PYSEC-2026-390

Vulnerability from pysec - Published: 2026-06-29 11:50 - Updated: 2026-06-29 12:05
VLAI
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.

Impacted products
Name purl
litellm

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "litellm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.83.0"
            }
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          "type": "ECOSYSTEM"
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        "1.9.5",
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      ]
    }
  ],
  "aliases": [
    "CVE-2026-35030",
    "GHSA-jjhc-v7c2-5hh6"
  ],
  "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": "PYSEC-2026-390",
  "modified": "2026-06-29T12:05:33.663318Z",
  "published": "2026-06-29T11:50:47.498250Z",
  "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"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/litellm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-jjhc-v7c2-5hh6"
    }
  ],
  "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"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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