# CVE-2026-4965: letta-ai letta Incomplete Fix CVE-2025-6101 ast_parsers.py resolve_type eval injection

> Remote attackers can execute arbitrary code via improper neutralization in the resolve_type function of the letta library.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Mar 2026
- **Updated:** 27 Mar 2026
- **Also known as:** GHSA-wmhq-7qrq-wwwj

## What is CVE-2026-4965?

CVE-2026-4965 is a medium-severity code injection vulnerability in letta-ai letta, published on 27 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-95 (Improper Neutralization of Directives in Dynamically Evaluated Code), CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-4965?

It affects 1 product.


Products: Letta Letta.

## How do I fix CVE-2026-4965?

No fix has been published for CVE-2026-4965 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4965 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4965 exists.

## Other vulnerabilities in letta-ai letta

- [CVE-2025-51482](https://insights.sbomify.com/CVE-2025-51482/): Code injection in n/a (high 8.8)
- [CVE-2026-4964](https://insights.sbomify.com/CVE-2026-4964/): letta-ai letta File URL message_helper.py _convert_message_create_to_message server-side request forgery (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4965 and fix it if it is affected.

What it is: CVE-2026-4965 is a medium-severity code injection vulnerability in letta-ai letta, published on 27 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4965 exists.

Affected product: letta-ai letta. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-4965/ (Markdown: https://insights.sbomify.com/CVE-2026-4965/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4965
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4965
- OSV: https://osv.dev/vulnerability/CVE-2026-4965

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4965/
Summaries are generated and may contain mistakes; the official description above is the record.