzzle (Packagist)before 7.15.17.15.1Patch availableGHSA-h95v-h523-3mw8
  • guzzle Vendorguzzle Affected before 7.15.1 Fixed in 7.15.1 Patch available CNA
  • guzzlehttp/guzzle (Packagist) Vendor— Affected before 7.15.1 Fixed in 7.15.1 Patch available GHSA-h95v-h523-3mw8

Remediation

  • Fix · CNA guzzle (guzzle) Fixed in 7.15.1
  • Fix · GHSA-h95v-h523-3mw8 guzzlehttp/guzzle (Packagist) Fixed in 7.15.1 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    guzzle 7.15.1

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-47649 guzzlehttp/guzzle before 7.15.1 Unbounded Cookie Denial of ServicePriority LOW 37
    • TI-2026-47651 guzzlehttp/guzzle before 7.15.1 Host-only Cookie ScopePriority LOW 36
    Show all 3 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-67354
  2. 2026-10-03 Alias added: GHSA-h95v-h523-3mw8

References

Advisory 2

Other 4

  • TI-2022-08589 Improper Input Validation in guzzlehttp/psr7 CVSS 3.1HIGH 7.5
  • TI-2022-13088 Fix failure to strip Authorization header on HTTP downgrade in Guzzle CVSS 3.1HIGH 7.5
  • TI-2022-13087 Failure to strip the Cookie header on change in host or HTTP downgrade in Guzzle CVSS 3.1HIGH 7.5
  • TI-2023-13898 Laminas Diactoros vulnerable to HTTP Multiline Header Termination CVSS 3.1HIGH 7.5
  • TI-2022-11789 Cross-domain cookie leakage in Guzzle CVSS 3.1HIGH 8.1
  • TI-2026-48585 Guzzle: Noncanonical host can bypass host-based checks CVSS 3.1HIGH 7.2
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences