CVE-2026-44327

CRITICALNVD 10.010.0
EchelonGraph scoreMEDIUM confidence

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

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-08. NVD baseline CVSS 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-32571 (ENISA EUVD) · GHSA-cmpj-2x3g-m7g3 (GitHub Security Advisories)Source: ENISA EUVD

10.0EG
EchelonGraph verdictPlan a fixRemediate 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: 0.3%CVSS: 10.0Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can hit the OAM route with no Authorization header at all and the handler returns 200 OK. The current OAM handler is a stub that returns null, but the structural defect is route-group-scoped: the entire OAM route group has no inbound auth middleware, so every future OAM operation added to this group inherits the missing auth boundary by default. This vulnerability is fixed in 4.2.2.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
76
EG Risk 76/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity100% × 45%
Impact severity (EG Severity): CVSS 10.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
24th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (10.0): severity, escalated by confirmed exploitation. This CVE's 10.0 is its impact severity (EG Severity), not escalated.

EG Severity
10.0 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-30). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

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

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

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

May 27, 2026

Last Modified

October 14, 2026

Advisory Details (3)

Auto-updated Oct 30, 2026
🔬 Proof of concept available. Fix named in the CVE record. Sources: github, github_pr.
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler · Advisory · free5gc/free5gc · GitHub

https://github.com/free5gc/free5gc/security/advisories/GHSA-cmpj-2x3g-m7g3
GitHub pull request

fix(sbi): enforce inbound OAuth2 on NEF service routes

Upstream fix in progress (PR #23 · free5gc/nef, state=closed)

https://github.com/free5gc/nef/pull/23
Web page

[Bugs] NEF `nnef-oam` is unauthenticated: no-token requests can access the OAM route · Issue #861 · free5gc/free5gc · GitHub

https://github.com/free5gc/free5gc/issues/861

Vendor Advisories for CVE-2026-44327(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/nef—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/nef—
  • every version through 1.2.3: no fix on record
  • every version on: no fix on record
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 72× 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 424 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 324 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 20:50 UTCEG score recompute
  2. 2026-10-30 20:50 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  3. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  4. 2026-10-29 19:31 UTCEG score recompute
  5. 2026-10-29 19:31 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-10-28 18:12 UTCEG score recompute
  8. 2026-10-28 18:12 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  9. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-10-27 16:48 UTCEG score recompute
  11. 2026-10-27 16:48 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  12. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  14. 2026-10-26 15:25 UTCEG score recompute
  15. 2026-10-26 15:25 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  16. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  17. 2026-10-25 14:27 UTCEG score recompute
  18. 2026-10-25 13:24 UTCEG score recompute
  19. 2026-10-25 13:24 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  20. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  21. 2026-10-24 12:03 UTCEG score recompute
  22. 2026-10-24 12:03 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  23. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-10-23 10:43 UTCEG score recompute
  25. 2026-10-23 10:42 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
Show 75 more
  1. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-10-22 09:21 UTCEG score recompute
  3. 2026-10-22 09:20 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  4. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-21 08:00 UTCEG score recompute
  6. 2026-10-21 08:00 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  7. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-10-20 06:40 UTCEG score recompute
  9. 2026-10-20 06:40 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  10. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-19 05:20 UTCEG score recompute
  12. 2026-10-19 05:20 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  13. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-18 04:00 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  15. 2026-10-18 03:39 UTCEG score recompute
  16. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-17 02:38 UTCEG score recompute
  18. 2026-10-17 02:37 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  19. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-16 01:18 UTCEG score recompute
  21. 2026-10-16 01:17 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  22. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-10-14 20:27 UTCEG score recompute
  24. 2026-10-14 20:27 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  26. 2026-10-14 10:43 UTCEG score recompute
  27. 2026-10-14 10:42 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  28. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  29. 2026-10-13 09:10 UTCEG score recompute
  30. 2026-10-13 09:10 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  31. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  32. 2026-10-12 16:05 UTCEG score recompute
  33. 2026-10-12 07:50 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  34. 2026-10-11 19:47 UTCEG score recompute
  35. 2026-10-11 17:02 UTCEG score recompute
  36. 2026-10-11 14:27 UTCEG score recompute
  37. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  38. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  39. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  40. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  41. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  42. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  43. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  44. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  45. 2026-10-03 16:49 UTCOSV refresh
  46. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  47. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  48. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  49. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  50. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  51. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  52. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  53. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  54. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  55. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  56. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  57. 2026-09-14 07:37 UTCEG score recompute
  58. 2026-09-14 07:37 UTCGHSA enrichmentGHSA-cmpj-2x3g-m7g3 · GitHub severity CRITICAL · GitHub CVSS 10.0
  59. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  60. 2026-09-13 03:09 UTCOSV refresh
  61. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  62. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  63. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  64. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  65. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  66. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  67. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  68. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  69. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  70. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  71. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  72. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  73. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  74. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  75. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 23rd percentile

Frequently asked(5)

What is CVE-2026-44327?
CVE-2026-44327 is a critical-severity vulnerability; its CVE record was published on May 27, 2026. free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF mounts the nnef-oam route group without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can hit the OAM route with no Authorization header at all and the handler…
When was the CVE record for CVE-2026-44327 published?
The CVE record for CVE-2026-44327 was published on May 27, 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 October 14, 2026; the record at its source may have been updated since.
Is CVE-2026-44327 actively exploited?
CVE-2026-44327 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (24th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-44327?
CVE-2026-44327 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-44327?
The CVE record for CVE-2026-44327 names the fix: "This vulnerability is fixed in 4.2.2." The vendor advisories EchelonGraph has for CVE-2026-44327 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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