CVE-2026-7009

Description

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.

CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-295 CWE-295

Affected Products

Vendor	Product	Versions
haxx	curl	8.17.0 — 8.20.0

References

Advisories & Patches

https://curl.se/docs/CVE-2026-7009.html https://hackerone.com/reports/3694390 http://www.openwall.com/lists/oss-security/2026/04/29/12 https://hackerone.com/reports/3694390

Exploits

https://hackerone.com/reports/3694390 https://hackerone.com/reports/3694390

Other References

https://curl.se/docs/CVE-2026-7009.json

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-7009? +

CVE-2026-7009 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-7009? +

CVE-2026-7009 affects products from haxx, specifically: curl. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-7009? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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