CVE-2026-18924CWE-416

CVE-2026-18924

Critical · published September 6, 2026

CVSS v3.1
9.1
EPSS
1%
Percentile
47.2
In the wild
Unconfirmed
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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00584 · 47.2th percentile
Weakness
CWE-416 · Use After Free
Published
2026-09-06T22:17Z
Affected products (1)
ProductVersionsFixed in
haxx/curl≥ 7.44.0, < 8.22.08.22.0
References (4)
https://curl.se/docs/CVE-2026-18924.html · 2499f714-1537-4658-8207-48ae4bb9eae9https://curl.se/docs/CVE-2026-18924.json · 2499f714-1537-4658-8207-48ae4bb9eae9https://hackerone.com/reports/3916059 · 2499f714-1537-4658-8207-48ae4bb9eae9https://hackerone.com/reports/3916059 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 08 SEP 03:22Z
    EPSS moved — → 0%
    epss
  • 06 SEP 17:47Z
    HTTP/2 server push UAF
    cvelistv5