CVE-2026-59822

CRITICALNVD 8.29.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-09-02), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.2 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, nvd
Trending — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 8.2Exploit: cisa kev · ssvc activeExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key validation with an empty UserAPIKeyAuth() object, allowing requests to reach MCP tooling without a valid LiteLLM key. This issue is fixed in version 1.84.0.

CVSS v3
8.2
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
57%
KEV
⚠ Exploited

Published

July 8, 2026

Last Modified

September 3, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

MCP Authentication Bypass via OAuth2 Passthrough Fallback · Advisory · BerriAI/litellm · GitHub

https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q
github_release Patch Available

v1.84.0

Patch available: BerriAI/litellm v1.84.0

https://github.com/BerriAI/litellm/releases/tag/v1.84.0
github_pr

fix(mcp): tighten public-route detection and OAuth2 fallback gating

Fix merged in BerriAI/litellm PR #26463 on 2026-04-30 — awaiting tagged release

https://github.com/BerriAI/litellm/pull/26463
github_commit

commit 73869f0faf7d (BerriAI/litellm)

Fix landed in BerriAI/litellm commit 73869f0faf7d — awaiting tagged release

https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c

Vendor Advisories for CVE-2026-59822(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
litellm0.1.0 ... 1.9.dev0 (1119 versions)1.84.0—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 61× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 142 total refreshes for this CVE.

  1. 2026-09-18 22:52 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 19:20 UTCCISA KEV update
  4. 2026-09-18 14:15 UTCCISA KEV update
  5. 2026-09-17 22:00 UTCEG score recompute
  6. 2026-09-17 19:31 UTCEPSS rescore
  7. 2026-09-16 16:55 UTCEG score recompute
  8. 2026-09-16 14:10 UTCCISA KEV update
  9. 2026-09-16 14:08 UTCEPSS rescore
  10. 2026-09-16 08:38 UTCEG score recompute
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 03:36 UTCEG score recompute
  13. 2026-09-15 03:11 UTCEPSS rescore
  14. 2026-09-14 19:24 UTCCISA KEV update
  15. 2026-09-13 18:27 UTCEG score recompute
  16. 2026-09-13 16:47 UTCEPSS rescore
  17. 2026-09-12 17:34 UTCEG score recompute
  18. 2026-09-11 18:49 UTCCISA KEV update
  19. 2026-09-11 16:40 UTCEG score recompute
  20. 2026-09-11 14:53 UTCEPSS rescore
  21. 2026-09-11 12:31 UTCEG score recompute
  22. 2026-09-10 19:28 UTCCISA KEV update
  23. 2026-09-10 11:37 UTCEG score recompute
  24. 2026-09-10 09:35 UTCEPSS rescore
  25. 2026-09-09 19:08 UTCCISA KEV update
Show 75 more
  1. 2026-09-08 22:14 UTCEG score recompute
  2. 2026-09-08 22:01 UTCEPSS rescore
  3. 2026-09-08 18:54 UTCCISA KEV update
  4. 2026-09-07 17:02 UTCEG score recompute
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 16:06 UTCEG score recompute
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-05 19:19 UTCEG score recompute
  9. 2026-09-04 17:38 UTCCISA KEV update
  10. 2026-09-04 14:13 UTCEG score recompute
  11. 2026-09-04 05:55 UTCEG score recompute
  12. 2026-09-04 05:07 UTCEPSS rescore
  13. 2026-09-02 18:35 UTCEG score recompute
  14. 2026-09-02 17:35 UTCEG score recompute▲ 0.80
  15. 2026-09-02 17:33 UTCCISA KEV update
  16. 2026-09-02 14:12 UTCEPSS rescore
  17. 2026-09-01 13:54 UTCEPSS rescore
  18. 2026-09-01 04:40 UTCEPSS rescore
  19. 2026-08-30 19:17 UTCEPSS rescore
  20. 2026-08-30 07:29 UTCEG score recompute
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 23:40 UTCEG score recompute
  23. 2026-08-28 21:42 UTCEPSS rescore
  24. 2026-08-27 21:50 UTCEG score recompute
  25. 2026-08-27 14:25 UTCEPSS rescore
  26. 2026-08-27 01:28 UTCEG score recompute
  27. 2026-08-26 14:46 UTCEPSS rescore
  28. 2026-08-26 08:22 UTCEG score recompute
  29. 2026-08-25 13:49 UTCEPSS rescore
  30. 2026-08-24 20:32 UTCEG score recompute
  31. 2026-08-23 03:15 UTCEG score recompute
  32. 2026-08-23 00:19 UTCEPSS rescore
  33. 2026-08-22 03:46 UTCEG score recompute
  34. 2026-08-21 23:49 UTCEPSS rescore
  35. 2026-08-21 03:59 UTCEG score recompute
  36. 2026-08-20 22:55 UTCEPSS rescore
  37. 2026-08-20 01:58 UTCEG score recompute
  38. 2026-08-19 17:04 UTCEPSS rescore
  39. 2026-08-18 20:44 UTCEG score recompute
  40. 2026-08-18 13:48 UTCEPSS rescore
  41. 2026-08-17 15:14 UTCEG score recompute
  42. 2026-08-17 13:47 UTCEPSS rescore
  43. 2026-08-16 15:47 UTCEG score recompute
  44. 2026-08-16 14:56 UTCEPSS rescore
  45. 2026-08-16 04:04 UTCEG score recompute
  46. 2026-08-16 02:14 UTCEPSS rescore
  47. 2026-08-15 04:38 UTCEG score recompute
  48. 2026-08-15 01:30 UTCEPSS rescore
  49. 2026-08-14 05:07 UTCEG score recompute
  50. 2026-08-13 22:00 UTCEPSS rescore
  51. 2026-08-12 17:54 UTCEG score recompute
  52. 2026-08-12 13:51 UTCEPSS rescore
  53. 2026-08-11 18:25 UTCEG score recompute
  54. 2026-08-11 06:42 UTCEG score recompute
  55. 2026-08-11 00:00 UTCEPSS rescore
  56. 2026-08-09 19:33 UTCEG score recompute
  57. 2026-08-09 13:46 UTCEPSS rescore
  58. 2026-08-08 20:07 UTCEG score recompute
  59. 2026-08-08 16:37 UTCEPSS rescore
  60. 2026-08-07 20:40 UTCEG score recompute
  61. 2026-08-06 21:14 UTCEG score recompute
  62. 2026-08-06 13:47 UTCEPSS rescore
  63. 2026-08-05 21:49 UTCEG score recompute
  64. 2026-08-05 19:17 UTCEPSS rescore
  65. 2026-08-04 21:53 UTCEG score recompute
  66. 2026-08-04 15:10 UTCEPSS rescore
  67. 2026-08-04 10:39 UTCEPSS rescore
  68. 2026-08-03 21:20 UTCEG score recompute
  69. 2026-08-03 10:36 UTCEPSS rescore
  70. 2026-08-02 10:09 UTCEG score recompute
  71. 2026-08-02 02:27 UTCEPSS rescore
  72. 2026-08-01 10:43 UTCEG score recompute
  73. 2026-08-01 04:16 UTCEPSS rescore
  74. 2026-07-30 23:07 UTCEG score recompute
  75. 2026-07-30 16:28 UTCEPSS rescore

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Frequently asked(6)

What is CVE-2026-59822?
CVE-2026-59822 is a critical vulnerability published on July 8, 2026. LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key…
When was CVE-2026-59822 disclosed?
CVE-2026-59822 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59822 actively exploited?
Yes. CISA added CVE-2026-59822 to the Known Exploited Vulnerabilities catalog on September 2, 2026, affecting BerriAI LiteLLM. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-59822?
CVE-2026-59822 has a CVSS v3 base score of 8.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-59822?
CVE-2026-59822 affects BerriAI LiteLLM. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-59822?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59822, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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