CVE-2026-9079

CRITICAL 9.8

stale proxy password leak

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-522
Vendor	curl
Product	curl
Published	Jul 3, 2026
Last Updated	Sep 15, 2026

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Affected Versions

curl / curl

8.8.0 < 8.14.2 8.15.0 < 8.16.1 8.17.0 < 8.20.1

curl / curl

d5e83eb745762f48d8fafadc5df5dd3ae8d8941e < 88c7e16cceec816a2df45c899d49b1e85513f193

curl / curl

8.20.0 8.19.0 8.18.0 8.17.0 8.16.0 8.15.0 8.14.1 8.14.0 8.13.0 8.12.1 8.12.0 8.11.1 8.11.0 8.10.1 8.10.0 8.9.1 8.9.0 8.8.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

curl.se: https://curl.se/docs/CVE-2026-9079.json curl.se: https://curl.se/docs/CVE-2026-9079.html hackerone.com: https://hackerone.com/reports/3750295

Credits

Guannan Wang Zhanpeng Liu Jiashuo Liang Guancheng Li Daniel Stenberg