# CVE-2026-30045: Open5GS integer overflow in /nnrf-disc/v1/nf-instances

Source: https://junglewise.ai/threats/cve-2026-30045-open5gs-integer-overflow-in-nnrf-disc-v1-nf-instances  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-27. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-30045 · Severity: high · CVSS 7.5 · Published 2026-08-27

Open5GS is an open-source 5G core network implementation used in telecommunications deployments. An integer overflow vulnerability in the network function repository (NRF) component allows remote attackers to crash the NRF service by sending a specially crafted HTTP/2 request with an oversized numeric parameter, causing complete service unavailability.

Technologies: [Open5GS](https://junglewise.ai/threats/technologies/open5gs). Vendors: [Open5GS](https://junglewise.ai/threats/vendors/open5gs).

## Quick answers

**Is CVE-2026-30045 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-30045 being exploited in the wild.

**How severe is CVE-2026-30045?** High severity, with a CVSS score of 7.5, published 27 August 2026.

**Which products and versions are affected?** Open5GS v2.7.6.

**Is there a fix for CVE-2026-30045?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-30045 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-30045?** Check whether you run Open5GS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an integer overflow in the /nnrf-disc/v1/nf-instances endpoint's parameter parsing logic, specifically in the `ogs_uint64_from_string()` function (in ogs-conv.c:241). When parsing the requester-features parameter, the code attempts to convert a very large numeric string (e.g., "ffffffffffffffffffffffffffffffffffffffff") to a 64-bit unsigned integer without validating bounds, causing `strtoll()` to fail with a numerical result out of range error. The application then triggers a fatal assertion that crashes the NRF process. The vulnerability is reachable remotely via unauthenticated HTTP/2 GET requests and requires no special preconditions. An attacker can achieve denial of service by repeatedly sending malicious requests to crash the NRF, disrupting 5G core network operations.

## Affected products

- Open5GS Open5GS v2.7.6

## Timeline

- 2026-08-27: disclosed: Vulnerability advisory published
- 2026-01-08: other: Vulnerability reported in GitHub issue #4263

## References

- [https://github.com/open5gs/open5gs/issues/4263](https://github.com/open5gs/open5gs/issues/4263)

## Related threats

- [Open5GS HTTP/2 SBI server memory exhaustion](https://junglewise.ai/threats/cve-2026-106806-a-memory-exhaustion-issue-exists-in-open5gs-v2-8-0-in-the-http-2)
- [open5GS PFCP transaction handling denial of service](https://junglewise.ai/threats/cve-2026-106807-a-denial-of-service-vulnerability-exists-in-open5gs-v2-8-0-in)
- [Open5GS heap out-of-bounds write in multipart parsing](https://junglewise.ai/threats/cve-2026-116543-open5gs-1-3-0-through-2-8-0-contains-a-heap-out-of-bounds-write)
- [Open5GS assertion failure in SGSN context request handling](https://junglewise.ai/threats/cve-2026-108105-open5gs-through-2-8-0-contains-a-reachable-assertion)
- [Open5GS heap out-of-bounds read in PFCP parsing](https://junglewise.ai/threats/cve-2026-108103-open5gs-through-2-8-0-contains-a-heap-out-of-bounds-read)