SMF crash via unchecked PCC-rule array write
Published May 10, 2026 · Updated May 10, 2026
Buffer overflow in Open5GS 2.7.0 through 2.7.7 allows remote authenticated users to crash the SMF via a crafted policy callback. The update_authorized_pcc_rule_and_qos function writes each supplied PCC rule into an eight-entry session array and increments the index without checking its upper bound. A caller able to send an SM-policy notification for an active session can overflow the array, corrupt session state, and terminate the SMF process.
Summary
What happened
Buffer overflow in Open5GS 2.7.0 through 2.7.7 allows remote authenticated users to crash the SMF via a crafted policy callback. The update_authorized_pcc_rule_and_qos function writes each supplied PCC rule into an eight-entry session array and increments the index without checking its upper bound. A caller able to send an SM-policy notification for an active session can overflow the array, corrupt session state, and terminate the SMF process.
The record
- CVE
- CVE-2026-8251
- Published
- May 10, 2026
- Updated
- May 10, 2026
- Vendor
- Open5GS
- Product
- Open5GS
- Classifications
- T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 10, 2026CVE publishedPublication date reported by the CVE source.
- May 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.7.0
- Affected versionversion=2.7.1
- Affected versionversion=2.7.2
- Affected versionversion=2.7.3
- Affected versionversion=2.7.4
- Affected versionversion=2.7.5
- Affected versionversion=2.7.6
- Affected versionversion=2.7.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- Open5GS oversized pccRules callback reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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