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CVE-2026-9546

sending old referer

Published: Jul 3, 2026Updated: Jul 7, 2026 Sources: CVE List NVDNVD-CWE-noinfo
7.5HIGH
NVD MITRE
EPSS Score
0.4%
Top 67.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

A vulnerability in libcurl caused the HTTP `Referer:` header to persist even when explicitly cleared. While the documentation states that passing NULL to `CURLOPT_REFERER` suppresses the header, the option failed to clear the internal state. As a result the previous referrer string was erroneously reused and sent in subsequent requests, potentially leaking sensitive information to unintended servers.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

NVD-CWE-noinfo

Affected Products

curl
oss-project·USaka wcurl, libcurl
curlLibraryLibrary
OSS Libraries / generic-library
haxx
oss-project·SEaka haxx.se
curl
OSS Libraries

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-9546?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://curl.se/docs/CVE-2026-9546.json
curl.se
https://curl.se/docs/CVE-2026-9546.html
curl.se
https://hackerone.com/reports/3754343
hackerone.com
News mentions
1

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