CVE-2026-35030

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{"bugzilla": {"description": "litellm: LiteLLM: Authentication bypass and privilege escalation via OIDC userinfo cache key collision", "id": "2455509", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455509"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-222", "details": ["LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.0, when JWT authentication is enabled (enable_jwt_auth: true), the OIDC userinfo cache uses token[:20] as the cache key. JWT headers produced by the same signing algorithm generate identical first 20 characters. This configuration option is not enabled by default. Most instances are not affected. An unauthenticated attacker can craft a token whose first 20 characters match a legitimate user's cached token. On cache hit, the attacker inherits the legitimate user's identity and permissions. This affects deployments with JWT/OIDC authentication enabled. Fixed in v1.83.0.", "A flaw was found in LiteLLM, a proxy server for Large Language Model (LLM) APIs. When JSON Web Token (JWT) authentication is enabled, the OIDC user information cache uses a truncated portion of the token as a cache key. An unauthenticated attacker can exploit this by crafting a JWT with the same initial characters as a legitimate user's cached token. This allows the attacker to bypass authentication and inherit the legitimate user's identity and permissions, potentially leading to unauthorized access and privilege escalation."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, ensure that JWT authentication is not enabled in LiteLLM configurations. The vulnerability only manifests when `enable_jwt_auth` is set to `true`. If JWT authentication is not strictly required, disable it to prevent potential authentication bypass and privilege escalation. If this configuration is changed, a restart of the LiteLLM service may be required for the changes to take effect."}, "name": "CVE-2026-35030", "package_state": [{"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Affected", "package_name": "redhat-user-workloads/lightspeed-stack", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "redhat-user-workloads/lightspeed-chatbot-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "redhat-user-workloads/llama-stack-cpu", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-llama-stack-core-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "package_name": "rhoai/odh-mlflow-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-04-06T16:47:02Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-35030\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-35030\nhttps://github.com/BerriAI/litellm/security/advisories/GHSA-jjhc-v7c2-5hh6"], "statement": "This is an Important flaw in LiteLLM that enables authentication bypass and privilege escalation. The vulnerability is present only when JWT authentication is explicitly enabled, as this configuration is not active by default. Red Hat Ansible Automation Platform, Lightspeed Core, Red Hat OpenShift AI, and Ansible Services are affected if configured with JWT authentication.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.83.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "litellm", "source": "cna", "vendor": "BerriAI"}, "product": "litellm", "vendor": "berriai"}], "analysis": {"en": {"generated_at": "2026-04-08T01:55:39.823714+00:00", "value": {"mitigation_remediation": ["Upgrade LiteLLM to version 1.83.0 or later, which resolves the cache key collision issue.", "Disable JWT/OIDC authentication (set enable_jwt_auth to false) if it is not required for your deployment.", "Limit network exposure of the LiteLLM endpoint to trusted users or internal networks only."], "summary": {"action": "Patch Immediately", "impact": "Authentication Bypass"}, "threat_synthesis": {"affected_systems": "Affected deployments include BerriAI's LiteLLM environments running versions prior to 1.83.0 with JWT/OIDC authentication enabled. Systems that have not enabled enable_jwt_auth or are already running 1.83.0 or later are not impacted.", "description_and_impact": "LiteLLM, an AI gateway, uses JWT authentication when enable_jwt_auth is set to true. Prior to version 1.83.0, the OIDC userinfo cache key is derived from the first 20 characters of the token. Because JWT headers generated by the same signing algorithm produce identical prefixes, an attacker can create a token whose prefix matches a legitimate cached token. When the cache is consulted, the attacker receives the legitimate user's identity and permissions, effectively bypassing authentication. This flaw allows an unauthenticated user to act as any authenticated user, gaining unauthorized access to protected resources.", "risk_and_exploitability": "The vulnerability carries a CVSS score of 9.4, indicating critical severity. Its EPSS score is less than 1%, suggesting a low probability of exploitation in the wild, and it is not listed in the CISA KEV catalog. Nevertheless, the attack scenario is straightforward: an attacker must supply a crafted JWT token that matches the cache key of an existing authenticated user. If the system is operating with JWT enabled, the attacker can trigger a cache hit and inherit that user's permissions with minimal effort, making the risk high for any exposed instance."}}}}, "created": "2026-04-06T21:30:01.738990+00:00", "updated": "2026-04-08T19:50:39.403941+00:00", "vendors": ["berriai", "berriai$PRODUCT$litellm"]}