OPENSUSE-SU-2026:21927-1: apptainer security update

OPENSUSE-SU-2026:21927-1, released September 21, 2026, fixes 6 CVEs in apptainer (version 1.5.3-bp160.4.1). None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

7.5

Base score, 0 to 10

Highest EPSS

0.0064

51st percentile

Priority of the 6 CVEs

Patch now 0
                                Urgent 0
                                High 4
                                Routine 2

Fixed package versions

Product	Release	Fixed in
apptainer	opensuse-leap 16.0	1.5.3-bp160.4.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-84445	gRPC-Go: Denial of Service (DoS) via crash due to missing `:authority` and `Host` headers in the xDS servers	7.5	0.0064	None reported
High	CVE-2026-56855	Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh	7.5	0.0050	None reported
High	CVE-2026-56854	golang-go.crypto: The source-address critical option in the Permissions returned by an authentication callback was only enforced for th...	7.5	0.0044	None reported
High	CVE-2026-78662	Prevent DoS on deadlocked undecided channel in golang.org/x/crypto/ssh	7.5	0.0043	None reported
Routine	CVE-2026-84304	gRPC-Go: Heap Memory Exhaustion (OOM) via HTTP/2 DATA Frame Fragmentation	4.4	0.0061	None reported
Routine	CVE-2026-84303	gRPC-Go: xDS RBAC HTTP Filter bypass via mixed-case Header Matching and gRFC A41 validation evasion	n/a	0.0031	None reported

Also fixes CVE-2026-84445

OPENSUSE-SU-2026:21897-1
govulncheck-vulndb on opensuse-leap 16.0
SUSE-SU-2026:23863-1
govulncheck-vulndb on sles 16.0
OPENSUSE-SU-2026:22224-1
rqlite on opensuse-leap 16.0
OPENSUSE-SU-2026:21996-1
v2ray-core on opensuse-leap 16.0
SUSE-SU-2026:4270-1
google-guest-agent on sles 15.6, sles 15.7
RHSA-2026:91646
osbuild-composer on RHEL 10
SUSE-SU-2026:4293-1
google-osconfig-agent on sles 15.6, sles 15.7
OPENSUSE-SU-2026:21882-1
google-osconfig-agent on opensuse-leap 16.0

Vendor advisory

https://osv.dev/vulnerability/openSUSE-SU-2026:21927-1

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