CVE-2026-59820
Description
A flaw was found in LiteLLM, a proxy server for Large Language Model (LLM) APIs. An authenticated user, with specific API route access, could upload a specially crafted skill archive. This archive, containing path traversal entries, would allow files to be written outside of the designated extraction directory. This vulnerability could lead to arbitrary file creation or modification, potentially resulting in system compromise.
Statement
LiteLLM prior to 1.83.7-stable does not sufficiently validate file paths extracted from uploaded Skills ZIP archives, allowing path traversal writes outside the intended extraction directory. Exploitation requires the LiteLLM Proxy Server's Skills API (/v1/skills, anthropic_routes, or llm_api_routes) to be enabled and reachable by an authenticated caller. Fixed in 1.83.7-stable.
Mitigation
Upgrade to LiteLLM 1.83.7-stable or later. Products that use LiteLLM only as a Python SDK (litellm.completion()) rather than running the LiteLLM Proxy Server with the Skills feature enabled are not exposed to this vulnerability, as the vulnerable HTTP upload endpoint does not exist in SDK-only usage.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.1 | 6.5 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | High | High | N/A |
| Availability Impact | High | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Understanding the Weakness (CWE)
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
The attacker may be able to create or overwrite critical files that are used to execute code, such as programs or libraries.
Integrity
Technical Impact: Modify Files or Directories
The attacker may be able to overwrite or create critical files, such as programs, libraries, or important data. If the targeted file is used for a security mechanism, then the attacker may be able to bypass that mechanism. For example, appending a new account at the end of a password file may allow an attacker to bypass authentication.
Confidentiality
Technical Impact: Read Files or Directories
The attacker may be able read the contents of unexpected files and expose sensitive data. If the targeted file is used for a security mechanism, then the attacker may be able to bypass that mechanism. For example, by reading a password file, the attacker could conduct brute force password guessing attacks in order to break into an account on the system.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
The attacker may be able to overwrite, delete, or corrupt unexpected critical files such as programs, libraries, or important data. This may prevent the product from working at all and in the case of protection mechanisms such as authentication, it has the potential to lock out product users.
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