CVE-2026-18924

HTTP/2 server push UAF

CVE-2026-18924 is fixed in 6 products on 1 platform, first by curl 8.18.0-1ubuntu2.7, released September 6, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

9.1

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0058

48th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
curl · Debian 14	8.22.0~rc2-1	DEBIAN-CVE-2026-18924	Sep 19, 2026
curl · Ubuntu 18.04.6 LTS (bionic)	7.58.0-2ubuntu3.24+esm14	curl 7.58.0-2ubuntu3.24+esm14	Sep 28, 2026
curl · Ubuntu 20.04 LTS (focal)	7.68.0-1ubuntu2.25+esm9	curl 7.68.0-1ubuntu2.25+esm9	Sep 28, 2026
curl · Ubuntu 22.04.1 LTS (jammy)	7.81.0-1ubuntu1.29	curl 7.81.0-1ubuntu1.29	Sep 28, 2026
curl · Ubuntu 24.04.5 LTS (noble)	8.5.0-2ubuntu10.15	curl 8.5.0-2ubuntu10.15	Sep 28, 2026
curl · Ubuntu 26.04.1 LTS (resolute)	8.18.0-1ubuntu2.7	curl 8.18.0-1ubuntu2.7	Sep 6, 2026
curl · sles 15.6	8.22.0-150600.4.58.1	SUSE-SU-2026:5069-1	Nov 7, 2026
curl · sles 15.7	8.22.0-150700.7.33.1	SUSE-SU-2026:5068-1	Nov 7, 2026
libcurl3-gnutls · Ubuntu 18.04.6 LTS (bionic)	7.58.0-2ubuntu3.24+esm14	libcurl3-gnutls 7.58.0-2ubuntu3.24+esm14	Sep 28, 2026
libcurl3-gnutls · Ubuntu 20.04 LTS (focal)	7.68.0-1ubuntu2.25+esm9	libcurl3-gnutls 7.68.0-1ubuntu2.25+esm9	Sep 28, 2026
libcurl3-gnutls · Ubuntu 22.04.1 LTS (jammy)	7.81.0-1ubuntu1.29	libcurl3-gnutls 7.81.0-1ubuntu1.29	Sep 28, 2026
libcurl3-nss · Ubuntu 18.04.6 LTS (bionic)	7.58.0-2ubuntu3.24+esm14	libcurl3-nss 7.58.0-2ubuntu3.24+esm14	Sep 28, 2026
libcurl3-nss · Ubuntu 20.04 LTS (focal)	7.68.0-1ubuntu2.25+esm9	libcurl3-nss 7.68.0-1ubuntu2.25+esm9	Sep 28, 2026
libcurl3-nss · Ubuntu 22.04.1 LTS (jammy)	7.81.0-1ubuntu1.29	libcurl3-nss 7.81.0-1ubuntu1.29	Sep 28, 2026
libcurl3t64-gnutls · Ubuntu 24.04.5 LTS (noble)	8.5.0-2ubuntu10.15	libcurl3t64-gnutls 8.5.0-2ubuntu10.15	Sep 28, 2026
libcurl3t64-gnutls · Ubuntu 26.04.1 LTS (resolute)	8.18.0-1ubuntu2.7	libcurl3t64-gnutls 8.18.0-1ubuntu2.7	Sep 6, 2026
libcurl4 · Ubuntu 18.04.6 LTS (bionic)	7.58.0-2ubuntu3.24+esm14	libcurl4 7.58.0-2ubuntu3.24+esm14	Sep 28, 2026
libcurl4 · Ubuntu 20.04 LTS (focal)	7.68.0-1ubuntu2.25+esm9	libcurl4 7.68.0-1ubuntu2.25+esm9	Sep 28, 2026
libcurl4 · Ubuntu 22.04.1 LTS (jammy)	7.81.0-1ubuntu1.29	libcurl4 7.81.0-1ubuntu1.29	Sep 28, 2026
libcurl4t64 · Ubuntu 24.04.5 LTS (noble)	8.5.0-2ubuntu10.15	libcurl4t64 8.5.0-2ubuntu10.15	Sep 28, 2026
libcurl4t64 · Ubuntu 26.04.1 LTS (resolute)	8.18.0-1ubuntu2.7	libcurl4t64 8.18.0-1ubuntu2.7	Sep 6, 2026

Details

Published
September 6, 2026
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18924

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