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
haxx: curl
References4
- curl.se/docs/CVE-2026-18924.html PatchVendor Advisory
- curl.se/docs/CVE-2026-18924.json Vendor Advisory
- hackerone.com/reports/3916059 ExploitMitigationThird Party Advisory
- hackerone.com/reports/3916059 ExploitMitigationThird Party Advisory
Metrics
- CVSS 3.1
-
9.1
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H - EPSS — exploit probability
- 1% percentile: 48 · as of 3 November 2026
- CWE
- CWE-416
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.