CVE-2026-86516

MEDIUMPre-NVD 4.74.7—
EchelonGraph scoreHIGH confidence

Score 4.7 from GitHub Security Advisory published 2026-09-08. a secondary CVSS source baseline 4.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.7Exploit: None knownExposed: 0

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

A vulnerability was detected in elenavanengelenmaslova mocknest-serverless 0.9.0. The affected element is an unknown function of the file deployment/aws/shared/github-oidc-role.yaml of the component AWS GitHub OIDC Deployment Helper Script. Performing a manipulation results in improper privilege management. It is possible to initiate the attack remotely. The patch is named 6ab3147282d867c1993f995272750db091c2290b. Applying a patch is the recommended action to fix this issue.

CVSS v3
4.7
EG Score
4.7(high)
EG Risk
21(Track)
EG Risk 21/100SSVC: 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
Severity47% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Sep 8, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

GitHub - elenavanengelenmaslova/mocknest-serverless: MockNest Serverless is a serverless mock runtime for AWS that enables realistic integration testing without relying on live external services. It runs natively on AWS Lambda and persists mock definitions in Amazon S3, with asynchronous webhooks/callbacks and AI-powered mock generation using Amazon Bedrock. · GitHub

https://github.com/elenavanengelenmaslova/mocknest-serverless/
github_pr

oidc hardening

Fix merged in elenavanengelenmaslova/mocknest-serverless PR #254 on 2026-05-29 — awaiting tagged release

https://github.com/elenavanengelenmaslova/mocknest-serverless/pull/254
github_commit

commit 6ab3147282d8 (elenavanengelenmaslova/mocknest-serverless)

Fix landed in elenavanengelenmaslova/mocknest-serverless commit 6ab3147282d8 — awaiting tagged release

https://github.com/elenavanengelenmaslova/mocknest-serverless/commit/6ab3147282d867c1993f995272750db091c2290b

Vendor Advisories for CVE-2026-86516(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 / 38× 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. 2026-09-20 14:49 UTCGHSA enrichment
  2. 2026-09-19 16:42 UTCEG score recompute
  3. 2026-09-19 16:42 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 18:35 UTCGHSA enrichment
  6. 2026-09-17 20:20 UTCEG score recompute
  7. 2026-09-17 20:20 UTCGHSA enrichment
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-16 21:18 UTCEG score recompute
  10. 2026-09-16 21:18 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 22:45 UTCEG score recompute
  14. 2026-09-15 22:44 UTCGHSA enrichment
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 00:35 UTCGHSA enrichment
  18. 2026-09-14 02:28 UTCEG score recompute
  19. 2026-09-14 02:28 UTCGHSA enrichment
  20. 2026-09-13 04:21 UTCEG score recompute
  21. 2026-09-13 04:21 UTCGHSA enrichment
  22. 2026-09-12 06:13 UTCEG score recompute
  23. 2026-09-12 06:13 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 13 more
  1. 2026-09-11 08:04 UTCGHSA enrichment
  2. 2026-09-10 09:57 UTCEG score recompute
  3. 2026-09-10 09:57 UTCGHSA enrichment
  4. 2026-09-09 11:50 UTCEG score recompute
  5. 2026-09-09 11:49 UTCGHSA enrichment
  6. 2026-09-08 22:01 UTCEPSS rescore
  7. 2026-09-08 13:42 UTCEG score recompute
  8. 2026-09-08 13:41 UTCGHSA enrichment
  9. 2026-09-08 12:46 UTCEG score recompute
  10. 2026-09-08 12:46 UTCGHSA enrichment
  11. 2026-09-08 04:19 UTCEG score recompute
  12. 2026-09-08 03:30 UTCEG score recompute
  13. 2026-09-08 03:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86516?
CVE-2026-86516 is a medium vulnerability published on September 8, 2026. A vulnerability was detected in elenavanengelenmaslova mocknest-serverless 0.9.0. The affected element is an unknown function of the file deployment/aws/shared/github-oidc-role.yaml of the component AWS GitHub OIDC Deployment Helper Script. Performing a manipulation results in improper privilege…
When was CVE-2026-86516 disclosed?
CVE-2026-86516 was first published in the National Vulnerability Database on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86516 actively exploited?
CVE-2026-86516 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 85.7% of all scored CVEs.
What is the CVSS score of CVE-2026-86516?
CVE-2026-86516 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-86516?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86516, 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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