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CVE-2026-11856— cross-origin 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 7.10.6版本至8.20.0及之前版本存在授权问题漏洞，该漏洞源于在处理Digest认证时，复用同一句柄将HTTP原始值从hostA更改至hostB，导致libcurl错误地将原本属于hostA的Authorization标头字段传递给hostB。

AI Predicted 5.4 Difficulty: Easy EPSS 0.69% · P51

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 176

VendorProduct Version RangeStatus
curl curl 7.10.6< 8.14.2 affected
8.15.0< 8.16.1 affected
8.17.0< 8.20.1 affected
334d78cd18a7310144383929bdcef34ffbf6159b< 5c6b4880357ab3e72967c1c45cae0f96ffabc535 affected
8.20.0 affected
8.19.0 affected
8.18.0 affected
8.17.0 affected
… +168 more rows
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I. Basic Information for CVE-2026-11856

Vulnerability Information
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Vulnerability Title
cross-origin Digest auth state leak
Source: CVE Program / CVE List V5
Vulnerability Description
Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.
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 7.10.6版本至8.20.0及之前版本存在授权问题漏洞，该漏洞源于在处理Digest认证时，复用同一句柄将HTTP原始值从hostA更改至hostB，导致libcurl错误地将原本属于hostA的Authorization标头字段传递给hostB。
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

Vendor Product Affected Versions CPE Subscribe
curl curl 7.10.6 ~ 8.14.2 -
curl curl 334d78cd18a7310144383929bdcef34ffbf6159b ~ 5c6b4880357ab3e72967c1c45cae0f96ffabc535 -
curl curl 8.20.0 -

II. Public POCs for CVE-2026-11856

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III. Intelligence Information for CVE-2026-11856

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Vendor Advisories for CVE-2026-11856 (2)

Exploits & Public PoCs for CVE-2026-11856 (1)

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-2026-9546 sending old referer
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-2026-11586 WS Auto-PONG memory exhaustion

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-294

V. Comments for CVE-2026-11856

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