curl 8.18.0-1ubuntu2.3: curl 8.18.0-1ubuntu2.3 for Ubuntu 26.04.1 LTS (resolute)

curl 8.18.0-1ubuntu2.3, released June 24, 2026, fixes 5 CVEs in curl. None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0101

63rd percentile

Priority of the 5 CVEs

Patch now 0
                                Urgent 1
                                High 4
                                Routine 0

Fixed package versions

Product	Release	Fixed in
curl	Ubuntu 26.04.1 LTS (resolute)	8.18.0-1ubuntu2.3

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-11564	curl: libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them match...	9.1	0.0061	None reported
High	CVE-2026-11352	curl: An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service a...	7.5	0.0101	None reported
High	CVE-2026-11586	curl: By default, curl automatically responds to WebSocket PING frames	7.5	0.0086	None reported
High	CVE-2026-10536	HTTP/2 stream-dependency tree UAF	9.8	0.0060	None reported
High	CVE-2026-12064	proto-default skips SSH verification	7.5	0.0041	None reported

Also fixes CVE-2026-11564

SUSE-SU-2026:5068-1
curl on sles 15.7
SUSE-SU-2026:5069-1
curl on sles 15.6
libcurl3t64-gnutls 8.18.0-1ubuntu2.3
libcurl3t64-gnutls on Ubuntu 26.04.1 LTS (resolute)
libcurl4t64 8.18.0-1ubuntu2.3
libcurl4t64 on Ubuntu 26.04.1 LTS (resolute)
DEBIAN-CVE-2026-11564
curl on Debian 14

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