PYSEC-2026-390

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/litellm/PYSEC-2026-390.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-390
Aliases
Published
2026-06-29T11:50:47.498250Z
Modified
2026-06-29T12:15:29.087184446Z
Severity
  • 9.4 (Critical) CVSS_V4 - 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 CVSS Calculator
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.

References

Affected packages

PyPI / litellm

Package

Name
litellm
View open source insights on deps.dev
Purl
pkg:pypi/litellm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.83.0

Affected versions

0.*
0.1.0
0.1.1
0.1.2
0.1.3
0.1.31
0.1.32
0.1.34
0.1.201
0.1.202
0.1.203
0.1.204
0.1.205
0.1.206
0.1.207
0.1.208
0.1.209
0.1.210
0.1.211
0.1.212
0.1.213
0.1.214
0.1.215
0.1.216
0.1.217
0.1.218
0.1.219
0.1.220
0.1.221
0.1.222
0.1.223
0.1.224
0.1.225
0.1.226
0.1.227
0.1.228
0.1.229
0.1.230
0.1.231
0.1.232
0.1.233
0.1.234
0.1.235
0.1.236
0.1.237
0.1.238
0.1.330
0.1.331
0.1.341
0.1.343
0.1.345
0.1.347
0.1.348
0.1.349
0.1.351
0.1.352
0.1.353
0.1.354
0.1.356
0.1.360
0.1.361
0.1.362
0.1.363
0.1.364
0.1.365
0.1.366
0.1.367
0.1.368
0.1.369
0.1.370
0.1.371
0.1.372
0.1.373
0.1.375
0.1.376
0.1.379
0.1.380
0.1.381
0.1.383
0.1.384
0.1.385
0.1.386
0.1.387
0.1.388
0.1.389
0.1.392
0.1.393
0.1.394
0.1.398
0.1.399
0.1.400
0.1.401
0.1.402
0.1.403
0.1.404
0.1.405
0.1.410
0.1.411
0.1.412
0.1.415
0.1.419
0.1.420
0.1.421
0.1.422
0.1.424
0.1.425
0.1.426
0.1.429
0.1.433
0.1.434
0.1.435
0.1.436
0.1.437
0.1.438
0.1.439
0.1.440
0.1.441
0.1.442
0.1.443
0.1.444
0.1.445
0.1.446
0.1.447
0.1.448
0.1.449
0.1.450
0.1.451
0.1.452
0.1.456
0.1.457
0.1.459
0.1.460
0.1.461
0.1.464
0.1.465
0.1.475
0.1.477
0.1.479
0.1.480
0.1.481
0.1.482
0.1.486
0.1.487
0.1.488
0.1.490
0.1.491
0.1.492
0.1.493
0.1.494
0.1.495
0.1.497
0.1.500
0.1.501
0.1.504
0.1.507
0.1.508
0.1.509
0.1.510
0.1.511
0.1.512
0.1.516
0.1.517
0.1.518
0.1.520
0.1.525
0.1.530
0.1.531
0.1.533
0.1.535
0.1.536
0.1.537
0.1.538
0.1.544
0.1.546
0.1.547
0.1.548
0.1.549
0.1.550
0.1.551
0.1.552
0.1.553
0.1.554
0.1.555
0.1.556
0.1.557
0.1.558
0.1.559
0.1.560
0.1.561
0.1.562
0.1.563
0.1.567
0.1.568
0.1.569
0.1.570
0.1.574
0.1.578
0.1.580
0.1.582
0.1.583
0.1.585
0.1.586
0.1.587
0.1.590
0.1.591
0.1.593
0.1.595
0.1.596
0.1.597
0.1.598
0.1.600
0.1.601
0.1.604
0.1.605
0.1.607
0.1.609
0.1.610
0.1.615
0.1.618
0.1.619
0.1.620
0.1.621
0.1.623
0.1.624
0.1.625
