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CVE-2026-8927

env-set cross-proxy Digest auth state leak

Published: Jul 3, 2026Updated: Jul 7, 2026 Sources: CVE List NVDCWE-294
9.1CRITICAL
NVD MITRE
EPSS Score
0.4%
Top 63.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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`.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA: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:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-294

Affected Products

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

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Defense Evasion
View detailed technique mapping

References

https://curl.se/docs/CVE-2026-8927.html
curl.se
https://curl.se/docs/CVE-2026-8927.json
curl.se
https://hackerone.com/reports/3744543
hackerone.com
News mentions
1

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