CVE-2026-9079

stale proxy password leak

Published Jul 3, 2026 CVSS 3.1 · 9.8 Critical EPSS 1.1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-8487-1 curl vulnerabilities
History
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-255
Type Values Removed Values Added
Weaknesses CWE-255
Type Values Removed Values Added
Weaknesses CWE-256
CWE-322
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Weaknesses CWE-256
CWE-322
Type Values Removed Values Added
Weaknesses CWE-200
CWE-269
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Weaknesses CWE-200
CWE-269
Type Values Removed Values Added
Weaknesses CWE-285
CWE-287
Type Values Removed Values Added
Weaknesses CWE-285
CWE-287
Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl
Type Values Removed Values Added
Description 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.
Title stale proxy password leak
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
curl
Published
Updated
Sep 15, 2026, 6:03 AM
Reserved
May 20, 2026, 12:59 PM
Status
Modified
Published
Jul 3, 2026, 7:16 AM
Modified
Sep 15, 2026, 7:16 AM
Severity
Important
Public date
Jul 3, 2026, 6:16 AM