0.1.626
0.1.629
0.1.630
0.1.631
0.1.632
0.1.634
0.1.635
0.1.636
0.1.638
0.1.639
0.1.641
0.1.642
0.1.643
0.1.644
0.1.645
0.1.646
0.1.647
0.1.648
0.1.649
0.1.650
0.1.651
0.1.652
0.1.674
0.1.680
0.1.681
0.1.683
0.1.685
0.1.686
0.1.687
0.1.689
0.1.690
0.1.692
0.1.693
0.1.696
0.1.697
0.1.698
0.1.700.dev0
0.1.700.dev1
0.1.700.dev2
0.1.700.dev3
0.1.700.dev4
0.1.700.dev5
0.1.700
0.1.702
0.1.704
0.1.706
0.1.714.dev1
0.1.714
0.1.715
0.1.716
0.1.719
0.1.720
0.1.721
0.1.723
0.1.724
0.1.729
0.1.736
0.1.738
0.1.743
0.1.745
0.1.746
0.1.747
0.1.748
0.1.749
0.1.750
0.1.751
0.1.758
0.1.765
0.1.769
0.1.772
0.1.774
0.1.780
0.1.781
0.1.784
0.1.786
0.1.788
0.1.789
0.1.793
0.1.794
0.1.805
0.1.806
0.1.807
0.1.813
0.1.814
0.1.815
0.1.816
0.1.817
0.1.818
0.1.819
0.1.820
0.1.821
0.1.824
0.1.2291
0.1.7701
0.1.7713
0.2.5
0.2.6
0.3.0
0.3.1
0.4.0
0.4.4
0.5.2
0.5.3
0.5.4
0.5.6
0.6.0
0.6.1
0.6.2
0.6.6
0.7.1.dev1
0.7.1.dev2
0.7.1.dev3
0.7.1
0.7.3
0.7.4
0.7.5
0.7.9
0.7.10
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.8.6
0.9.0
0.9.1
0.9.2.dev1
0.9.2
0.10.0
0.10.1
0.11.1
0.12.4.dev1
0.12.4.dev2
0.12.4
0.12.5.dev1
0.12.5
0.12.7.dev1
0.12.7
0.12.8
0.12.9
0.12.10
0.12.11
0.12.12
0.13.0
0.13.1.dev1
0.13.1.dev2
0.13.1.dev3
0.13.1
0.13.2.dev1
0.13.2
0.13.3.dev1
0.13.3.dev2
0.13.6.dev1
0.13.6.dev2
0.13.6.dev3
0.13.7.dev1
0.14.0.dev1
0.14.0
0.14.1
1.*
1.0.0.dev1
1.0.0
1.0.3.dev1
1.0.3
1.1.0
1.1.1
1.1.2
1.1.3
1.2.0
1.3.1
1.3.3.dev1
1.3.3.dev2
1.3.3.dev3
1.3.3
1.4.0
1.6.0
1.7.1
1.7.2
1.7.3
1.7.4
1.7.5
1.7.6
1.7.7
1.7.8
1.7.9
1.7.11
1.7.12
1.8.1
1.9.dev0
1.9.0
1.9.1
1.9.2
1.9.3
1.9.4
1.9.5
1.10.dev11
1.10.0
1.10.1
1.10.2
1.10.3
1.10.4
1.10.6
1.10.8
1.10.9
1.10.10
1.10.11
1.11.0
1.11.1
1.12.0
1.12.1
1.12.2
1.12.3
1.12.5.dev1
1.12.5
1.12.6.dev1
1.12.6.dev2
1.12.6.dev3
1.12.6.dev4
1.12.6.dev5
1.13.2
1.14.0.dev1
1.14.0
1.14.1
1.14.2
1.14.3
1.14.4
1.14.5.dev1
1.14.5
1.14.6
1.14.7
1.14.8
1.14.9
1.14.10
1.15.0
1.15.1
1.15.2
1.15.3
1.15.6
1.15.7
1.15.8
1.15.10
1.16.0
1.16.1
1.16.2
1.16.3
1.16.4
1.16.5
1.16.6
1.16.7
1.16.8
1.16.9
1.16.11
1.16.12
1.16.18
1.16.19
1.16.20
1.16.21
1.17.0
1.17.2
1.17.3
1.17.4
1.17.5
1.17.9
1.18.0
1.18.1
1.18.2
1.18.6
1.18.7
1.18.8
1.18.13.dev1
1.18.13.dev4
1.18.13.dev5
1.18.13
1.18.14.dev8
1.19.4
1.20.0
1.20.5
1.20.6
1.20.7
1.20.8
1.20.9
1.21.4.dev1
1.21.6
1.21.7
1.22.3
1.22.5
1.23.0
1.23.1
1.23.2
1.23.3
1.23.5
1.23.15
1.23.16
1.24.3
1.24.5
1.25.0
1.25.1
1.25.2
