CVE-2026-4965

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

A vulnerability was detected in letta-ai letta 0.16.4. This issue affects the function resolve_type of the file letta/functions/ast_parsers.py of the component Incomplete Fix CVE-2025-6101. Performing a manipulation results in improper neutralization of directives in dynamically evaluated code. The attack can be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

March 27, 2026

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Aug 31, 2026
No patch confirmed yet.
generic

RCE via eval() Injection in Type Annotation Coercion (Incomplete Fix for CVE-2025-6101) · GitHub

https://gist.github.com/YLChen-007/fc09bc447a73bba526c1642d9ce73ca5

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 70× 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.

Showing the most recent 100 of 179 total refreshes for this CVE.

  1. 2026-09-01 13:54 UTCEPSS rescore
  2. 2026-09-01 04:40 UTCEPSS rescore
  3. 2026-08-30 19:17 UTCEPSS rescore
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:41 UTCEPSS rescore
  6. 2026-08-27 14:25 UTCEPSS rescore
  7. 2026-08-26 14:46 UTCEPSS rescore
  8. 2026-08-25 13:49 UTCEPSS rescore
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-21 23:49 UTCEPSS rescore
  11. 2026-08-20 22:55 UTCEPSS rescore
  12. 2026-08-19 17:04 UTCEPSS rescore
  13. 2026-08-18 13:48 UTCEPSS rescore
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 09:58 UTCEG score recompute
  17. 2026-08-16 09:58 UTCGHSA enrichment
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 23:46 UTCGHSA enrichment
  21. 2026-08-14 19:25 UTCGHSA enrichment
  22. 2026-08-14 15:02 UTCGHSA enrichment
  23. 2026-08-14 10:39 UTCGHSA enrichment
  24. 2026-08-14 06:17 UTCEG score recompute
  25. 2026-08-14 06:17 UTCGHSA enrichment
Show 75 more
  1. 2026-08-13 22:00 UTCEPSS rescore
  2. 2026-08-13 00:57 UTCGHSA enrichment
  3. 2026-08-12 20:36 UTCEG score recompute
  4. 2026-08-12 20:36 UTCGHSA enrichment
  5. 2026-08-12 13:51 UTCEPSS rescore
  6. 2026-08-12 01:09 UTCGHSA enrichment
  7. 2026-08-11 20:44 UTCEG score recompute
  8. 2026-08-11 20:44 UTCGHSA enrichment
  9. 2026-08-11 08:16 UTCGHSA enrichment
  10. 2026-08-11 03:47 UTCEG score recompute
  11. 2026-08-11 03:46 UTCGHSA enrichment
  12. 2026-08-11 00:00 UTCEPSS rescore
  13. 2026-08-10 12:00 UTCGHSA enrichment
  14. 2026-08-10 06:32 UTCGHSA enrichment
  15. 2026-08-10 02:10 UTCGHSA enrichment
  16. 2026-08-09 21:47 UTCGHSA enrichment
  17. 2026-08-09 17:26 UTCEG score recompute
  18. 2026-08-09 17:26 UTCGHSA enrichment
  19. 2026-08-09 13:46 UTCEPSS rescore
  20. 2026-08-09 13:04 UTCGHSA enrichment
  21. 2026-08-09 05:50 UTCEG score recompute
  22. 2026-08-09 05:50 UTCGHSA enrichment
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-08 09:43 UTCGHSA enrichment
  25. 2026-08-08 05:21 UTCGHSA enrichment
  26. 2026-08-08 01:00 UTCGHSA enrichment
  27. 2026-08-07 20:38 UTCEG score recompute
  28. 2026-08-07 20:38 UTCGHSA enrichment
  29. 2026-08-07 16:17 UTCGHSA enrichment
  30. 2026-08-06 18:40 UTCEG score recompute
  31. 2026-08-06 18:40 UTCGHSA enrichment
  32. 2026-08-06 13:47 UTCEPSS rescore
  33. 2026-08-06 09:29 UTCGHSA enrichment
  34. 2026-08-06 05:08 UTCGHSA enrichment
  35. 2026-08-06 00:46 UTCEG score recompute
  36. 2026-08-06 00:46 UTCGHSA enrichment
  37. 2026-08-05 19:17 UTCEPSS rescore
  38. 2026-08-04 15:10 UTCEPSS rescore
  39. 2026-08-04 10:39 UTCEPSS rescore
  40. 2026-08-04 03:56 UTCGHSA enrichment
  41. 2026-08-03 23:07 UTCEG score recompute
  42. 2026-08-03 23:07 UTCGHSA enrichment
  43. 2026-08-03 10:36 UTCEPSS rescore
  44. 2026-08-02 23:54 UTCGHSA enrichment
  45. 2026-08-02 19:32 UTCGHSA enrichment
  46. 2026-08-02 15:11 UTCEG score recompute▲ 2.50
  47. 2026-08-02 15:11 UTCGHSA enrichment
  48. 2026-08-02 02:27 UTCEPSS rescore
  49. 2026-08-01 04:16 UTCEPSS rescore
  50. 2026-07-30 16:28 UTCEPSS rescore
  51. 2026-07-30 01:30 UTCEPSS rescore
  52. 2026-07-28 15:37 UTCEPSS rescore
  53. 2026-07-26 14:54 UTCEPSS rescore
  54. 2026-07-25 14:18 UTCEPSS rescore
  55. 2026-07-24 14:18 UTCEPSS rescore
  56. 2026-07-23 14:18 UTCEPSS rescore
  57. 2026-07-23 03:18 UTCEG score recompute
  58. 2026-07-22 14:08 UTCEPSS rescore
  59. 2026-07-21 15:25 UTCEPSS rescore
  60. 2026-07-20 17:08 UTCEPSS rescore
  61. 2026-07-19 14:31 UTCEPSS rescore
  62. 2026-07-19 14:31 UTCEPSS rescore
  63. 2026-07-19 02:29 UTCEPSS rescore
  64. 2026-07-18 10:04 UTCEPSS rescore
  65. 2026-07-17 05:24 UTCOSV refresh
  66. 2026-07-16 17:03 UTCEPSS rescore
  67. 2026-07-15 16:57 UTCEPSS rescore
  68. 2026-07-15 16:57 UTCEPSS rescore
  69. 2026-07-15 02:00 UTCEPSS rescore
  70. 2026-07-15 02:00 UTCEPSS rescore
  71. 2026-07-13 22:31 UTCEPSS rescore
  72. 2026-07-13 06:13 UTCEPSS rescore
  73. 2026-07-13 06:13 UTCEPSS rescore
  74. 2026-07-12 05:46 UTCEPSS rescore
  75. 2026-07-11 08:27 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-4965?
CVE-2026-4965 is a critical vulnerability published on March 27, 2026. A vulnerability was detected in letta-ai letta 0.16.4. This issue affects the function resolvetype of the file letta/functions/astparsers.py of the component Incomplete Fix CVE-2025-6101. Performing a manipulation results in improper neutralization of directives in dynamically evaluated code. The…
When was CVE-2026-4965 disclosed?
CVE-2026-4965 was first published in the National Vulnerability Database on March 27, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4965 actively exploited?
CVE-2026-4965 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.5% of all scored CVEs.
What is the CVSS score of CVE-2026-4965?
CVE-2026-4965 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-4965?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4965, 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.

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