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CVE-2026-71676 Open5GS CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-18T20:17:24.917Z and has not been modified since then. This CVE-2026-71676 vulnerability, classified as a Buffer Overflow, affects Open5GS version 2.7.0. It allows a remote attacker to cause a denial of service via the NAS 5GS decoder chain. The vulnerability is triggered when the message type byte of a NAS PDU is mutated. Network administrators and security teams should review configurations, verify NAS 5GS decoder chain settings, and ensure Open5GS is up-to-date. Limited detail is available on affected scope and vendor remediation, emphasizing the need for defenders to verify Open5GS installations and review NAS 5GS decoder chain configurations.

Vendor
Open5GS
Product
Open5GS
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-18
Original CVE updated
2026-08-31
Advisory published
2026-08-18
Advisory updated
2026-08-31

Who should care

Network administrators and security teams responsible for Open5GS installations should review and verify their configurations to prevent potential exploitation. This includes verifying NAS 5GS decoder chain configurations, monitoring for unusual NAS PDU message type byte mutations, and ensuring that Open5GS installations are up-to-date with the latest security patches. Additionally, operators and platform administrators should assess their exposure and implement compensating controls as needed.

Technical summary

Buffer Overflow vulnerability in Open5GS v.2.7.0 NAS 5GS decoder chain allows remote attacker to cause denial of service. The vulnerability is triggered when the message type byte of a NAS PDU is mutated. This issue affects Open5GS installations, particularly those using version 2.7.0. A denial of service vulnerability can have significant operational impact, emphasizing the need for prompt review and mitigation.

Defensive priority

High-priority defensive review recommended due to potential denial of service vulnerability in Open5GS.

Recommended defensive actions

  • Review Open5GS v.2.7.0 installation for potential exposure
  • Verify NAS 5GS decoder chain configuration
  • Monitor for unusual NAS PDU message type byte mutations

Evidence notes

Evidence from official CVE Program record and NIST NVD detail page indicates a buffer overflow vulnerability in Open5GS v.2.7.0. Limited detail available on affected scope and vendor remediation. Defenders should verify Open5GS installations, review NAS 5GS decoder chain configurations, and monitor for unusual NAS PDU message type byte mutations. Additional review of vendor guidance and potential exposure is recommended.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-71676 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-71676

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-71676 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-71676

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.