Which versions of Python are affected by CVE-2026-35029?

BerriAI LiteLLM versions prior to v1.83.0 contain a remote code execution vulnerability in the /config/update endpoint that allows attackers to execute arbitrary code, modify system configurations,…. A patch is available.

Is there a public PoC exploit available for CVE-2026-35029?

Yes, a public proof-of-concept exploit is available for CVE-2026-35029. Prioritise patching immediately. EPSS: 0.3%.

How to fix or mitigate CVE-2026-35029?

Within 24 hours: Inventory all BerriAI LiteLLM instances and document versions in use; immediately disable or restrict network access to the /config/update endpoint. Within 7 days: Upgrade to LiteLLM v1.83.0 or later once patch validation is confirmed in your environment; apply network segmentation to limit endpoint exposure. Within 30 days: Conduct audit of proxy configurations, file access logs, and privileged account activity for the period of vulnerability exposure; implement API authentication and authorization controls per vendor hardening guidance.

Python CVE-2026-35029

Q: What is the CVSS score of CVE-2026-35029?

CVE-2026-35029 has a CVSS 4.0 base score of 8.7 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:X/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: 0.3%.

HIGH

Incorrect Authorization (CWE-863)

2026-04-03 https://github.com/BerriAI/litellm

GHSA-53mr-6c8q-9789

RCE Authentication Bypass Python

8.7

CVSS 4.0 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.7 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:X/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

Red Hat

8.8 HIGH

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:X/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

Low

User Interaction

None

Scope

Lifecycle Timeline

Re-analysis Queued

Apr 29, 2026 - 20:22 vuln.today

cvss_changed

Patch released

Apr 04, 2026 - 02:30 nvd

Patch available

Analysis Generated

Apr 03, 2026 - 22:15 vuln.today

CVE Published

Apr 03, 2026 - 21:59 nvd

HIGH 8.7

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

108 pypi packages depend on litellm (86 direct, 23 indirect)

Ecosystem-wide dependent count for version 1.83.0.

DescriptionGitHub Advisory

Impact

The /config/update endpoint does not enforce admin role authorization. A user who is already authenticated into the platform can then use this endpoint to do the following:

Modify proxy configuration and environment variables
Register custom pass-through endpoint handlers pointing to attacker-controlled Python code, achieving remote code execution
Read arbitrary server files by setting UI_LOGO_PATH and fetching via /get_image
Take over other priveleged accounts by overwriting UI_USERNAME and UI_PASSWORD environment variables

Patches

Fixed in v1.83.0. The endpoint now requires proxy_admin role.

Workarounds

Restrict API key distribution. There is no configuration-level workaround.

AnalysisAI

Remote code execution in BerriAI LiteLLM (pkg:pip/litellm) prior to v1.83.0 allows authenticated users without admin privileges to execute arbitrary Python code, modify proxy configuration, read server files, and hijack privileged accounts via an improperly protected /config/update endpoint. Authentication requirements not confirmed from available data. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate to platform as regular user

Exploit

Access /config/update endpoint

Execution

Impact

Execute arbitrary remote code on server

Access

Authenticate to platform as regular user

Exploit

Access /config/update endpoint

Execution

Impact

Execute arbitrary remote code on server

Vulnerability AssessmentAI

Exploitation	Authenticated user access required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	Real-world risk is HIGH for organizations running vulnerable LiteLLM instances with multiple user accounts. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker with a valid low-privilege API key or user credential authenticates to a LiteLLM proxy instance. They send a POST request to /config/update with a malicious payload that registers a custom pass-through endpoint handler pointing to attacker-controlled Python code hosted on an external server or embedded inline. …
Remediation	Vendor-released patch: Upgrade to LiteLLM version 1.83.0 or later via pip (pip install --upgrade litellm>=1.83.0). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Inventory all BerriAI LiteLLM instances and document versions in use; immediately disable or restrict network access to the /config/update endpoint. …

Threat intelligence, references, and detailed analysis are available after sign-in.