Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8
- https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-discl
FAQ
What is CVE-2026-67354?
CVE-2026-67354 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ...
How severe is CVE-2026-67354?
CVE-2026-67354 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67354?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.