CVE-2026-33811
Crash when handling long CNAME response in net
HIGH
7.5
CVSS Score
Published: May 7, 2026 at 07:41 PM UTC
Updated: October 26, 2026 at 12:10 AM UTC
45 products affected across 3 vendorsGo.NETEnterprise Linux
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Severity
HIGH7.5
Exploit prediction
EPSS 0.9%
SSVC
No known exploit
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 1.25.101.26.0 ≤ v < 1.26.3
Affected range stops below 1.25.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.26.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.25.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.26.3, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 1786908301 (unaffected)
Vendor states this is fixed in 2 (unaffected)
60%
All versions
All versions
Connectivity Link· Red Hatcontainer
60%Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (133)
Mailing ListThird Party Advisory
Source: cverecord
https://groups.google.com/g/golang-announce/c/qcCIEXso47MSource: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:23262Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:23264Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:33120Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:33123SSVC — Action Prioritization
SSVCNo known exploitAutomatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.5HIGHCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-415CWE-1341
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