NRF service crash via unmatched OAuth2 form key
Published Aug 27, 2026 · Updated Aug 27, 2026
Improper input validation in free5GC 4.0.1 allows remote attackers to crash the NRF service through a crafted OAuth2 token request. The OAuth2 handler maps each form key to a request-structure field, but an unmatched key leaves the field name empty and reflection type nil before Set is called on a zero value. The published reproducer requires no credentials or user interaction, and successful exploitation terminates the NRF process.
Summary
What happened
Improper input validation in free5GC 4.0.1 allows remote attackers to crash the NRF service through a crafted OAuth2 token request. The OAuth2 handler maps each form key to a request-structure field, but an unmatched key leaves the field name empty and reflection type nil before Set is called on a zero value. The published reproducer requires no credentials or user interaction, and successful exploitation terminates the NRF process.
The record
- CVE
- CVE-2026-30064
- Published
- Aug 27, 2026
- Updated
- Aug 27, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 27, 2026CVE publishedPublication date reported by the CVE source.
- Aug 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- OAuth2 unmatched-form-key crash reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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