Vulnerability Report

CVE-2026-8927

Title: Environment Variable Proxy Auth Header Leak

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-8927.

CWE Category NVD-CWE-noinfo

Published Date Jul 03, 2026

Modified Date Jul 07, 2026

Exploit Status Not Found

Score 9.1 CVSS v

Exploit Probability (EPSS)

0.75%

Vulnerability Summary

CVE-2026-8927: 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`.

Impacted Vendors

haxx 1

Reference Links

https://curl.se/docs/CVE-2026-8927.html https://curl.se/docs/CVE-2026-8927.json https://hackerone.com/reports/3744543

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity CRITICAL

9.1

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-8927 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

July 07, 2026 MODIFIED

Vulnerability data updated via NVD.

July 06, 2026 MODIFIED

Vulnerability data updated via NVD.

July 03, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Stack

No specific products linked.