Use-after-free in cURL - CVE-2026-18924
Published: September 2, 2026
Vulnerability identifier: #VU146684
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-18924
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to trigger a use-after-free.
The vulnerability exists due to use-after-free in libcurl HTTP/2 server push stream handling when processing an HTTPS HTTP/2 server push on a shared connection. A remote attacker can send a server push response sequence to trigger a use-after-free.
The issue affects libcurl only and requires HTTP/2 server push to be enabled and accepted by the application, along with connection sharing.
Affected software
cURL
How to mitigate CVE-2026-18924
Install security update from vendor's website.
cURL - update to 8.22.0