CVE-2026-55784

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

free5GC is an open-source implementation of the 5G core network. In version 1.4.4 and earlier, the AUSF component stores per-subscriber authentication state in a global sync.Map named AUSFContext.UePool in internal/context/context.go, keyed only by SUPI. Every request handled by internal/sbi/processor/ue_authentication.go creates an AusfUeContext, and AddAusfUeContextToPool executes ausfContext.UePool.Store(ausfUeContext.Supi, ausfUeContext), unconditionally replacing the active context for that SUPI. An attacker with access to the AUSF SBI/N12 interface can send concurrent POST /nausf-auth/v1/ue-authentications requests for the same target SUPI, causing all attempts to share one logical authentication context URL while K_aut, XRES, and EapID are repeatedly overwritten. A valid EAP-AKA' response for an earlier challenge is then checked against the latest context, causing AT_MAC verification to fail and denying authentication to the selected subscriber while the request flood continues. No fixed version is available as of this review.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

August 28, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

free5GC AUSF authentication contexts can be overwritten by concurrent requests for the same SUPI · Advisory · free5gc/free5gc · GitHub

https://github.com/free5gc/free5gc/security/advisories/GHSA-334q-h5g3-fpxv

Vendor Advisories for CVE-2026-55784(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
gogithub.com/free5gc/ausf—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/free5gc/ausf———

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 88× 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. 2026-09-19 07:00 UTCGHSA enrichment
  2. 2026-09-18 19:36 UTCEG score recompute
  3. 2026-09-18 19:36 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 08:13 UTCGHSA enrichment
  6. 2026-09-17 20:50 UTCEG score recompute
  7. 2026-09-17 20:50 UTCGHSA enrichment
  8. 2026-09-17 19:31 UTCEPSS rescore
  9. 2026-09-17 06:47 UTCGHSA enrichment
  10. 2026-09-16 18:57 UTCEG score recompute
  11. 2026-09-16 18:57 UTCGHSA enrichment
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-16 04:54 UTCGHSA enrichment
  15. 2026-09-15 17:31 UTCGHSA enrichment
  16. 2026-09-15 06:08 UTCEG score recompute
  17. 2026-09-15 06:08 UTCGHSA enrichment
  18. 2026-09-15 03:11 UTCEPSS rescore
  19. 2026-09-14 18:45 UTCGHSA enrichment
  20. 2026-09-14 07:08 UTCGHSA enrichment
  21. 2026-09-13 19:46 UTCEG score recompute
  22. 2026-09-13 19:46 UTCGHSA enrichment
  23. 2026-09-13 16:47 UTCEPSS rescore
  24. 2026-09-13 08:23 UTCGHSA enrichment
  25. 2026-09-12 21:01 UTCEG score recompute
Show 63 more
  1. 2026-09-12 21:01 UTCGHSA enrichment
  2. 2026-09-12 09:38 UTCGHSA enrichment
  3. 2026-09-11 22:15 UTCEG score recompute
  4. 2026-09-11 22:15 UTCGHSA enrichment
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 10:50 UTCEG score recompute
  7. 2026-09-11 10:50 UTCGHSA enrichment
  8. 2026-09-10 23:08 UTCGHSA enrichment
  9. 2026-09-10 11:45 UTCEG score recompute
  10. 2026-09-10 11:45 UTCGHSA enrichment
  11. 2026-09-10 09:35 UTCEPSS rescore
  12. 2026-09-09 23:52 UTCGHSA enrichment
  13. 2026-09-09 08:36 UTCEG score recompute
  14. 2026-09-09 08:36 UTCGHSA enrichment
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-08 21:13 UTCGHSA enrichment
  17. 2026-09-08 07:19 UTCGHSA enrichment
  18. 2026-09-07 19:56 UTCEG score recompute
  19. 2026-09-07 19:56 UTCGHSA enrichment
  20. 2026-09-07 16:01 UTCEPSS rescore
  21. 2026-09-07 08:32 UTCGHSA enrichment
  22. 2026-09-06 21:07 UTCEG score recompute
  23. 2026-09-06 21:07 UTCGHSA enrichment
  24. 2026-09-06 13:47 UTCEPSS rescore
  25. 2026-09-06 09:40 UTCGHSA enrichment
  26. 2026-09-05 22:18 UTCEG score recompute
  27. 2026-09-05 22:18 UTCGHSA enrichment
  28. 2026-09-05 10:53 UTCGHSA enrichment
  29. 2026-09-04 23:30 UTCEG score recompute
  30. 2026-09-04 23:30 UTCGHSA enrichment
  31. 2026-09-04 11:24 UTCEG score recompute
  32. 2026-09-04 11:24 UTCGHSA enrichment
  33. 2026-09-04 05:07 UTCEPSS rescore
  34. 2026-09-04 00:00 UTCGHSA enrichment
  35. 2026-09-03 12:37 UTCGHSA enrichment
  36. 2026-09-03 01:15 UTCEG score recompute
  37. 2026-09-03 01:15 UTCGHSA enrichment
  38. 2026-09-02 14:12 UTCEPSS rescore
  39. 2026-09-02 13:52 UTCGHSA enrichment
  40. 2026-09-02 02:29 UTCGHSA enrichment
  41. 2026-09-01 15:04 UTCEG score recompute
  42. 2026-09-01 15:04 UTCGHSA enrichment
  43. 2026-09-01 13:54 UTCEPSS rescore
  44. 2026-09-01 04:40 UTCEPSS rescore
  45. 2026-09-01 03:33 UTCEG score recompute
  46. 2026-09-01 03:32 UTCGHSA enrichment
  47. 2026-09-01 02:41 UTCEG score recompute
  48. 2026-09-01 02:41 UTCGHSA enrichment
  49. 2026-08-31 19:54 UTCGHSA enrichment
  50. 2026-08-31 08:31 UTCGHSA enrichment
  51. 2026-08-30 21:02 UTCEG score recompute
  52. 2026-08-30 21:01 UTCGHSA enrichment
  53. 2026-08-30 19:17 UTCEPSS rescore
  54. 2026-08-30 09:38 UTCEG score recompute
  55. 2026-08-30 09:38 UTCGHSA enrichment
  56. 2026-08-30 01:22 UTCEPSS rescore
  57. 2026-08-29 22:13 UTCGHSA enrichment
  58. 2026-08-29 10:50 UTCGHSA enrichment
  59. 2026-08-28 23:25 UTCEG score recompute
  60. 2026-08-28 23:24 UTCGHSA enrichment
  61. 2026-08-28 22:35 UTCEG score recompute
  62. 2026-08-28 22:35 UTCGHSA enrichment
  63. 2026-08-28 22:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55784?
CVE-2026-55784 is a high vulnerability published on August 28, 2026. free5GC is an open-source implementation of the 5G core network. In version 1.4.4 and earlier, the AUSF component stores per-subscriber authentication state in a global sync.Map named AUSFContext.UePool in internal/context/context.go, keyed only by SUPI. Every request handled by…
When was CVE-2026-55784 disclosed?
CVE-2026-55784 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55784 actively exploited?
CVE-2026-55784 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 82.9% of all scored CVEs.
What is the CVSS score of CVE-2026-55784?
CVE-2026-55784 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-55784?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55784, 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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