guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer
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.
CVE-2026-67354
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-67354
guzzle
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "guzzle",
"product": "guzzle",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "7.15.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.15.1",
"versionType": "semver"
}
],
"packageURL": "pkg:composer/guzzlehttp/guzzle",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-67354
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #12817 · Revision 1
- Added to Heist Feed
- Publisher date