CVE-2026-55235
CVE-2026-55235 · langgraph-api: Relative webhook targets in LangGraph Server can reach in-process routes without authentication
This page contains facts from public vulnerability sources. Check the original advisory before updating.
langgraph-api implements the LangGraph API for rapid development and testing. Prior to 0.10.0, langgraph-api permits a run or cron to specify a relative webhook target that is delivered through an in-process loopback transport, and the authentication middleware treats that transport as internal without applying the authentication context used for external requests. In deployments that rely on per-user authorization to separate threads and runs, an authenticated user can direct a webhook to the server's own thread and run routes, allowing creation of a run on or modification of another user's thread and limited incorporation of the targeted thread's metadata into the created run record. The affected path requires webhook targets and per-user authorization boundaries; deployments that deliberately re-enable loopback delivery should restrict it to controlled same-process routes because those webhooks remain unauthenticated. This issue is fixed in version 0.10.0.
CVSS 5.9 · Medium · EPSS 0.4% · Fix available
- Published
- Updated
Stack: python
Affected products and versions
langgraph-api
- Versions
- < 0.10.0: Affected
No fix published
langgraph-api PyPI
- Versions
- 0.0.1
- 0.0.10
- 0.0.11
- 0.0.12
- 0.0.13
- 0.0.14
- 0.0.15
- 0.0.16
- 0.0.17
- 0.0.18
- 0.0.19
- 0.0.2
- 0.0.20
- 0.0.21
- 0.0.22
- 0.0.23
- 0.0.24
- 0.0.25
- 0.0.26
- 0.0.27
- 0.0.28
- 0.0.28rc1
- 0.0.3
- 0.0.30
- 0.0.31
- 0.0.32
- 0.0.33
- 0.0.34
- 0.0.36
- 0.0.37
- 0.0.38
- 0.0.39
- 0.0.4
- 0.0.40
- 0.0.41
- 0.0.42
- 0.0.43
- 0.0.44
- 0.0.45
- 0.0.46
- 0.0.47
- 0.0.48
- 0.0.5
- 0.0.6
- 0.0.7
- 0.0.8
- 0.0.9
- 0.1.0
- 0.1.12
- 0.1.13
- 0.1.14
- 0.1.15
- 0.1.16
- 0.1.17
- 0.1.18
- 0.1.2
- 0.1.20
- 0.1.21
- 0.1.22
- 0.1.23
- 0.1.3
- 0.1.4
- 0.1.5
- 0.1.6
- 0.1.7
- 0.1.8
- 0.1.9
- 0.10.0rc1
- 0.10.0rc2
- 0.10.0rc3
- 0.2.0
- 0.2.1
- 0.2.10
- 0.2.100
- 0.2.102
- 0.2.108
- 0.2.109
- 0.2.11
- 0.2.110
- 0.2.111
- 0.2.113
- 0.2.114
- 0.2.115
- 0.2.117
- 0.2.12
- 0.2.120
- 0.2.123
- 0.2.124
- 0.2.125
- 0.2.126
- 0.2.128
- 0.2.129
- 0.2.13
- 0.2.130
- 0.2.132
- 0.2.134
- 0.2.135
- 0.2.137
- 0.2.14
- 0.2.15
- 0.2.16
- 0.2.17
- 0.2.18
- 0.2.19
- 0.2.2
- 0.2.20
- 0.2.21
- 0.2.23
- 0.2.24
- 0.2.25
- 0.2.26
- 0.2.27
- 0.2.28
- 0.2.29
- 0.2.3
- 0.2.30
- 0.2.32
- 0.2.34
- 0.2.35
- 0.2.36
- 0.2.37
- 0.2.38
- 0.2.39
- 0.2.4
- 0.2.40
- 0.2.42
- 0.2.43
