CVE-2026-42459

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-07. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 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. Prior to 4.2.2, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500 Internal Server Error response that exposes internal infrastructure details. This vulnerability is fixed in 4.2.2.

CVSS v3
7.5
EG Score
7.5(medium)
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
25%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 28, 2026

Advisory Details (1)

Auto-updated Jun 7, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Improper Input Validation and Generation of Error Message Containing Sensitive Information in github.com/free5gc/udm · Advisory · free5gc/free5gc · GitHub

https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr

Vendor Advisories for CVE-2026-42459(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/udm—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/udm———

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 36× 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 226 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-42459?
CVE-2026-42459 is a high vulnerability published on May 27, 2026. free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI…
When was CVE-2026-42459 disclosed?
CVE-2026-42459 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42459 actively exploited?
CVE-2026-42459 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 74.6% of all scored CVEs.
What is the CVSS score of CVE-2026-42459?
CVE-2026-42459 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-42459?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42459, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-42459

Explore →

Is Your Infrastructure Affected by CVE-2026-42459?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs