CVE-2026-8743

MEDIUMNVD 6.36.3
EchelonGraph scoreMEDIUM confidence

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

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-05-17. NVD baseline CVSS 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Elevated
6.3EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (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: 6.3Exploit: No code on recordExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

A vulnerability was found in Open5GS up to 2.7.6. This impacts the function ran_ue_find_by_amf_ue_ngap_id of the file src/amf/context.c of the component AMF/MME. Performing a manipulation results in improper authorization. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The patch is named 5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1. It is suggested to install a patch to address this issue.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100

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)
Severity63% × 45%
The EG Score, 6.3 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (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: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

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

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (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 17, 2026

Last Modified

May 19, 2026

Advisory Details (4)

Auto-updated May 18, 2026
Fix referenced — no release confirmed yet.
Web page

amf,mme: validate RAN ownership for UE-associated messages by acetcom · Pull Request #4553 · open5gs/open5gs · GitHub

https://github.com/open5gs/open5gs/pull/4553
Web page

[Bug]: UE Downlink Redirection via Forged PDUSessionResourceSetupResponse · Issue #4498 · open5gs/open5gs · GitHub

https://github.com/open5gs/open5gs/issues/4498
Web page

amf,mme: validate RAN ownership for UE-associated messages · open5gs/open5gs@5746b85 · GitHub

https://github.com/open5gs/open5gs/commit/5746b8576cfceec18ed87eb7d8cf11b1fb4cd8b1
Web page

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-2026-8743(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 28× 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 97 of 201 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. 3 repeat rows among the latest 100 are merged into the row they repeat. The 104 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 14:50 UTCEG score recompute
  2. 2026-10-11 19:16 UTCEG score recompute
  3. 2026-10-11 16:33 UTCEG score recompute
  4. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  5. 2026-10-11 13:49 UTCEG score recompute
  6. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  7. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  8. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  9. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  10. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  11. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  12. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  13. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  14. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  15. 2026-09-30 03:40 UTCOSV refresh
  16. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  17. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  19. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  20. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  21. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  22. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  24. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  25. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.2% · 13th percentile
Show 72 more
  1. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  2. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  3. 2026-09-13 16:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  4. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  5. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  6. 2026-09-11 09:38 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  7. 2026-09-11 06:23 UTCOSV refresh
  8. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  9. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  10. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  11. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  12. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  13. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  14. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  15. 2026-08-30 19:18 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  16. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  17. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  18. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  19. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  20. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  21. 2026-08-24 14:18 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  22. 2026-08-23 17:20 UTCEG score recompute
  23. 2026-08-23 17:20 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  24. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  25. 2026-08-22 00:47 UTCEG score recompute
  26. 2026-08-22 00:47 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  27. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  28. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  29. 2026-08-20 19:14 UTCEG score recompute
  30. 2026-08-20 19:14 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  31. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  32. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  33. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  34. 2026-08-17 10:10 UTCEG score recompute
  35. 2026-08-17 10:10 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  36. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  37. 2026-08-16 03:42 UTCEG score recompute
  38. 2026-08-16 03:42 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  39. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  40. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  41. 2026-08-14 02:15 UTCEG score recompute
  42. 2026-08-14 02:15 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  43. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  44. 2026-08-12 14:43 UTCEG score recompute
  45. 2026-08-12 14:43 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  46. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  47. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  48. 2026-08-11 10:53 UTCEG score recompute
  49. 2026-08-11 10:53 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  50. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  51. 2026-08-10 08:29 UTCEG score recompute
  52. 2026-08-10 08:28 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  53. 2026-08-09 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  54. 2026-08-09 06:04 UTCEG score recompute
  55. 2026-08-09 06:04 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  56. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  57. 2026-08-08 03:39 UTCEG score recompute
  58. 2026-08-08 03:39 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  59. 2026-08-07 16:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  60. 2026-08-07 01:15 UTCEG score recompute
  61. 2026-08-07 01:15 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  62. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  63. 2026-08-05 21:27 UTCEG score recompute
  64. 2026-08-05 21:27 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  65. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  66. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  67. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  68. 2026-08-03 23:35 UTCEG score recompute
  69. 2026-08-03 23:35 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3
  70. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  71. 2026-08-02 21:07 UTCEG score recompute
  72. 2026-08-02 21:07 UTCGHSA enrichmentGHSA-9vhj-8h2m-3g3m · GitHub severity LOW · GitHub CVSS 6.3

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8743?
CVE-2026-8743 is a medium-severity vulnerability; its CVE record was published on May 17, 2026. A vulnerability was found in Open5GS up to 2.7.6. This impacts the function ranuefindbyamfuengap_id of the file src/amf/context.c of the component AMF/MME. Performing a manipulation results in improper authorization. It is possible to initiate the attack remotely. The exploit has been made public…
When was the CVE record for CVE-2026-8743 published?
The CVE record for CVE-2026-8743 was published on May 17, 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 May 19, 2026; the record at its source may have been updated since.
Is CVE-2026-8743 actively exploited?
CVE-2026-8743 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-8743?
CVE-2026-8743 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-8743?
A fix for CVE-2026-8743 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-8743 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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