- 0.2.44
- 0.2.45
- 0.2.46
- 0.2.48
- 0.2.5
- 0.2.51
- 0.2.54
- 0.2.56
- 0.2.6
- 0.2.60
- 0.2.61
- 0.2.63
- 0.2.64
- 0.2.66
- 0.2.67
- 0.2.68
- 0.2.69
- 0.2.7
- 0.2.70
- 0.2.71
- 0.2.72
- 0.2.75
- 0.2.76
- 0.2.77
- 0.2.78
- 0.2.8
- 0.2.83
- 0.2.85
- 0.2.86
- 0.2.88
- 0.2.89
- 0.2.9
- 0.2.92
- 0.2.94
- 0.2.95
- 0.2.96
- 0.2.97
- 0.2.98
- 0.2.99
- 0.3.0
- 0.3.1
- 0.3.4
- 0.4.0
- 0.4.1
- 0.4.11
- 0.4.14
- 0.4.15
- 0.4.16
- 0.4.17
- 0.4.18
- 0.4.19
- 0.4.20
- 0.4.21
- 0.4.22
- 0.4.23
- 0.4.24
- 0.4.25
- 0.4.26
- 0.4.27
- 0.4.28
- 0.4.29
- 0.4.30
- 0.4.31
- 0.4.32
- 0.4.33
- 0.4.34
- 0.4.35
- 0.4.36
- 0.4.37
- 0.4.38
- 0.4.39
- 0.4.40
- 0.4.41
- 0.4.42
- 0.4.43
- 0.4.44
- 0.4.45
- 0.4.46
- 0.4.47
- 0.4.48
- 0.4.7
- 0.4.9
- 0.5.0
- 0.5.1
- 0.5.10
- 0.5.11
- 0.5.12
- 0.5.13
- 0.5.14
- 0.5.15
- 0.5.16
- 0.5.17
- 0.5.18
- 0.5.19
- 0.5.2
- 0.5.20
- 0.5.21
- 0.5.22
- 0.5.23
- 0.5.24
- 0.5.25
- 0.5.26
- 0.5.27
- 0.5.28
- 0.5.29
- 0.5.3
- 0.5.30
- 0.5.31
- 0.5.32
- 0.5.33
- 0.5.34
- 0.5.35
- 0.5.36
- 0.5.37
- 0.5.38
- 0.5.39
- 0.5.4
- 0.5.40
- 0.5.41
- 0.5.42
- 0.5.5
- 0.5.6
- 0.5.7
- 0.5.8
- 0.5.9
- 0.6.0
- 0.6.1
- 0.6.10
- 0.6.11
- 0.6.12
- 0.6.13
- 0.6.14
- 0.6.15
- 0.6.16
- 0.6.17
- 0.6.18
- 0.6.19
- 0.6.2
- 0.6.20
- 0.6.21
- 0.6.22
- 0.6.23
- 0.6.24
- 0.6.25
- 0.6.26
- 0.6.27
- 0.6.28
- 0.6.29
- 0.6.3
- 0.6.30
- 0.6.31
- 0.6.32
- 0.6.33
- 0.6.34
- 0.6.35
- 0.6.36
- 0.6.37
- 0.6.38
- 0.6.39
- 0.6.4
- 0.6.5
- 0.6.6
- 0.6.7
- 0.6.8
- 0.6.9
- 0.7.0
- 0.7.1
- 0.7.100
- 0.7.101
- 0.7.102
- 0.7.103
- 0.7.12
- 0.7.13
- 0.7.14
- 0.7.15
- 0.7.16
- 0.7.17
- 0.7.18
- 0.7.19
- 0.7.2
- 0.7.21
- 0.7.22
- 0.7.23
- 0.7.24
- 0.7.25
- 0.7.26
- 0.7.27
- 0.7.28
- 0.7.29
- 0.7.3
- 0.7.30
- 0.7.31
- 0.7.32
- 0.7.33
- 0.7.34
- 0.7.35
- 0.7.36
- 0.7.37
- 0.7.38
- 0.7.39
- 0.7.4
- 0.7.40
- 0.7.41
- 0.7.42
- 0.7.43
- 0.7.44
- 0.7.45
- 0.7.46
- 0.7.47
- 0.7.48
- 0.7.49
- 0.7.5
- 0.7.50
- 0.7.51
- 0.7.52
- 0.7.53
- 0.7.54
- 0.7.55
- 0.7.56
- 0.7.57
- 0.7.58
- 0.7.59
- 0.7.6
- 0.7.60
- 0.7.61
- 0.7.62
- 0.7.63
- 0.7.64
- 0.7.65
- 0.7.66
- 0.7.67
- 0.7.68
- 0.7.69
- 0.7.7
- 0.7.70
- 0.7.71
- 0.7.72
- 0.7.73
- 0.7.74
- 0.7.75
- 0.7.76
- 0.7.77
- 0.7.78
- 0.7.79
- 0.7.8
- 0.7.80
- 0.7.81
- 0.7.82
- 0.7.83
- 0.7.84
- 0.7.85
- 0.7.86
- 0.7.87
- 0.7.88
- 0.7.89
- 0.7.9
- 0.7.90
- 0.7.91
- 0.7.92
- 0.7.93
- 0.7.94
- 0.7.95
- 0.7.96
- 0.7.97
- 0.7.98
- 0.7.99
- 0.8.0
- 0.8.1
- 0.8.2
- 0.8.3
- 0.8.4
- 0.8.5
- 0.8.6
- 0.8.7
- 0.9.0
- 0.9.0.dev1
- 0.9.0.dev2
- 0.9.0.dev3
- 0.9.0.dev4
- 0.9.0.dev5
- 0.9.0.dev6
- 0.9.0rc1
- 0.9.1
- Affected ranges
- ECOSYSTEM: < 0.10.0
Update to 0.10.0