CVE-2026-78156

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

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, ghsa, secondary
Trending — 5 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: None knownExposed: 0

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

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
7.4(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: Track

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
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

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.
generic

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
generic

[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 35× in last 7d / 35× 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.

  1. 2026-08-30 05:07 UTCEG score recompute
  2. 2026-08-30 05:07 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-29 17:36 UTCGHSA enrichment
  5. 2026-08-29 05:19 UTCEG score recompute
  6. 2026-08-29 05:18 UTCGHSA enrichment
  7. 2026-08-28 21:42 UTCEPSS rescore
  8. 2026-08-28 17:48 UTCGHSA enrichment
  9. 2026-08-28 06:04 UTCGHSA enrichment
  10. 2026-08-27 18:33 UTCEG score recompute
  11. 2026-08-27 18:32 UTCGHSA enrichment
  12. 2026-08-27 14:25 UTCEPSS rescore
  13. 2026-08-27 06:54 UTCGHSA enrichment
  14. 2026-08-26 19:23 UTCEG score recompute
  15. 2026-08-26 19:23 UTCGHSA enrichment
  16. 2026-08-26 19:22 UTCNVD updateCVSS v4 → 2.1
  17. 2026-08-26 18:41 UTCEG score recompute
  18. 2026-08-26 18:41 UTCGHSA enrichment
  19. 2026-08-26 18:41 UTCMITRE cvelistV5CVSS v4 → 5.3
  20. 2026-08-26 14:47 UTCEPSS rescore
  21. 2026-08-26 14:46 UTCGHSA enrichment
  22. 2026-08-26 03:16 UTCGHSA enrichment
  23. 2026-08-25 15:46 UTCEG score recompute
  24. 2026-08-25 15:46 UTCGHSA enrichment
  25. 2026-08-25 13:49 UTCEPSS rescore
Show 10 more
  1. 2026-08-25 04:16 UTCGHSA enrichment
  2. 2026-08-24 16:46 UTCEG score recompute
  3. 2026-08-24 16:46 UTCGHSA enrichment
  4. 2026-08-24 14:18 UTCEPSS rescore
  5. 2026-08-24 12:05 UTCGHSA enrichment
  6. 2026-08-24 00:35 UTCEG score recompute
  7. 2026-08-24 00:35 UTCGHSA enrichment
  8. 2026-08-24 00:35 UTCNVD updateCVSS v4 → 2.1
  9. 2026-08-23 23:51 UTCEG score recompute
  10. 2026-08-23 23:50 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78156?
CVE-2026-78156 is a high vulnerability 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 CVE-2026-78156 disclosed?
CVE-2026-78156 was first published in the National Vulnerability Database on August 23, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78156 actively exploited?
CVE-2026-78156 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 74.2% of all scored CVEs.
What is the CVSS score of CVE-2026-78156?
CVE-2026-78156 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-78156?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78156, 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

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