What’s Vulnerable › Vulnerabilities

CVE-2026-18924: HTTP/2 server push UAF

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-06 · updated 2026-09-15
• Weakness: CWE-416

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.

Affected products

• curl: from 7.44.0 before 8.22.0 — fixed in 8.22.0

How to fix

Upgrade to a fixed version: curl 8.22.0. Check the vendor advisory for mitigations.

References

• https://curl.se/docs/CVE-2026-18924.html
• https://curl.se/docs/CVE-2026-18924.json
• https://hackerone.com/reports/3916059
• https://hackerone.com/reports/3916059

Get alerted when CVE-2026-18924 or the next vulnerability affects your stack