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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-67354
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:39 UTC · Revision 1
Source evidence
guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer
core-osv · Original sourcePublished 1 Aug 2026, 12:22 UTC
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.
osv:CVE-2026-67354
Complete source record
{
"id": "8b62871e5635098df968ceacc406b85e5df3c9e88ea2950018652e119237dd00",
"url": "https://osv.dev/vulnerability/CVE-2026-67354",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer",
"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.",
"evidence": "osv:CVE-2026-67354",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-67354",
"aliases": [
"CVE-2026-67354",
"GHSA-h95v-h523-3mw8"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/guzzle/guzzle",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
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}
],
"database_specific": {
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{
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"introduced": "0"
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{
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"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
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},
{
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"source": "DESCRIPTION"
}
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}
}
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"v1.0.1",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67354.json"
}
}
],
"modified": "2026-10-28T02:30:37.350230986Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67354.json",
"https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8",
"https://nvd.nist.gov/vuln/detail/CVE-2026-67354",
"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer"
],
"provider_metadata": {
"cwe_ids": [
"CWE-201"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67354.json"
}
},
"related_cves": [
{
"value": "CVE-2026-67354",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504791,
"published_at": "2026-08-01T12:22:18.324+00:00"
}