CVE-2026-8927— env-set cross-proxy Digest auth state leak
Quick assessment
Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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存在授权问题漏洞，该漏洞源于libcurl在处理由环境变量代理配置驱动的顺序传输时，未能清除请求间的代理认证状态，导致针对proxyA的Digest认证凭据可能被泄露给后续路由到的proxyB。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud StorageAffected Version Matrix 170
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I. Basic Information for CVE-2026-8927
Vulnerability Information
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Vulnerability Title
env-set cross-proxy Digest auth state leak
Source: CVE Program / CVE List V5
Vulnerability Description
When reusing a libcurl handle for sequential transfers driven by
environment-variable proxy configuration, libcurl fails to clear the proxy
authentication state between requests. Specifically, if the initial transfer
authenticates against `proxyA` using Digest auth, a subsequent transfer routed
through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended
solely for `proxyA`.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
curl 授权问题漏洞
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存在授权问题漏洞，该漏洞源于libcurl在处理由环境变量代理配置驱动的顺序传输时，未能清除请求间的代理认证状态，导致针对proxyA的Digest认证凭据可能被泄露给后续路由到的proxyB。
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-2026-8927
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-8927 (2)
Proof of Concept for CVE-2026-8927 (1)
Same Patch Batch · curl · 2026-07-03 · 18 CVEs total
| CVE-2026-9546 | sending old referer | |
| 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-2026-8926 | 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-2026-10536 | HTTP/2 stream-dependency tree UAF | |
| 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
Same weakness: CWE-294
-
CVE-2026-105485
Devolutions Server认证绕过漏洞（2026.3.7.0及更早版本） -
CVE-2026-9226
Devolutions Server认证绕过漏洞 -
CVE-2026-73636
Apache HTTP Server: mod_auth_digest one-time-nonce replay at -
CVE-2026-103655
MISP TOTP Code Replay Allows Duplicate Authentication Within -
CVE-2026-82379
Apache Roller: WSSE digest authentication headers can be rep
V. Comments for CVE-2026-8927
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