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

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No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Go standard library net unaffected
Version Status Constraints
0 affected < 1.25.10
1.26.0-0 affected < 1.26.3

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Advisories

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Fixes

Solution

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Workaround

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References
Link Providers
https://go.dev/cl/767860 cve-icon cve-icon
https://go.dev/issue/78803 cve-icon cve-icon
https://groups.google.com/g/golang-announce/c/qcCIEXso47M cve-icon cve-icon
https://pkg.go.dev/vuln/GO-2026-4981 cve-icon cve-icon
History

Thu, 07 May 2026 21:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-415

Thu, 07 May 2026 20:00:00 +0000

Type Values Removed Values Added
Description When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
Title Crash when handling long CNAME response in net
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-05-07T19:41:19.285Z

Reserved: 2026-03-23T20:35:32.814Z

Link: CVE-2026-33811

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-07T20:16:42.770

Modified: 2026-05-07T20:38:04.860

Link: CVE-2026-33811

cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-05-07T21:30:25Z

Weaknesses

No weakness.