High 7.5Published May 7, 2026

CVE-2026-33811Crash when handling long CNAME response in net

Updated under an hour ago (Oct 28, 2026, 5:20 PM ET)

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It affects Go standard library net and 59 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Go standard library net

Exploited in the last 30 days

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

CVSS: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-415, CWE-1341
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Go
NVD analysis: Modified
Record last updated: Sep 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Go standard library net go_standard_library:net (from the name)	before 1.25.10; from 1.26.0-0 before 1.26.3	CNA record
Red Hat Cryostat 4 on RHEL 9 redhat:cryostat	from 4.2.0-19 not affected	CISA ADP
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 redhat:ansible_automation_platform	from 0:1.6.6-1.el8ap not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:1.26.3-4.el10_2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 0:1.26.5-1.el10_0 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_els	from 0:0.11-1.el7_9 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions redhat:rhel_e4s	from 0:1.26.5-1.el9_2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus	from 0:1.26.5-1.el9_6 not affected	CISA ADP
Red Hat Red Hat OpenShift Container Platform 4.14 redhat:openshift	from 0:0.19.0-5.rhaos4.14.el8 not affected	CISA ADP
Red Hat Red Hat OpenStack Platform 16.2 redhat:openstack	from 0:0.2.1-1.1.el8ost not affected	CISA ADP
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References

References

https://go.dev/issue/78803	issue-tracking
https://go.dev/cl/767860	patch
https://groups.google.com/g/golang-announce/c/qcCIEXso47M	mailing-list, third-party-advisory
https://pkg.go.dev/vuln/GO-2026-4981	vendor-advisory
https://access.redhat.com/errata/RHSA-2026:22112
https://access.redhat.com/errata/RHSA-2026:22120
https://access.redhat.com/errata/RHSA-2026:22121
https://access.redhat.com/errata/RHSA-2026:23262
https://access.redhat.com/errata/RHSA-2026:23264
https://access.redhat.com/errata/RHSA-2026:33120
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.