CVE-2026-18924 - Vulnerability Details - OpenCVE

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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact partial

Vendors	Products
Curl	Curl

No data.

No data.

References

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

History

Tue, 08 Sep 2026 16:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'}` ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sun, 06 Sep 2026 20:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Curl Curl curl
Weaknesses		CWE-416
Vendors & Products		Curl Curl curl

Sun, 06 Sep 2026 18:00:00 +0000

Type	Values Removed	Values Added
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.
Title		HTTP/2 server push UAF
References		https://curl.se/docs/CVE-2026-18924.html https://curl.se/docs/CVE-2026-18924.json https://hackerone.com/reports/3916059

MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-09-06T17:47:27.820Z

Updated: 2026-09-08T15:41:24.050Z

Reserved: 2026-08-05T08:31:56.125Z

Link: CVE-2026-18924

Vulnrichment

Updated: 2026-09-08T15:41:19.299Z

NVD

Status : Undergoing Analysis

Published: 2026-09-06T18:17:20.553

Modified: 2026-09-08T16:18:06.000

Link: CVE-2026-18924

Redhat

No data.

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