Vulnerability DatabaseCVE-2026-33811
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CVE-2026-33811
Published:May 07, 2026
Updated:May 16, 2026
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
Affected Packages
https://github.com/golang/go.git (GITHUB):
Affected version(s) >=go1.26.0 <go1.26.3
Fix Suggestion:
Update to version go1.26.3
https://github.com/golang/go.git (GITHUB):
Affected version(s) >=go1 <go1.25.10
Fix Suggestion:
Update to version go1.25.10
github.com/golang/go (GO):
Affected version(s) >=go1 <go1.25.10
Fix Suggestion:
Update to version go1.25.10
github.com/golang/go (GO):
Affected version(s) >=go1.26.0 <go1.26.3
Fix Suggestion:
Update to version go1.26.3
Related Resources (4)
https://go.dev/issue/78803
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
https://go.dev/cl/767860
https://pkg.go.dev/vuln/GO-2026-4981
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Double Free
CWE-415
EPSS
Base Score:
0.02