CVE-2026-84851

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
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: None knownExposed: 0

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

An uncontrolled recursion issue exists in Amazon Ion-C versions before 1.1.6 that might allow a remote unauthenticated actor to craft Ion data that exhausts the native call stack and crashes the application using the library, resulting in a denial of service.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 3, 2026

Advisory Details (3)

Auto-updated Sep 2, 2026
Patch available. Sources: github, github_release.
github Patch Available

Uncontrolled recursion in the Ion reader in Amazon Ion-C before 1.1.6 · Advisory · amazon-ion/ion-c · GitHub

https://github.com/amazon-ion/ion-c/security/advisories/GHSA-9gfg-hgj4-gh44
generic

CVE-2026-84851- Uncontrolled recursion in the Ion reader in Amazon Ion-C before 1.1.6

https://aws.amazon.com/security/security-bulletins/2026-094-aws/
github_release Patch Available

v1.1.6

Patch available: amazon-ion/ion-c v1.1.6

https://github.com/amazon-ion/ion-c/releases/tag/v1.1.6

Vendor Advisories for CVE-2026-84851(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 31× 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. 2026-09-18 20:08 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 20:44 UTCEG score recompute
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-16 21:21 UTCEG score recompute
  6. 2026-09-16 14:09 UTCEPSS rescore
  7. 2026-09-16 09:04 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 09:23 UTCEG score recompute
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-15 03:12 UTCEPSS rescore
  12. 2026-09-13 22:10 UTCEG score recompute
  13. 2026-09-12 22:48 UTCEG score recompute
  14. 2026-09-11 23:16 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-11 10:48 UTCEG score recompute
  18. 2026-09-10 11:25 UTCEG score recompute
  19. 2026-09-08 23:10 UTCEG score recompute
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-06 15:07 UTCEG score recompute
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-05 15:43 UTCEG score recompute
  24. 2026-09-05 15:31 UTCEPSS rescore
  25. 2026-09-04 16:21 UTCEG score recompute
Show 6 more
  1. 2026-09-04 05:07 UTCEPSS rescore
  2. 2026-09-03 14:30 UTCEG score recompute
  3. 2026-09-03 13:25 UTCEG score recompute
  4. 2026-09-03 05:29 UTCEG score recompute
  5. 2026-09-02 20:31 UTCEG score recompute
  6. 2026-09-02 20:30 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-84851?
CVE-2026-84851 is a high vulnerability published on September 2, 2026. An uncontrolled recursion issue exists in Amazon Ion-C versions before 1.1.6 that might allow a remote unauthenticated actor to craft Ion data that exhausts the native call stack and crashes the application using the library, resulting in a denial of service.
When was CVE-2026-84851 disclosed?
CVE-2026-84851 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84851 actively exploited?
CVE-2026-84851 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 72.6% of all scored CVEs.
What is the CVSS score of CVE-2026-84851?
CVE-2026-84851 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-84851?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84851, 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

Explore the affected products and dependency analysis for CVE-2026-84851

Explore →

Is Your Infrastructure Affected by CVE-2026-84851?

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

Start Free Scan →Browse All CVEs