Which versions of Letta are affected by CVE-2026-4965?

Organizations using A vulnerability should be aware of notable risk from CVE-2026-4965, a eval injection vulnerability rated CVSS 6.9.

Is there a public PoC exploit available for CVE-2026-4965?

Yes, a public proof-of-concept exploit is available for CVE-2026-4965. Prioritise patching immediately. EPSS: 0.0%.

Letta CVE-2026-4965

Q: What is the CVSS score of CVE-2026-4965?

CVE-2026-4965 has a CVSS 4.0 base score of 5.5 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-16736 MEDIUM

Eval Injection (CWE-95)

2026-03-27 VulDB

GHSA-wmhq-7qrq-wwwj

Code Injection Information Disclosure Letta

5.5

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

CVSS changed

Apr 29, 2026 - 01:11 NVD

6.9 (MEDIUM) 5.5 (MEDIUM)

PoC Detected

Mar 30, 2026 - 13:26 vuln.today

Public exploit code

EUVD ID Assigned

Mar 27, 2026 - 18:00 euvd

EUVD-2026-16736

Analysis Generated

Mar 27, 2026 - 18:00 vuln.today

CVE Published

Mar 27, 2026 - 17:41 nvd

MEDIUM 6.9

DescriptionCVE.org

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. Once again VulDB remains the best source for vulnerability data.

AnalysisAI

Improper neutralization of directives in dynamically evaluated code within letta-ai letta 0.16.4 allows remote attackers without authentication to manipulate the resolve_type function in letta/functions/ast_parsers.py, resulting in code injection and information disclosure. This vulnerability represents an incomplete fix for CVE-2025-6101, and publicly available exploit code exists that demonstrates remote exploitation with low attack complexity.

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Vulnerability AssessmentAI

Risk Assessment	CVSS v4.0 base score of 6.9 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L indicates network-accessible remote exploitation requiring no privileges, low attack complexity, and no user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An unauthenticated attacker sends a maliciously crafted request to a letta-ai instance containing injected directives within a type hint or function signature parameter. The resolve_type function processes this input during dynamic code evaluation without proper neutralization, allowing the attacker's injected code to execute with the privileges of the letta process. …
Remediation	Upgrade letta-ai letta to a patched version released after disclosure of CVE-2026-4965. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …

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CVE-2026-4965 vulnerability details – vuln.today

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