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Vulnerability Intelligence Report
stale proxy password leak

CVE-2026-9079

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.

No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:1.06%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
Authentication
Weaponization
SSVC Action

Weaknesses (CWE)

CWE-522 ↗Insufficiently Protected Credentials

Affected Products & Versions

Vendor Product Affected Versions
curl curl 8.8.0 < 8.14.2 (affected), 8.15.0 < 8.16.1 (affected), 8.17.0 < 8.20.1 (affected)
curl curl d5e83eb745762f48d8fafadc5df5dd3ae8d8941e < 88c7e16cceec816a2df45c899d49b1e85513f193 (affected)
curl curl 8.20.0 (affected), 8.19.0 (affected), 8.18.0 (affected), 8.17.0 (affected), 8.16.0 (affected), 8.15.0 (affected), 8.14.1 (affected), 8.14.0 (affected), 8.13.0 (affected), 8.12.1 (affected), 8.12.0 (affected), 8.11.1 (affected), 8.11.0 (affected), 8.10.1 (affected), 8.10.0 (affected), 8.9.1 (affected), 8.9.0 (affected), 8.8.0 (affected)

References & Technical Advisories

No reference links found.

Threat Intelligence Signals

EPSS Score
1.064%

Identity & Timeline

StatusPUBLISHED
Assigning Authoritycurl · Open Source · Sweden
Reserved2026-05-20T12:59:41
Published2026-07-03T06:16:51
Last Updated2026-09-15T06:03:28

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