1.26.0
1.26.1
1.26.3
1.26.8
1.26.13
1.27.1.dev9
1.27.1.dev11
1.27.1.dev30
1.27.1.dev31
1.27.1.dev40
1.27.1.dev50
1.27.1.dev60
1.27.4
1.27.6
1.27.8
1.28.0
1.28.1
1.28.4
1.28.10
1.28.11
1.28.13
1.29.1
1.29.3
1.29.4.dev1
1.29.7.dev3
1.30.0
1.30.1.dev5
1.30.1.dev6
1.30.1
1.30.3
1.30.7
1.31.2.dev10
1.31.2
1.31.3
1.31.6
1.31.8
1.31.13.dev1
1.31.13.dev2
1.31.13.dev3
1.31.13.dev10
1.31.14.dev2
1.31.14.dev3
1.31.14.dev4
1.31.14.dev5
1.31.14.dev6
1.31.14.dev8
1.31.14.dev9
1.31.14
1.31.15.dev2
1.31.17
1.32.1
1.32.4
1.32.5.dev1
1.32.9
1.33.4
1.33.5.dev1
1.33.9
1.34.0
1.34.1
1.34.3
1.34.4
1.34.6
1.34.8
1.34.11
1.34.16
1.34.18
1.34.21
1.34.22
1.34.25
1.34.29
1.34.37
1.34.39
1.34.42
1.35.0.dev1
1.35.0
1.35.1
1.35.2
1.35.3
1.35.5
1.35.7
1.35.8
1.35.12
1.35.17
1.35.18
1.35.20
1.35.21
1.35.22
1.35.23
1.35.26
1.35.28
1.35.31
1.35.32
1.35.35
1.35.36
1.35.38
1.36.0
1.36.1
1.36.2
1.36.4
1.37.0
1.37.2
1.37.3
1.37.7
1.37.9
1.37.12
1.37.14
1.37.16
1.37.19
1.37.20
1.38.0
1.38.1
1.38.3
1.38.4
1.38.5
1.38.7
1.38.8
1.38.10
1.38.11
1.38.12
1.39.2
1.39.3
1.39.4
1.39.5.dev1
1.39.5
1.39.6
1.40.0.dev1
1.40.0
1.40.1.dev1
1.40.1
1.40.2
1.40.3
1.40.4
1.40.5
1.40.6
1.40.7
1.40.8
1.40.9
1.40.10
1.40.11
1.40.12
1.40.13
1.40.14
1.40.15
1.40.16
1.40.17
1.40.19
1.40.20
1.40.21
1.40.22
1.40.24
1.40.25
1.40.26
1.40.27
1.40.28
1.40.29
1.40.31
1.41.0
1.41.1
1.41.2
1.41.3
1.41.4
1.41.5
1.41.6
1.41.7
1.41.8
1.41.11
1.41.12
1.41.13
1.41.14
1.41.15.dev2
1.41.15
1.41.17
1.41.18
1.41.19
1.41.20
1.41.21
1.41.22
1.41.23
1.41.24
1.41.25
1.41.26
1.41.27
1.41.28
1.42.0
1.42.1
1.42.2
1.42.3
1.42.4
1.42.5
1.42.6
1.42.7
1.42.8
1.42.9
1.42.10
1.42.11
1.42.12
1.43.0
1.43.1
1.43.2
1.43.3
1.43.4
1.43.5
1.43.6
1.43.7
1.43.9
1.43.10
1.43.12
1.43.13
1.43.15
1.43.16
1.43.17
1.43.18
1.43.19
1.44.1
1.44.2
1.44.3
1.44.4
1.44.5
1.44.6
1.44.7
1.44.8
1.44.9
1.44.10
1.44.11
1.44.12
1.44.13
1.44.14
1.44.15
1.44.16
1.44.17
1.44.18
1.44.19
1.44.21
1.44.22
1.44.23
1.44.24
1.44.25
1.44.26
1.44.27
1.44.28
1.45.0
1.46.0
1.46.1
1.46.2
1.46.4
1.46.5
1.46.6
1.46.7
1.46.8
1.47.0
1.47.1
1.47.2
1.48.0
1.48.1
1.48.2
1.48.3
1.48.4
1.48.5
1.48.6
1.48.7
1.48.8
1.48.9
1.48.10
1.48.11
1.48.12
1.48.14
1.48.15
1.48.16
1.48.17
1.48.18
1.48.19
1.49.0
1.49.1
1.49.2
1.49.3
1.49.4
1.49.5
1.49.6
1.49.7
1.50.0
1.50.1
1.50.2
1.50.4
1.51.0
1.51.1
1.51.2
1.51.3
1.52.0
1.52.1
1.52.2
1.52.3
1.52.4
1.52.5
1.52.6
1.52.8
1.52.9
1.52.10
1.52.11
1.52.12
1.52.14
