RHSA-2026:87040: golang security update

RHSA-2026:87040, released October 21, 2026, fixes 15 CVEs in golang (version 1.26.10-1.el10_0). None of them is reported as exploited. Patch Radar priority: High.

High

CVEs closed

None rated Critical

Exploited

None reported

Highest CVSS

9.1

Base score, 0 to 10

Highest EPSS

0.0087

58th percentile

Priority of the 15 CVEs

Patch now 0
                                Urgent 0
                                High 13
                                Routine 2

Fixed package versions

Product	Release	Fixed in
golang	RHEL 10	1.26.10-1.el10_0

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
High	CVE-2026-78659	HTTP/2 server memory exhaustion due to Trailer headers in net/http	7.5	0.0087	None reported
High	CVE-2026-78663	Double flow control refund on HTTP/2 server streams in net/http	9.1	0.0086	None reported
High	CVE-2026-78669	Excessive CPU consumption from repeated initial window changes in net/http	7.5	0.0085	None reported
High	CVE-2026-97031	Reject malformed ECH outer extension references in crypto/tls	7.5	0.0072	None reported
High	CVE-2026-94440	Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart	7.5	0.0071	None reported
High	CVE-2026-97032	HTTP/2 server crash due to HPACK encoder race in net/http	7.5	0.0068	None reported
High	CVE-2026-78667	Lack of limit on size of parsed Range headers in net/http	7.5	0.0066	None reported
High	CVE-2026-56866	HTTP/1 client connection desynchronization after CONNECT rejection in net/http	7.5	0.0060	None reported
High	CVE-2026-78660	HTTP/2 transport accepts malformed framing-related headers in net/http	7.5	0.0054	None reported
High	CVE-2026-94439	HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http	7.5	0.0053	None reported
High	CVE-2026-111943	Go: CVE-2026-111943 Distrust compromised intermediate certificates in crypto/x509	8.1	0.0040	None reported
High	CVE-2026-94447	Checksum database bypass for golang.org/toolchain in cmd/go	7.8	0.0010	None reported
High	CVE-2026-94444	Checksum bypass for golang.org/fips140 in cmd/go	7.8	0.0010	None reported
Routine	CVE-2026-94448	Reset context tracking on consecutive template expressions in html/template	6.1	0.0029	None reported
Routine	CVE-2026-97030	Recognize yield as regexp preceder keyword in html/template	6.1	0.0029	None reported

Also fixes CVE-2026-78659

SUSE-SU-2026:4866-1
go1.26-openssl on sles 15.6, sles 15.7
OPENSUSE-SU-2026:22093-1
go1.27 on opensuse-leap 16.0
SUSE-SU-2026:24237-1
go1.27 on sles 16.0
SUSE-SU-2026:4625-1
go1.27 on sles 15.6, sles 15.7
OPENSUSE-SU-2026:22095-1
go1.26 on opensuse-leap 16.0
SUSE-SU-2026:24239-1
go1.26 on sles 16.0
SUSE-SU-2026:4629-1
go1.26 on sles 15.6, sles 15.7
ALSA-2026:86196
go-toolset, golang, golang-bin and 5 more on almalinux 9

Vendor advisory

https://access.redhat.com/errata/RHSA-2026:87040

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