CVE-2026-33810

MEDIUM

5.9

CVSS v3

Description

When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issued by a root CA in the VerifyOptions.Roots CertPool, or in the system certificate pool.

CWE-295Improper Certificate Validation CWE-1289

How to fix

Remediation Available

stdlibGo

Fixed in:1.26.2GO-2026-4866

buildahRocky

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

buildahRed Hat / RHEL

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

buildah-debuginfoRed Hat / RHEL

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

buildah-debuginfoRocky

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

buildah-debugsourceRed Hat / RHEL

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

buildah-debugsourceRocky

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

buildah-testsRed Hat / RHEL

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

buildah-testsRocky

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

buildah-tests-debuginfoRed Hat / RHEL

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

buildah-tests-debuginfoRocky

Fixed in:2:1.43.1-5.el10_2RHSA-2026:63332

candlepinRocky

Fixed in:0:4.7.5-1.el9satRHSA-2026:34365

candlepinRed Hat / RHEL

Fixed in:0:4.7.5-1.el9satRHSA-2026:34365

candlepin-selinuxRed Hat / RHEL

Fixed in:0:4.7.5-1.el9satRHSA-2026:34365

candlepin-selinuxRocky

Fixed in:0:4.7.5-1.el9satRHSA-2026:34365

collectd-sensubilityRed Hat / RHEL

Fixed in:0:0.2.1-1.1.el8ostRHSA-2026:54757

collectd-sensubilityRocky

Fixed in:0:0.2.1-1.1.el8ostRHSA-2026:54757

collectd-sensubility-debuginfoRocky

Fixed in:0:0.2.1-1.1.el8ostRHSA-2026:54757

collectd-sensubility-debuginfoRed Hat / RHEL

Fixed in:0:0.2.1-1.1.el8ostRHSA-2026:54757

cryostat/cryostatRed Hat / RHEL

Fixed in:rhel9-operator@sha256:c4a8388737cd5330176421462353b4253dcbf4c7dc963b644b5d122cda3022d1_arm64RHSA-2026:14391

Fixed in:operator-bundle@sha256:b2a02cd673f7dd96218aa92a11bb924eb4538060f77fb8e773d0f13f5bdec55f_arm64RHSA-2026:14391

Fixed in:operator-bundle@sha256:5479230ed1ace22b8f00141796326cae84a772b1b6f14f52a58366a9695266da_amd64RHSA-2026:14391

Fixed in:rhel9-operator@sha256:b3c9c59b462a94d181b51ee7419c5e89618da06bb70d7905f7efeeca12e57c6b_amd64RHSA-2026:14391

Fixed in:storage-rhel9@sha256:95938fed3fcf7e786bcc418e5cc05999519336dd9b1ae26ac09b87d122244ce9_amd64RHSA-2026:14391

Fixed in:rhel9@sha256:6daca9dff828394e3181355526276fdc6448eace218fc3c30b63b992bee5424d_arm64RHSA-2026:14391

Fixed in:db-rhel9@sha256:231d5f0956e242c675b2f33df01d7a1fd9f44c9ee80f2b05731a60e0022e1483_arm64RHSA-2026:14391

Fixed in:rhel9@sha256:548ef61d03e7b861bed4b2f86cb826add8fcf13251d34562a4ac78302eae9d88_amd64RHSA-2026:14391

cryostat/cryostatRocky

Fixed in:rhel9-operator@sha256:b3c9c59b462a94d181b51ee7419c5e89618da06bb70d7905f7efeeca12e57c6b_amd64RHSA-2026:14391

Fixed in:storage-rhel9@sha256:95938fed3fcf7e786bcc418e5cc05999519336dd9b1ae26ac09b87d122244ce9_amd64RHSA-2026:14391

Fixed in:operator-bundle@sha256:5479230ed1ace22b8f00141796326cae84a772b1b6f14f52a58366a9695266da_amd64RHSA-2026:14391

Fixed in:operator-bundle@sha256:b2a02cd673f7dd96218aa92a11bb924eb4538060f77fb8e773d0f13f5bdec55f_arm64RHSA-2026:14391

Fixed in:db-rhel9@sha256:231d5f0956e242c675b2f33df01d7a1fd9f44c9ee80f2b05731a60e0022e1483_arm64RHSA-2026:14391

Fixed in:rhel9-operator@sha256:c4a8388737cd5330176421462353b4253dcbf4c7dc963b644b5d122cda3022d1_arm64RHSA-2026:14391

Fixed in:db-rhel9@sha256:8c6ca482631927526d6e8d1ca455cffc379d798c7d8d323c699e7ffc5ff44c88_amd64RHSA-2026:14391

Fixed in:storage-rhel9@sha256:95c41160b310ef0c54ddab4fd77dfaf02faf62de58d15b3a90b375c76226181c_arm64RHSA-2026:14391

cryostat/cryostat-agentRocky

Fixed in:init-rhel9@sha256:f2aeac65f02f6d21b497972087a808104100b547d92ab1a5656d91b48262c97d_amd64RHSA-2026:14391

