CVE-2026-78186

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM 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 — 3 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: 0.5%CVSS: 4.3Exploit: Elevated riskExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

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
4.3MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 21× in last 7d / 82× 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.

Showing the most recent 100 of 139 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-10 13:16 UTCEG score recompute
  3. 2026-10-10 13:15 UTCGHSA enrichment
  4. 2026-10-09 20:07 UTCEPSS rescore
  5. 2026-10-09 05:01 UTCEG score recompute
  6. 2026-10-09 05:01 UTCGHSA enrichment
  7. 2026-10-08 17:13 UTCEPSS rescore
  8. 2026-10-08 04:18 UTCEG score recompute
  9. 2026-10-08 04:18 UTCGHSA enrichment
  10. 2026-10-07 23:48 UTCEPSS rescore
  11. 2026-10-07 01:21 UTCEG score recompute
  12. 2026-10-07 01:21 UTCGHSA enrichment
  13. 2026-10-06 15:18 UTCEPSS rescore
  14. 2026-10-06 02:57 UTCEG score recompute
  15. 2026-10-06 02:57 UTCGHSA enrichment
  16. 2026-10-05 17:43 UTCEPSS rescore
  17. 2026-10-05 01:56 UTCEG score recompute
  18. 2026-10-05 01:56 UTCGHSA enrichment
  19. 2026-10-04 23:22 UTCEPSS rescore
  20. 2026-10-04 03:32 UTCEG score recompute
  21. 2026-10-04 03:32 UTCGHSA enrichment
  22. 2026-10-03 14:26 UTCEPSS rescore
  23. 2026-10-03 05:08 UTCEG score recompute
  24. 2026-10-03 05:08 UTCGHSA enrichment
  25. 2026-10-02 06:43 UTCEG score recompute
Show 75 more
  1. 2026-10-02 06:43 UTCGHSA enrichment
  2. 2026-10-01 19:50 UTCEPSS rescore
  3. 2026-10-01 05:43 UTCEG score recompute
  4. 2026-10-01 05:43 UTCGHSA enrichment
  5. 2026-09-30 07:19 UTCEG score recompute
  6. 2026-09-30 07:19 UTCGHSA enrichment
  7. 2026-09-29 15:24 UTCEPSS rescore
  8. 2026-09-28 21:34 UTCEG score recompute
  9. 2026-09-28 21:34 UTCGHSA enrichment
  10. 2026-09-28 13:52 UTCEPSS rescore
  11. 2026-09-27 23:10 UTCEG score recompute
  12. 2026-09-27 23:10 UTCGHSA enrichment
  13. 2026-09-27 13:48 UTCEPSS rescore
  14. 2026-09-27 00:46 UTCEG score recompute
  15. 2026-09-27 00:46 UTCGHSA enrichment
  16. 2026-09-26 15:59 UTCEPSS rescore
  17. 2026-09-26 00:28 UTCEPSS rescore
  18. 2026-09-25 01:19 UTCEG score recompute
  19. 2026-09-25 01:19 UTCGHSA enrichment
  20. 2026-09-24 14:04 UTCEPSS rescore
  21. 2026-09-24 02:54 UTCEG score recompute
  22. 2026-09-24 02:54 UTCGHSA enrichment
  23. 2026-09-23 17:54 UTCEPSS rescore
  24. 2026-09-23 04:30 UTCEG score recompute
  25. 2026-09-23 04:30 UTCGHSA enrichment
  26. 2026-09-22 16:01 UTCEPSS rescore
  27. 2026-09-22 06:06 UTCEG score recompute
  28. 2026-09-22 06:06 UTCGHSA enrichment
  29. 2026-09-21 21:09 UTCEPSS rescore
  30. 2026-09-21 07:41 UTCEG score recompute
  31. 2026-09-21 07:41 UTCGHSA enrichment
  32. 2026-09-20 20:16 UTCEPSS rescore
  33. 2026-09-20 08:50 UTCEG score recompute
  34. 2026-09-20 08:50 UTCGHSA enrichment
  35. 2026-09-19 10:08 UTCEG score recompute
  36. 2026-09-19 10:08 UTCGHSA enrichment
  37. 2026-09-18 19:28 UTCEPSS rescore
  38. 2026-09-18 11:39 UTCEG score recompute
  39. 2026-09-18 11:39 UTCGHSA enrichment
  40. 2026-09-17 13:08 UTCGHSA enrichment
  41. 2026-09-16 14:17 UTCEG score recompute
  42. 2026-09-16 14:17 UTCGHSA enrichment
  43. 2026-09-16 14:08 UTCEPSS rescore
  44. 2026-09-16 05:15 UTCEPSS rescore
  45. 2026-09-15 15:12 UTCEG score recompute
  46. 2026-09-15 15:12 UTCGHSA enrichment
  47. 2026-09-15 03:12 UTCEPSS rescore
  48. 2026-09-15 03:12 UTCEPSS rescore
  49. 2026-09-14 16:40 UTCGHSA enrichment
  50. 2026-09-13 18:16 UTCEG score recompute
  51. 2026-09-13 18:16 UTCGHSA enrichment
  52. 2026-09-12 19:52 UTCEG score recompute
  53. 2026-09-12 19:52 UTCGHSA enrichment
  54. 2026-09-11 21:28 UTCEG score recompute
  55. 2026-09-11 21:28 UTCGHSA enrichment
  56. 2026-09-11 14:53 UTCEPSS rescore
  57. 2026-09-11 14:53 UTCEPSS rescore
  58. 2026-09-10 23:04 UTCEG score recompute
  59. 2026-09-10 23:03 UTCGHSA enrichment
  60. 2026-09-10 09:35 UTCEPSS rescore
  61. 2026-09-10 00:38 UTCGHSA enrichment
  62. 2026-09-09 01:35 UTCEG score recompute
  63. 2026-09-09 01:34 UTCGHSA enrichment
  64. 2026-09-08 22:01 UTCEPSS rescore
  65. 2026-09-07 18:57 UTCEG score recompute
  66. 2026-09-07 18:57 UTCGHSA enrichment
  67. 2026-09-06 20:33 UTCEG score recompute
  68. 2026-09-06 20:33 UTCGHSA enrichment
  69. 2026-09-06 13:48 UTCEPSS rescore
  70. 2026-09-05 22:09 UTCEG score recompute
  71. 2026-09-05 22:09 UTCGHSA enrichment
  72. 2026-09-04 23:45 UTCEG score recompute
  73. 2026-09-04 23:45 UTCGHSA enrichment
  74. 2026-09-04 05:07 UTCEPSS rescore
  75. 2026-09-03 23:59 UTCGHSA enrichment

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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 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 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-78186?
CVE-2026-78186 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-78186?
An upstream fix for CVE-2026-78186 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-78186 are linked in the Vendor Advisories panel on this page.

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