CVE-2026-78186

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory (severity: LOW) published 2026-08-24. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw has been found in Open5GS up to 2.8.0. This affects an unknown function of the file src/hss/hss-cx-path.c of the component HSS. This manipulation of the argument User-Name causes reachable assertion. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: c9abe09421eb99bbf1cd7862a3d375e58a4eb9e4. It is recommended to apply a patch to fix this issue.

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

August 24, 2026

Last Modified

August 24, 2026

Advisory Details (3)

Auto-updated Aug 24, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

GitHub - open5gs/open5gs: Open5GS is a C-language Open Source implementation for 5G Core and EPC, i.e. the core network of LTE/NR network (Release-19) · GitHub

https://github.com/open5gs/open5gs/
github_commit

commit c9abe09421eb (open5gs/open5gs)

Fix landed in open5gs/open5gs commit c9abe09421eb — awaiting tagged release

https://github.com/open5gs/open5gs/commit/c9abe09421eb99bbf1cd7862a3d375e58a4eb9e4
generic

[Bug]: Cx MAR/SAR - HSS abort (assertion) on an empty User-Name · Issue #4675 · open5gs/open5gs · GitHub

https://github.com/open5gs/open5gs/issues/4675

Vendor Advisories for CVE-2026-78186(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 17× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-26 14:47 UTCEPSS rescore
  2. 2026-08-26 13:35 UTCGHSA enrichment
  3. 2026-08-25 15:10 UTCEG score recompute
  4. 2026-08-25 15:09 UTCGHSA enrichment
  5. 2026-08-25 13:49 UTCEPSS rescore
  6. 2026-08-24 16:46 UTCGHSA enrichment
  7. 2026-08-24 15:23 UTCEG score recompute
  8. 2026-08-24 15:23 UTCGHSA enrichment
  9. 2026-08-24 15:23 UTCNVD updateCVSS v4 → 2.1
  10. 2026-08-24 14:21 UTCEG score recompute
  11. 2026-08-24 14:21 UTCGHSA enrichment
  12. 2026-08-24 14:21 UTCMITRE cvelistV5CVSS v4 → 5.3
  13. 2026-08-24 14:18 UTCEPSS rescore
  14. 2026-08-24 05:24 UTCEG score recompute
  15. 2026-08-24 05:23 UTCNVD updateCVSS v4 → 2.1
  16. 2026-08-24 04:32 UTCEG score recompute
  17. 2026-08-24 04:30 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78186?
CVE-2026-78186 is a medium vulnerability published on August 24, 2026. A flaw has been found in Open5GS up to 2.8.0. This affects an unknown function of the file src/hss/hss-cx-path.c of the component HSS. This manipulation of the argument User-Name causes reachable assertion. The attack is possible to be carried out remotely. The exploit has been published and may be…
When was CVE-2026-78186 disclosed?
CVE-2026-78186 was first published in the National Vulnerability Database on August 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78186 actively exploited?
CVE-2026-78186 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.1% of all scored CVEs.
What is the CVSS score of CVE-2026-78186?
CVE-2026-78186 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-78186?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78186, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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