CVE-2026-78156

HIGHPre-NVD 7.47.4
EchelonGraph scoreMEDIUM confidence

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

Score 7.4 from GitHub Security Advisory (severity: LOW) published 2026-08-24. A secondary CVSS source baseline 7.4; 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 week
7.4EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.4Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

A security vulnerability has been detected in Open5GS 2.8.0. Affected by this issue is the function hss_ogs_diam_s6a_air_cb of the file src/hss/hss-s6a-path.c of the component S6a Authentication-Information-Request Handler. Such manipulation of the argument Visited-PLMN-Id leads to heap-based buffer overflow. The attack may be performed from remote. The name of the patch is a9c82ee0b590d76a581b0580cb46b598984e2392. A patch should be applied to remediate this issue.

CVSS v3
7.4
EG Score
7.4HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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)
Severity74% × 45%
The EG Score, 7.4 of 10.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.
EPSS PROB
0.6%
EPSS %ILE
45th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines until it ships, then apply the release.

Exploitation none (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

August 23, 2026

Last Modified

August 26, 2026

Advisory Details (3)

Auto-updated Aug 23, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
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-19) · GitHub

https://github.com/open5gs/open5gs/
GitHub commit

commit a9c82ee0b590 (open5gs/open5gs)

Fix landed in open5gs/open5gs commit a9c82ee0b590 — awaiting tagged release

https://github.com/open5gs/open5gs/commit/a9c82ee0b590d76a581b0580cb46b598984e2392
Web page

[Bug]: S6a AIR Heap buffer overflow (read) in HSS KASME derivation via short Visited-PLMN-Id · Issue #4661 · open5gs/open5gs · GitHub

https://github.com/open5gs/open5gs/issues/4661

Vendor Advisories for CVE-2026-78156(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 19× in last 7d / 104× 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 195 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 95 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  2. 2026-10-13 06:51 UTCEG score recompute
  3. 2026-10-13 06:51 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  4. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  5. 2026-10-12 15:37 UTCEG score recompute
  6. 2026-10-11 19:23 UTCEG score recompute
  7. 2026-10-11 16:39 UTCEG score recompute
  8. 2026-10-11 13:57 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  11. 2026-10-10 13:20 UTCEG score recompute
  12. 2026-10-10 13:20 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  13. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  14. 2026-10-09 05:04 UTCEG score recompute
  15. 2026-10-09 05:04 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  16. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  17. 2026-10-08 04:22 UTCEG score recompute
  18. 2026-10-08 04:22 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  19. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  20. 2026-10-07 06:50 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  21. 2026-10-06 19:20 UTCEG score recompute
  22. 2026-10-06 19:20 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  23. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  24. 2026-10-06 07:47 UTCEG score recompute
  25. 2026-10-06 07:47 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
Show 75 more
  1. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  2. 2026-10-05 17:05 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  3. 2026-10-05 04:47 UTCEG score recompute
  4. 2026-10-05 04:47 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  5. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  6. 2026-10-04 15:37 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  7. 2026-10-04 04:04 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  8. 2026-10-03 16:34 UTCEG score recompute
  9. 2026-10-03 16:34 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  10. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  11. 2026-10-02 20:58 UTCEG score recompute
  12. 2026-10-02 20:58 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  13. 2026-10-02 08:39 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  14. 2026-10-01 21:10 UTCEG score recompute
  15. 2026-10-01 21:10 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  17. 2026-10-01 07:49 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  18. 2026-09-30 20:20 UTCEG score recompute
  19. 2026-09-30 20:20 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  20. 2026-09-30 07:21 UTCEG score recompute
  21. 2026-09-30 07:21 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  22. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  23. 2026-09-29 15:20 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  24. 2026-09-28 23:23 UTCEG score recompute
  25. 2026-09-28 23:23 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  26. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  27. 2026-09-28 11:24 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  28. 2026-09-27 23:54 UTCEG score recompute
  29. 2026-09-27 23:54 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  30. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  31. 2026-09-27 12:21 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  32. 2026-09-27 00:51 UTCEG score recompute
  33. 2026-09-27 00:51 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  34. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  35. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  36. 2026-09-25 06:30 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  37. 2026-09-24 18:59 UTCEG score recompute
  38. 2026-09-24 18:59 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  39. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  40. 2026-09-24 07:29 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  41. 2026-09-23 19:59 UTCEG score recompute
  42. 2026-09-23 19:59 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  43. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  44. 2026-09-23 07:09 UTCEG score recompute
  45. 2026-09-23 07:09 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  46. 2026-09-22 19:40 UTCEG score recompute
  47. 2026-09-22 19:39 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  48. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  49. 2026-09-22 06:52 UTCEG score recompute
  50. 2026-09-22 06:51 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  51. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  52. 2026-09-21 19:21 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  53. 2026-09-21 07:51 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  54. 2026-09-20 20:21 UTCEG score recompute
  55. 2026-09-20 20:21 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  56. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  57. 2026-09-20 08:51 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  58. 2026-09-19 20:35 UTCEG score recompute
  59. 2026-09-19 20:35 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  60. 2026-09-19 09:06 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  61. 2026-09-18 21:35 UTCEG score recompute
  62. 2026-09-18 21:35 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  63. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  64. 2026-09-18 08:44 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  65. 2026-09-17 21:14 UTCEG score recompute
  66. 2026-09-17 21:14 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  67. 2026-09-17 07:09 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  68. 2026-09-16 19:39 UTCEG score recompute
  69. 2026-09-16 19:39 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  70. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  71. 2026-09-16 07:17 UTCEG score recompute
  72. 2026-09-16 07:17 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  73. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  74. 2026-09-15 19:46 UTCGHSA enrichmentGHSA-r7gh-36fg-wvj8 · GitHub severity LOW · GitHub CVSS 7.4
  75. 2026-09-15 08:15 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78156?
CVE-2026-78156 is a high-severity vulnerability; its CVE record was published on August 23, 2026. A security vulnerability has been detected in Open5GS 2.8.0. Affected by this issue is the function hssogsdiams6aair_cb of the file src/hss/hss-s6a-path.c of the component S6a Authentication-Information-Request Handler. Such manipulation of the argument Visited-PLMN-Id leads to heap-based buffer…
When was the CVE record for CVE-2026-78156 published?
The CVE record for CVE-2026-78156 was published on August 23, 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 August 26, 2026; the record at its source may have been updated since.
Is CVE-2026-78156 actively exploited?
CVE-2026-78156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-78156?
CVE-2026-78156 has a CVSS base score of 7.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-78156?
An upstream fix for CVE-2026-78156 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-78156 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-78156

Explore →

Is Your Infrastructure Affected by CVE-2026-78156?

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

Book a Demo →Browse All CVEs