CVE-2026-9546— sending old referer
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-9546
Vulnerability Information
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Vulnerability Title
sending old referer
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
curl 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
curl是瑞典cURL团队开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl存在信息泄露漏洞，该漏洞源于libcurl中HTTP `Referer:`标头在明确清除时仍会持久化，当传递NULL给`CURLOPT_REFERER`时未能清除内部状态，导致前一referrer字符串错误地被重用并在后续请求中发送，可能将敏感信息泄露给非预期的服务器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-9546
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Vendor Advisories for CVE-2026-9546 (1)
Other References for CVE-2026-9546 (2)
Same Patch Batch · curl · 2026-07-03 · 18 CVEs total
| CVE-2026-10536 | HTTP/2 stream-dependency tree UAF | |
| CVE-2026-8932 | incomplete mTLS config matching in conn reuse | |
| CVE-2026-8458 | wrong reuse for different services | |
| CVE-2026-8925 | SASL double-free | |
| CVE-2026-8286 | wrong STARTTLS connection reuse | |
| CVE-2026-8927 | env-set cross-proxy Digest auth state leak | |
| CVE-2026-8926 | password leak with netrc and user in URL | |
| CVE-2026-8924 | trailing dot domain super cookie | |
| CVE-2026-12064 | proto-default skips SSH verification | |
| CVE-2026-11352 | QUIC zero-length UDP datagrams busy-loop | |
| CVE-2026-9545 | exposing HTTP/3 early data | |
| CVE-2026-9080 | UAF after pause in socket callback | |
| CVE-2026-9547 | SSH improper host validation | |
| CVE-2026-9079 | stale proxy password leak | |
| CVE-2026-11564 | Native CA trust persist | |
| CVE-2026-11856 | cross-origin Digest auth state leak | |
| CVE-2026-11586 | WS Auto-PONG memory exhaustion |
IV. Related Vulnerabilities
V. Comments for CVE-2026-9546
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