CVE-2026-8731

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

Score 4.3 from GitHub Security Advisory (severity: LOW) published 2026-05-17. NVD baseline CVSS 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.3Exploit: NoneExposed: 0

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

A vulnerability has been found in Open5GS up to 2.7.7. Affected is the function ogs_sbi_client_add in the library /lib/sbi/client.c of the component NRF. The manipulation of the argument client_pool leads to denial of service. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3
4.3
EG Score
4.3(medium)
EPSS
30.1%
KEV
Not listed

Published

May 17, 2026

Last Modified

May 18, 2026

Advisory Details (2)

Auto-updated Jun 17, 2026
No patch confirmed yet.
generic

[Bug]: NRF crash on `POST /nnrf-nfm/v1/subscriptions` by exhausting the SBI client pool · Issue #4464 · open5gs/open5gs · GitHub

https://github.com/open5gs/open5gs/issues/4464
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-17) · GitHub

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

Vendor Advisories for CVE-2026-8731(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 9× in last 7d / 55× 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. 2026-07-12 05:46 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-09 19:10 UTCEPSS rescore
  4. 2026-07-08 15:16 UTCEPSS rescore
  5. 2026-07-07 13:46 UTCEPSS rescore
  6. 2026-07-06 16:27 UTCEPSS rescore
  7. 2026-07-06 16:27 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-06 02:23 UTCEPSS rescore
  10. 2026-07-05 02:31 UTCEPSS rescore
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-01 15:07 UTCEPSS rescore
  15. 2026-06-30 23:22 UTCEPSS rescore
  16. 2026-06-29 21:15 UTCEG score recompute
  17. 2026-06-29 21:15 UTCGHSA enrichment
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-28 14:07 UTCEPSS rescore
  20. 2026-06-28 04:56 UTCEPSS rescore
  21. 2026-06-27 21:37 UTCEG score recompute
  22. 2026-06-27 21:37 UTCGHSA enrichment
  23. 2026-06-27 03:08 UTCEPSS rescore
  24. 2026-06-26 20:02 UTCEG score recompute
  25. 2026-06-26 20:02 UTCGHSA enrichment
Show 75 more
  1. 2026-06-25 18:33 UTCEG score recompute
  2. 2026-06-25 18:33 UTCGHSA enrichment
  3. 2026-06-25 13:50 UTCEPSS rescore
  4. 2026-06-24 14:05 UTCEPSS rescore
  5. 2026-06-23 21:33 UTCEPSS rescore
  6. 2026-06-22 14:25 UTCEPSS rescore
  7. 2026-06-21 14:56 UTCEPSS rescore
  8. 2026-06-21 01:59 UTCEPSS rescore
  9. 2026-06-19 19:26 UTCEPSS rescore
  10. 2026-06-18 17:52 UTCEPSS rescore
  11. 2026-06-18 04:49 UTCEG score recompute
  12. 2026-06-18 04:49 UTCGHSA enrichment
  13. 2026-06-17 17:53 UTCEPSS rescore
  14. 2026-06-17 03:40 UTCEG score recompute
  15. 2026-06-17 03:40 UTCGHSA enrichment
  16. 2026-06-16 17:53 UTCEPSS rescore
  17. 2026-06-16 02:35 UTCEG score recompute
  18. 2026-06-16 02:35 UTCGHSA enrichment
  19. 2026-06-15 17:49 UTCEPSS rescore
  20. 2026-06-15 17:49 UTCEPSS rescore
  21. 2026-06-15 00:10 UTCEG score recompute
  22. 2026-06-15 00:10 UTCGHSA enrichment
  23. 2026-06-14 23:18 UTCEPSS rescore
  24. 2026-06-13 23:06 UTCEG score recompute
  25. 2026-06-13 23:06 UTCGHSA enrichment
  26. 2026-06-13 23:00 UTCEPSS rescore
  27. 2026-06-12 23:12 UTCEPSS rescore
  28. 2026-06-12 23:12 UTCEPSS rescore
  29. 2026-06-12 17:53 UTCEG score recompute
  30. 2026-06-12 17:52 UTCGHSA enrichment
  31. 2026-06-11 16:48 UTCEG score recompute
  32. 2026-06-11 16:48 UTCGHSA enrichment
  33. 2026-06-11 14:00 UTCEPSS rescore
  34. 2026-06-10 22:19 UTCEPSS rescore
  35. 2026-06-10 14:59 UTCEG score recompute
  36. 2026-06-10 14:59 UTCGHSA enrichment
  37. 2026-06-10 13:22 UTCEPSS rescore
  38. 2026-06-09 13:55 UTCEG score recompute
  39. 2026-06-09 13:55 UTCGHSA enrichment
  40. 2026-06-08 14:17 UTCEPSS rescore
  41. 2026-06-08 12:51 UTCEG score recompute
  42. 2026-06-08 12:51 UTCGHSA enrichment
  43. 2026-06-07 15:25 UTCEPSS rescore
  44. 2026-06-07 11:47 UTCEG score recompute
  45. 2026-06-07 11:47 UTCGHSA enrichment
  46. 2026-06-06 13:47 UTCEPSS rescore
  47. 2026-06-06 10:43 UTCEG score recompute
  48. 2026-06-06 10:43 UTCGHSA enrichment
  49. 2026-06-05 22:47 UTCEPSS rescore
  50. 2026-06-05 09:40 UTCEG score recompute
  51. 2026-06-05 09:40 UTCGHSA enrichment
  52. 2026-06-05 06:10 UTCEPSS rescore
  53. 2026-06-04 13:12 UTCEPSS rescore
  54. 2026-06-04 08:36 UTCEG score recompute
  55. 2026-06-04 08:36 UTCGHSA enrichment
  56. 2026-06-03 07:32 UTCEG score recompute
  57. 2026-06-03 07:32 UTCGHSA enrichment
  58. 2026-06-02 20:13 UTCEPSS rescore
  59. 2026-06-02 06:27 UTCEG score recompute
  60. 2026-06-02 06:27 UTCGHSA enrichment
  61. 2026-06-01 13:52 UTCEPSS rescore
  62. 2026-06-01 05:23 UTCEG score recompute
  63. 2026-06-01 05:23 UTCGHSA enrichment
  64. 2026-05-31 22:30 UTCEPSS rescore
  65. 2026-05-31 00:16 UTCEPSS rescore
  66. 2026-05-29 13:44 UTCEPSS rescore
  67. 2026-05-28 13:44 UTCEPSS rescore
  68. 2026-05-27 13:40 UTCEPSS rescore
  69. 2026-05-26 13:44 UTCEPSS rescore
  70. 2026-05-26 07:18 UTCEPSS rescore
  71. 2026-05-21 22:43 UTCEPSS rescore
  72. 2026-05-20 22:38 UTCEPSS rescore
  73. 2026-05-20 11:54 UTCEG score recompute
  74. 2026-05-20 11:54 UTCGHSA enrichment
  75. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8731?
CVE-2026-8731 is a medium vulnerability published on May 17, 2026. A vulnerability has been found in Open5GS up to 2.7.7. Affected is the function ogssbiclientadd in the library /lib/sbi/client.c of the component NRF. The manipulation of the argument clientpool leads to denial of service. It is possible to initiate the attack remotely. The exploit has been…
When was CVE-2026-8731 disclosed?
CVE-2026-8731 was first published in the National Vulnerability Database on May 17, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8731 actively exploited?
CVE-2026-8731 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8731?
CVE-2026-8731 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-8731?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8731, 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.

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