OPENSUSE-SU-2026:21590-1: kubevirt1.8 security update

OPENSUSE-SU-2026:21590-1, released August 18, 2026, fixes 25 CVEs in kubevirt1.8 (version 1.8.4-160000.1.1). None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

2 rated Critical

Exploited

None reported

Highest CVSS

10.0

Base score, 0 to 10

Highest EPSS

0.0691

94th percentile

Priority of the 25 CVEs

Patch now 0
                                Urgent 2
                                High 18
                                Routine 5

Fixed package versions

Product	Release	Fixed in
kubevirt1.8	opensuse-leap 16.0	1.8.4-160000.1.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-39821	Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna	10.0	0.0183	None reported
Urgent	CVE-2026-46595	Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh	10.0	0.0056	None reported
High	CVE-2026-42508	Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts	9.1	0.0691	None reported
High	CVE-2026-33814	Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net	7.5	0.0084	None reported
High	CVE-2026-39830	Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh	9.1	0.0068	None reported
High	CVE-2026-39832	Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent	9.1	0.0068	None reported
High	CVE-2026-35469	SpdyStream: DOS on CRI	8.1	0.0066	None reported
High	CVE-2026-39834	Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh	9.1	0.0060	None reported
High	CVE-2026-46600	Parsing an invalid SVCB or HTTPS RR can panic in golang.org/x/net/dns/dnsmessage	7.5	0.0055	None reported
High	CVE-2026-39835	Invoking server panic during CheckHostKey/Authenticate in golang.org/x/crypto/ssh	8.7	0.0050	None reported
High	CVE-2026-39831	Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh	9.1	0.0048	None reported
High	CVE-2026-56852	Infinite loop on invalid input in golang.org/x/text	8.8	0.0048	None reported
High	CVE-2026-46597	Invoking byte arithmetic causes underflow and panic in golang.org/x/crypto/ssh	7.5	0.0047	None reported
High	CVE-2026-39833	Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent	9.1	0.0047	None reported
High	CVE-2026-39829	Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh	8.7	0.0047	None reported
High	CVE-2026-39828	Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh	8.8	0.0037	None reported
High	CVE-2026-25681	Invoking incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/html	8.7	0.0022	None reported
High	CVE-2026-27136	Invoking duplicate attributes can cause XSS in golang.org/x/net/html	8.7	0.0022	None reported
High	CVE-2026-42502	Invoking incorrect handling of HTML elements in foreign content in golang.org/x/net/html	8.2	0.0022	None reported
High	CVE-2026-13622	Kubevirt: virt-handler-rhel9: kubevirt: virt-handler migration proxy follows symlinks allowing container escape to host	8.8	0.0020	None reported
Routine	CVE-2026-46598	Invoking pathological inputs can lead to client panic in golang.org/x/crypto/ssh/agent	5.3	0.0041	None reported
Routine	CVE-2026-25680	Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html	6.5	0.0033	None reported
Routine	CVE-2026-13201	kubevirt: This update for kubevirt fixes the following issues: - Security update correcting a CVE over-claim from the previous...	n/a	0.0031	None reported
Routine	CVE-2026-39827	Invoking memory leak when rejecting channels can lead to DoS in golang.org/x/crypto/ssh	6.5	0.0028	None reported
Routine	CVE-2026-42506	Invoking incorrect handling of namespaced elements in foreign content in golang.org/x/net/html	6.1	0.0024	None reported

Also fixes CVE-2026-39821

OPENSUSE-SU-2026:22158-1
docker on opensuse-leap 16.0
SUSE-SU-2026:22558-1
google-osconfig-agent on sles 16.0
OPENSUSE-SU-2026:22026-1
prometheus-blackbox_exporter on opensuse-leap 16.0
SUSE-SU-2026:4606-1
golang-github-prometheus-prometheus on sles 15.7
OPENSUSE-SU-2026:21205-1
docker-stable on opensuse-leap 16.0
SUSE-SU-2026:23625-1
govulncheck-vulndb on sles 16.0
OPENSUSE-SU-2026:21761-1
govulncheck-vulndb on opensuse-leap 16.0
OPENSUSE-SU-2026:21824-1
containerized-data-importer1.65 on opensuse-leap 16.0

Vendor advisory

https://osv.dev/vulnerability/openSUSE-SU-2026:21590-1

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/fix/linux/opensuse-su-2026-21590-1">OPENSUSE-SU-2026:21590-1 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Which servers are still behind?

Patchblox compares the installed package on every Linux machine against the fixed version for its release, including machines reported through Azure Update Manager.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.