{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-35030", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-31T21:06:06.427Z", "datePublished": "2026-04-06T16:47:02.065Z", "dateUpdated": "2026-04-06T16:47:02.065Z"}, "containers": {"cna": {"title": "LiteLLM has an authentication bypass via OIDC userinfo cache key collision", "problemTypes": [{"descriptions": [{"cweId": "CWE-287", "lang": "en", "description": "CWE-287: Improper Authentication", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "baseScore": 9.4, "baseSeverity": "CRITICAL", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/BerriAI/litellm/security/advisories/GHSA-jjhc-v7c2-5hh6", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/BerriAI/litellm/security/advisories/GHSA-jjhc-v7c2-5hh6"}], "affected": [{"vendor": "BerriAI", "product": "litellm", "versions": [{"version": "< 1.83.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-06T16:47:02.065Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-jjhc-v7c2-5hh6", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-35030", "lastModified": "2026-04-06T17:17:12.650", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.4, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-04-06T17:17:12.650", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/BerriAI/litellm/security/advisories/GHSA-jjhc-v7c2-5hh6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"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": "2026-04-06T21:22:20.689262+00:00", "value": {"mitigation_remediation": ["Upgrade LiteLLM to version 1.83.0 or later.", "Disable the enable_jwt_auth option on any instances that do not require JWT/OIDC authentication.", "Revoke any previously issued JWT tokens that may have been compromised and generate new tokens for legitimate users."], "summary": {"action": "Patch Now", "impact": "Unauthorized Access/Impersonation"}, "threat_synthesis": {"affected_systems": "The vulnerability impacts LiteLLM deployments by BerriAI running any version before 1.83.0 where JWT or OIDC authentication is enabled. The configuration option that triggers the issue, enable_jwt_auth, is not enabled by default, so many installations are not affected, but any instance that has JWT authentication turned on prior to the 1.83.0 release is vulnerable.", "description_and_impact": "LiteLLM, an AI gateway that proxies LLM API calls, contains a critical authentication bypass. The flaw arises because the OIDC userinfo cache uses the first 20 characters of a JWT token as its key. JWT headers produced by the same signing algorithm share identical initial 20 characters, allowing an attacker to craft a token that collides with a legitimate cached token. When the cache is accessed, the service treats the attacker as the legitimate user, granting them unauthorized access and all associated permissions. This is a classic authentication bypass vulnerability.", "risk_and_exploitability": "With a CVSS score of 9.4, the flaw is classified as critical. EPSS data is unavailable and the vulnerability is not listed in CISA\u2019s KEV catalog, yet the attack requires only the ability to craft a JWT with a matching 20\u2011character prefix\u2014 a trivial task for any unauthenticated attacker. Successful exploitation results in user impersonation, enabling access to sensitive data or abuse of the AI gateway\u2019s capabilities, and the likelihood of exploitation is high because no additional conditions are needed."}}}}, "created": "2026-04-06T21:30:01.738990+00:00", "updated": "2026-04-06T21:31:33.170590+00:00", "vendors": ["berriai", "berriai$PRODUCT$litellm"]}