CVE-2026-77235

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 99% 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
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: None knownExposed: 0

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

Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation. To remediate this issue, users should upgrade to version 11.3.1 or later.

CVSS v3
7.3
EG Score
7.3(medium)
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
Severity73% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 27, 2026

Advisory Details (2)

Auto-updated Aug 21, 2026
Patch available. Sources: github_release.
generic

Issue with FreeRTOS-Kernel - CVE-2026-77234, CVE-2026-77235, CVE-2026-77236, CVE-2026-77237

https://aws.amazon.com/security/security-bulletins/2026-086-aws/
github_release Patch Available

V11.3.1

Patch available: FreeRTOS/FreeRTOS-Kernel V11.3.1

https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1

Vendor Advisories for CVE-2026-77235(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 9× in last 7d / 43× 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 01:56 UTCEG score recompute
  2. 2026-09-16 16:05 UTCEG score recompute
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
  5. 2026-09-15 06:20 UTCEG score recompute
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-13 20:24 UTCEG score recompute
  8. 2026-09-12 21:55 UTCEG score recompute
  9. 2026-09-12 15:02 UTCEPSS rescore
  10. 2026-09-11 23:26 UTCEG score recompute
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-11 12:06 UTCEG score recompute
  13. 2026-09-10 12:12 UTCEG score recompute
  14. 2026-09-10 09:35 UTCEPSS rescore
  15. 2026-09-09 01:46 UTCEG score recompute
  16. 2026-09-08 22:01 UTCEPSS rescore
  17. 2026-09-06 18:03 UTCEG score recompute
  18. 2026-09-06 13:48 UTCEPSS rescore
  19. 2026-09-05 19:33 UTCEG score recompute
  20. 2026-09-04 21:04 UTCEG score recompute
  21. 2026-09-01 13:56 UTCEG score recompute
  22. 2026-09-01 13:54 UTCEPSS rescore
  23. 2026-09-01 04:40 UTCEPSS rescore
  24. 2026-09-01 04:40 UTCEPSS rescore
  25. 2026-08-31 03:45 UTCEG score recompute
Show 18 more
  1. 2026-08-30 19:18 UTCEPSS rescore
  2. 2026-08-30 19:17 UTCEPSS rescore
  3. 2026-08-29 06:43 UTCEG score recompute
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-28 07:42 UTCEG score recompute
  6. 2026-08-27 20:20 UTCEG score recompute
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-26 15:28 UTCEG score recompute
  9. 2026-08-26 14:47 UTCEPSS rescore
  10. 2026-08-24 15:50 UTCEG score recompute
  11. 2026-08-24 14:18 UTCEPSS rescore
  12. 2026-08-23 06:06 UTCEG score recompute
  13. 2026-08-23 00:19 UTCEPSS rescore
  14. 2026-08-21 20:23 UTCEG score recompute
  15. 2026-08-21 19:55 UTCEG score recompute
  16. 2026-08-21 18:18 UTCEG score recompute
  17. 2026-08-21 17:54 UTCEG score recompute
  18. 2026-08-21 17:54 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-77235?
CVE-2026-77235 is a high vulnerability published on August 21, 2026. Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation. To remediate this issue, users should upgrade to version…
When was CVE-2026-77235 disclosed?
CVE-2026-77235 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77235 actively exploited?
CVE-2026-77235 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 98.5% of all scored CVEs.
What is the CVSS score of CVE-2026-77235?
CVE-2026-77235 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-77235?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77235, 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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