CVE Tools
Sign in

CVE-2026-33811

Crash when handling long CNAME response in net

Published: May 7, 2026Updated: Aug 7, 2026 Sources: CVE List NVD BDUCWE-415
7.5HIGH
NVD MITRE
EPSS Score
0.8%
Top 46.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-415CWE-1341

Affected Products

The Go Project
oss-projectaka crypto, golang-google-protobuf, go
Go
OSS Libraries
Go standard library
oss-project·USaka golang standard library, crypto/x509, net/http, html/template
netLibraryLibrary
OSS Libraries / go
golang
oss-project·US
go
OSS Libraries

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-33811?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://go.dev/cl/767860
go.dev
https://go.dev/issue/78803
go.dev
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
groups.google.com
and 74 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-33811 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows