Vulnerability-Lookup

CVE-2026-35030 (GCVE-0-2026-35030)

Vulnerability from cvelistv5 – Published: 2026-04-06 16:47 – Updated: 2026-04-07 14:24

Title

LiteLLM has an authentication bypass via OIDC userinfo cache key collision

Summary

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.

Severity ?

9.4 (Critical)


                        
                          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

CWE

CWE-287 - Improper Authentication

Assigner

GitHub_M

References

URL

Tags

https://github.com/BerriAI/litellm/security/advis…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	BerriAI	litellm	Affected: < 1.83.0

Show details on NVD website

JSON

To clipboard

{
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        "metrics": [
          {
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              "attackVector": "NETWORK",
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              "baseScore": 9.1,
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              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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            }
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                  },
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      }
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        }
      ],
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            "baseScore": 9.4,
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            "privilegesRequired": "NONE",
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            "vulnIntegrityImpact": "HIGH"
          }
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          "descriptions": [
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        }
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      "source": {
        "advisory": "GHSA-jjhc-v7c2-5hh6",
        "discovery": "UNKNOWN"
      },
      "title": "LiteLLM has an authentication bypass via OIDC userinfo cache key collision"
    }
  },
  "cveMetadata": {
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    "dateReserved": "2026-03-31T21:06:06.427Z",
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    "state": "PUBLISHED"
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FKIE_CVE-2026-35030

Vulnerability from fkie_nvd - Published: 2026-04-06 17:17 - Updated: 2026-04-07 20:20

Severity ?

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/BerriAI/litellm/security/advisories/GHSA-jjhc-v7c2-5hh6	Vendor Advisory, Mitigation

Impacted products

	Vendor	Product	Version
	litellm	litellm	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4D8630D4-67A0-4EFF-83CD-0E8FA5D3D69B",
              "versionEndExcluding": "1.83.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "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\u0027s cached token. On cache hit, the attacker inherits the legitimate user\u0027s identity and permissions. This affects deployments with JWT/OIDC authentication enabled. Fixed in v1.83.0."
    }
  ],
  "id": "CVE-2026-35030",
  "lastModified": "2026-04-07T20:20:56.653",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.1,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.2,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
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          "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",
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          "vulnIntegrityImpact": "HIGH",
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      "tags": [
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        "Mitigation"
      ],
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    }
  ],
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
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        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
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      "type": "Secondary"
    }
  ]
}

GHSA-JJHC-V7C2-5HH6

Vulnerability from github – Published: 2026-04-03 21:59 – Updated: 2026-04-06 23:40

Summary

LiteLLM: Authentication bypass via OIDC userinfo cache key collision

Details

Impact

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.

Patches

Fixed in v1.83.0. The cache key now uses the full hash of the JWT token.

Workarounds

Disable OIDC userinfo caching by setting the cache TTL to 0, or disable JWT authentication entirely.

Severity ?

9.4 (Critical)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "litellm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.83.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35030"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-03T21:59:50Z",
    "nvd_published_at": "2026-04-06T17:17:12Z",
    "severity": "CRITICAL"
  },
  "details": "###  Impact\n\nWhen 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.\n\nThis configuration option is not enabled by default. **Most instances are not affected.**\n\nAn unauthenticated attacker can craft a token whose first 20 characters match a legitimate user\u0027s cached token. On cache hit, the attacker inherits the legitimate user\u0027s identity and permissions. This affects deployments with JWT/OIDC authentication enabled.\n\n###  Patches\n\nFixed in v1.83.0. The cache key now uses the full hash of the JWT token.\n\n###  Workarounds\n\nDisable OIDC userinfo caching by setting the cache TTL to 0, or disable JWT authentication entirely.",
  "id": "GHSA-jjhc-v7c2-5hh6",
  "modified": "2026-04-06T23:40:39Z",
  "published": "2026-04-03T21:59:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/BerriAI/litellm/security/advisories/GHSA-jjhc-v7c2-5hh6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35030"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/BerriAI/litellm"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "LiteLLM: Authentication bypass via OIDC userinfo cache key collision"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-35030 (GCVE-0-2026-35030)

FKIE_CVE-2026-35030

GHSA-JJHC-V7C2-5HH6

Impact

Patches

Workarounds

Tags

Sightings

Nomenclature