Fixed in:init-rhel9@sha256:f0b40e2312ae2659f9d0092a98488d7c5965ab33efe759ce78778b1b8173c5d6_arm64RHSA-2026:14391

cryostat/cryostat-agentRed Hat / RHEL

Fixed in:init-rhel9@sha256:f0b40e2312ae2659f9d0092a98488d7c5965ab33efe759ce78778b1b8173c5d6_arm64RHSA-2026:14391

Fixed in:init-rhel9@sha256:f2aeac65f02f6d21b497972087a808104100b547d92ab1a5656d91b48262c97d_amd64RHSA-2026:14391

cryostat/cryostat-grafanaRed Hat / RHEL

Fixed in:dashboard-rhel9@sha256:2e68b360df2e9532458e97127a16e10765c3e7bbe4842d6ad48febca834af1f2_arm64RHSA-2026:14391

Fixed in:dashboard-rhel9@sha256:e0092c9adc9bf671729ec2a4682f3c53f1f12a9fdf09edf5f5c4b65172e04742_amd64RHSA-2026:14391

cryostat/cryostat-grafanaRocky

Fixed in:dashboard-rhel9@sha256:2e68b360df2e9532458e97127a16e10765c3e7bbe4842d6ad48febca834af1f2_arm64RHSA-2026:14391

Fixed in:dashboard-rhel9@sha256:e0092c9adc9bf671729ec2a4682f3c53f1f12a9fdf09edf5f5c4b65172e04742_amd64RHSA-2026:14391

cryostat/cryostat-openshift-consoleRocky

Fixed in:plugin-rhel9@sha256:5d356babef136df86f11f77ec595d9e9cc9a7f246eeb458e062757e273a9e803_amd64RHSA-2026:14391

Fixed in:plugin-rhel9@sha256:03b2d5ec8747fa2984b4659b0d61c5dd67dd729c6957918752b8033a3e6f40ec_arm64RHSA-2026:14391

cryostat/cryostat-openshift-consoleRed Hat / RHEL

Fixed in:plugin-rhel9@sha256:5d356babef136df86f11f77ec595d9e9cc9a7f246eeb458e062757e273a9e803_amd64RHSA-2026:14391

Fixed in:plugin-rhel9@sha256:03b2d5ec8747fa2984b4659b0d61c5dd67dd729c6957918752b8033a3e6f40ec_arm64RHSA-2026:14391

cryostat/jfrRocky

Fixed in:datasource-rhel9@sha256:914d1985a1944cf4c25530b67aad321e7a8d6f28cfb7793b703b69456deecf8a_arm64RHSA-2026:14391

Fixed in:datasource-rhel9@sha256:965a1522fc45c8aeff07508ba9291919bd007318da0511ee2ed4e4c18190ec71_amd64RHSA-2026:14391

cryostat/jfrRed Hat / RHEL

Fixed in:datasource-rhel9@sha256:965a1522fc45c8aeff07508ba9291919bd007318da0511ee2ed4e4c18190ec71_amd64RHSA-2026:14391

Fixed in:datasource-rhel9@sha256:914d1985a1944cf4c25530b67aad321e7a8d6f28cfb7793b703b69456deecf8a_arm64RHSA-2026:14391

erlangRed Hat / RHEL

Fixed in:0:23.3.4.18-2.el8ostRHSA-2026:54757

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.34%probability of exploitation in 30 days

27thpercentile

Low risk: more likely to be exploited than 27% of all known CVEs.

References

Patch1

go.dev

Vendor Advisory1

pkg.go.dev

Issue Tracking1

go.dev

Mailing List1

groups.google.com

Other references46

Related Vulnerabilities

Other CWE-295 (Improper Certificate Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-4000	Low	3.7	100%	-	Fix
CVE-2020-0601	High	8.1	89%	KEV	Fix
CVE-2009-3555	Critical	9.8	87%	-	Fix
CVE-2022-26923	High	8.8	84%	KEV	Fix
CVE-2023-27823	Critical	9.8	54%	-	-
CVE-2022-42979	High	8.8	24%	-	-

Common questions

How do I fix CVE-2026-33810?

Published advisories record a fix for 653 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-33810 being actively exploited?

Not that we know of. CVE-2026-33810 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.34% is the estimated probability that it will be exploited in the next 30 days. That is higher than 27% of all scored CVEs.

How severe is CVE-2026-33810?

CVE-2026-33810 has a CVSS v3 base score of 5.9, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-33810 affect?

Published advisories record a fix for stdlib (Go), buildah (Rocky), buildah (Red Hat / RHEL), buildah-debuginfo (Red Hat / RHEL), and 649 more. The list on this page is capped, so there may be more.

Embed a live status badge for CVE-2026-33810

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-18.