CVE-2026-18924

9.1 CRITICAL 0.6% exploit odds Fix listed Memory safety Server

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data tampering, service disruption.
Exploit odds: 0.6% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-09-06 18:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-09-15 07:16 UTC Last updatedMost recent change to the record

Details

Published: 2026-09-06 18:17 UTC
Last modified: 2026-09-15 07:16 UTC
Exploit probability: 0.6% · EPSS, next 30 days
Weakness: CWE-416 · Use after free
Record status: Modified

Affected

Haxx Curl < 8.22.0

Attack profile CVSS 3.1 · 9.1

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: High

Raw vector

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

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Fix and advisories

References

NVD record · CVE.org record