CVE-2026-9079NVD

Vulnerability Summary

libcurl had a flaw that when instructed to clear proxy authentication
credentials which made it not do so, leaving the old credentials around to get
used for subsequent transfers that should not know nor use them.

Severity Level

CRITICAL(9.8)

Published Date

Jul 3, 2026

Last Modified

Jul 7, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.58%Probability

Root Weakness (CWE)

CWE-522: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 9.8 (CRITICAL)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Haxx Curl >= 8.8.0 and < 8.21.0

Patched Versions

Haxx Curl 8.21.0

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