What is CVE-2026-7009?

CVE-2026-7009 is a medium-severity vulnerability in Curl, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-05-13.

How severe is CVE-2026-7009?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Curl

CVE-2026-7009

When curl is told to use the Certificate Status Request TLS extension, often referred to as *OCSP stapling*, to verify that the server certificate is valid, it fails to detect OCSP problems and instead wrongly consider the response as fine.

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (2.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Curl — versions 8.19.0, 8.18.0, 8.17.0
Haxx Curl

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

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

Frequently asked questions

What is CVE-2026-7009?: CVE-2026-7009 is a medium-severity vulnerability in Curl, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2026-05-13.
How severe is CVE-2026-7009?: Medium severity. CVSS v3 base score is 5.3 out of 10.