CVE-2026-55784

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

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

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
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
34th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 28, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
No fix on record yet. Sources: github.
GitHub advisoryMentions a patch (unverified)

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
github.com/free5gc/ausf—
  • every version through 1.4.4: no fix on record
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 106× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 175 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 75 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  9. 2026-10-10 12:12 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  10. 2026-10-10 00:47 UTCEG score recompute
  11. 2026-10-10 00:47 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  13. 2026-10-09 02:36 UTCEG score recompute
  14. 2026-10-09 02:36 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  15. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  16. 2026-10-08 00:47 UTCEG score recompute
  17. 2026-10-08 00:47 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  19. 2026-10-07 06:12 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-10-06 18:49 UTCEG score recompute
  21. 2026-10-06 18:49 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  22. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  23. 2026-10-06 07:27 UTCEG score recompute
  24. 2026-10-06 07:27 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  25. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
Show 75 more
  1. 2026-10-05 16:49 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  2. 2026-10-05 03:39 UTCEG score recompute
  3. 2026-10-05 03:39 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  4. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  5. 2026-10-04 16:12 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  6. 2026-10-04 04:47 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  7. 2026-10-03 17:24 UTCEG score recompute
  8. 2026-10-03 17:23 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  10. 2026-10-03 06:01 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  11. 2026-10-02 18:33 UTCEG score recompute
  12. 2026-10-02 18:33 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  13. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  14. 2026-10-02 07:11 UTCEG score recompute
  15. 2026-10-02 07:11 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  17. 2026-10-01 19:48 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-10-01 07:10 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  19. 2026-09-30 19:48 UTCEG score recompute
  20. 2026-09-30 19:48 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  22. 2026-09-30 03:48 UTCEG score recompute
  23. 2026-09-30 03:48 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  24. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  25. 2026-09-29 08:29 UTCEG score recompute
  26. 2026-09-29 08:29 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  27. 2026-09-28 21:07 UTCEG score recompute
  28. 2026-09-28 21:07 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  29. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  30. 2026-09-28 05:34 UTCEG score recompute
  31. 2026-09-28 05:34 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  32. 2026-09-27 18:12 UTCEG score recompute
  33. 2026-09-27 18:12 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  34. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  35. 2026-09-27 06:48 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  36. 2026-09-26 19:25 UTCEG score recompute
  37. 2026-09-26 19:25 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  38. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  39. 2026-09-26 08:02 UTCEG score recompute
  40. 2026-09-26 08:02 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  41. 2026-09-25 12:33 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  42. 2026-09-25 01:11 UTCEG score recompute
  43. 2026-09-25 01:11 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  45. 2026-09-24 13:48 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  46. 2026-09-24 02:25 UTCEG score recompute
  47. 2026-09-24 02:25 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  48. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  49. 2026-09-23 15:03 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  50. 2026-09-23 03:40 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  51. 2026-09-22 16:18 UTCEG score recompute
  52. 2026-09-22 16:18 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  53. 2026-09-22 04:41 UTCEG score recompute
  54. 2026-09-22 04:41 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-09-21 17:17 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  56. 2026-09-21 05:11 UTCEG score recompute
  57. 2026-09-21 05:11 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  58. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  59. 2026-09-20 17:16 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  60. 2026-09-20 05:46 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  61. 2026-09-19 18:23 UTCEG score recompute
  62. 2026-09-19 18:23 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  63. 2026-09-19 07:00 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-09-18 19:36 UTCEG score recompute
  65. 2026-09-18 19:36 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  66. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  67. 2026-09-18 08:13 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  68. 2026-09-17 20:50 UTCEG score recompute
  69. 2026-09-17 20:50 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  70. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  71. 2026-09-17 06:47 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-09-16 18:57 UTCEG score recompute
  73. 2026-09-16 18:57 UTCGHSA enrichmentGHSA-334q-h5g3-fpxv · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  75. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 16th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-55784?
CVE-2026-55784 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-55784 published?
The CVE record for CVE-2026-55784 was published on August 28, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 8, 2026; the record at its source may have been updated since.
Is CVE-2026-55784 actively exploited?
CVE-2026-55784 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55784?
CVE-2026-55784 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55784?
No fix for CVE-2026-55784 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-55784 are linked in the Vendor Advisories panel on this page.

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