1.52.15
1.52.16
1.53.1.dev1
1.53.1
1.53.2
1.53.3
1.53.4
1.53.5
1.53.6
1.53.7
1.53.8
1.53.9
1.54.0
1.54.1
1.55.0
1.55.1
1.55.2
1.55.3
1.55.4
1.55.6
1.55.7
1.55.8
1.55.9
1.55.10
1.55.11
1.55.12
1.56.2
1.56.3
1.56.4
1.56.5
1.56.6
1.56.8.dev4
1.56.8.dev5
1.56.8.dev6
1.56.8.dev7
1.56.8
1.56.9
1.56.10
1.57.0
1.57.1
1.57.2
1.57.3
1.57.4
1.57.5
1.57.7.dev1
1.57.7
1.57.8
1.57.10
1.57.11
1.58.0
1.58.1
1.58.2
1.58.4
1.59.0
1.59.1.dev1
1.59.1
1.59.2
1.59.3
1.59.5
1.59.6
1.59.7
1.59.8
1.59.9
1.59.10.dev1
1.59.10
1.59.12
1.60.0
1.60.2
1.60.4
1.60.5
1.60.6
1.60.7
1.60.8
1.60.9
1.61.0.dev1
1.61.0
1.61.1
1.61.2
1.61.3
1.61.4
1.61.5
1.61.6
1.61.7
1.61.8
1.61.9
1.61.11
1.61.13
1.61.15
1.61.16
1.61.17
1.61.19
1.61.20
1.62.1
1.62.4
1.63.0.dev12
1.63.0
1.63.2
1.63.3
1.63.4.dev1
1.63.5
1.63.6
1.63.7
1.63.8
1.63.11.dev1
1.63.11
1.63.12
1.63.14
1.64.1
1.65.0
1.65.0.post1
1.65.1
1.65.3
1.65.4
1.65.4.post1
1.65.5
1.65.6
1.65.7
1.65.8
1.66.0
1.66.1
1.66.2
1.66.3
1.67.0
1.67.0.post1
1.67.1
1.67.2
1.67.4.dev1
1.67.4
1.67.4.post1
1.67.5
1.67.6
1.68.0
1.68.1.dev1
1.68.1
1.68.2
1.69.0
1.69.1
1.69.2
1.69.3
1.70.0
1.70.2
1.70.4
1.71.0
1.71.1
1.71.2
1.71.3
1.72.0
1.72.1
1.72.2
1.72.2.post1
1.72.3
1.72.4
1.72.5.dev1
1.72.5.dev2
1.72.5.dev3
1.72.6
1.72.6.post1
1.72.6.post2
1.72.7.dev1
1.72.7.dev7
1.72.7
1.72.9
1.73.0rc1
1.73.0
1.73.0.post1
1.73.1
1.73.2
1.73.6rc2
1.73.6
1.73.6.post1
1.73.7.dev1
1.73.7.dev2
1.73.7.dev3
1.73.7.dev4
1.73.7
1.74.0
1.74.0.post1
1.74.0.post2
1.74.1
1.74.2
1.74.3rc1
1.74.3rc2
1.74.3rc3
1.74.3
1.74.3.post1
1.74.4.dev1
1.74.4
1.74.6
1.74.7rc1
1.74.7
1.74.7.post1
1.74.7.post2
1.74.8.dev2
1.74.8
1.74.9.dev1
1.74.9.dev2
1.74.9
1.74.9.post1
1.74.9.post2
1.74.12
1.74.14
1.74.15
1.74.15.post1
1.74.15.post2
1.75.0
1.75.2
1.75.3
1.75.4
1.75.5.post1
1.75.5.post2
1.75.6
1.75.7
1.75.8
1.75.9
1.76.0
1.76.1
1.76.2
1.76.3
1.77.0
1.77.1
1.77.2.post1
1.77.3
1.77.4.dev1
1.77.4
1.77.5
1.77.7
1.78.0rc2
1.78.0
1.78.2
1.78.3
1.78.4
1.78.5
1.78.6
1.78.7
1.79.0.dev1
1.79.0.dev2
1.79.0.dev3
1.79.0
1.79.1
1.79.2
1.79.3.dev8
1.79.3
1.80.0
1.80.5
1.80.6
1.80.7
1.80.8
1.80.9
1.80.10
1.80.11
1.80.12
1.80.13
1.80.15
1.80.16
1.80.17
1.81.0
1.81.1
1.81.3
1.81.4
1.81.5
1.81.6
1.81.7
1.81.8
1.81.9.dev1
1.81.9
1.81.10
1.81.11
1.81.12
1.81.13
1.81.14
1.81.15
1.81.16
1.82.0
1.82.1
1.82.2
1.82.3
1.82.4
1.82.5
1.82.6

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/litellm/PYSEC-2026-390.yaml"