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CVE-2026-18924

9.1 · CRITICAL

A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process.

Published Sep 6, 2026haxxCWE-416EPSS 0.58%

Overview

CVE-2026-18924 is a critical-severity vulnerability affecting haxx curl. It was published on September 6, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent

handle is set to share connections with other handles, can lead to

use-after-free in the cleanup process.

Remediation

Check the references section for vendor advisories and patches from haxx. Update curl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
haxxcurl>= 7.44.0, < 8.22.0Affected

References

Refcurl.se/docs/CVE-2026-18924.htmlRefcurl.se/docs/CVE-2026-18924.jsonRefhackerone.com/reports/3916059Refhackerone.com/reports/3916059

How CyberStrike helps

Frequently asked questions

What is CVE-2026-18924?

CVE-2026-18924 is a critical-severity vulnerability affecting haxx curl. It was published on September 6, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-18924?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-18924?

Check the references section for vendor advisories and patches from haxx. Update curl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-18924?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-18924 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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