What is CVE-2026-5773?

CVE-2026-5773 is a high-severity vulnerability in Curl, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2026-05-13.

How severe is CVE-2026-5773?

High severity. CVSS v3 base score is 7.5 out of 10.

SSRF in Curl

CVE-2026-5773

libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (5.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Curl — versions 8.19.0, 8.18.0, 8.17.0
Haxx Curl

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

2499f714-1537-4658-8207-48ae4bb9eae9 (Vendor Advisory)
2499f714-1537-4658-8207-48ae4bb9eae9 (Patch, Vendor Advisory)
2499f714-1537-4658-8207-48ae4bb9eae9 (Exploit, Third Party Advisory, Issue Tracking)
af854a3a-2127-422b-91ae-364da2661108 (Patch, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-5773?: CVE-2026-5773 is a high-severity vulnerability in Curl, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2026-05-13.
How severe is CVE-2026-5773?: High severity. CVSS v3 base score is 7.5 out of 10.