CVE-2026-9079 in libcURL

Summary

by MITRE • 07/03/2026

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.

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• Responsible: Curl
• Reservation: 05/20/2026
• Disclosure: 07/03/2026
• Moderation: accepted
• Entry: VDB-376075
• CPE: ready
• CWE: CWE-522 (confirmed)
• CVSS: 4.3 (VulDB)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Pharma, Energy, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-9079
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9079
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-9079/