CVE-2026-86099

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Source
https://cve.org/CVERecord?id=CVE-2026-86099
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86099.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-86099
Published
2026-09-09T13:31:59Z
Modified
2026-09-11T03:48:42Z
Severity
  • 8.8 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Chainlit through 2.12.0 Path Traversal via socket.io sessionId
Details

Chainlit through 2.12.0 fails to validate the client-supplied socket.io sessionId parameter, allowing unauthenticated attackers to traverse filesystem paths by injecting absolute or relative path sequences. Attackers can craft malicious sessionId values that escape the upload directory and recursively delete arbitrary directories accessible to the service process.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86099.json"
}
References

Affected packages

Git / github.com/chainlit/chainlit

Affected ranges

Type
GIT
Repo
https://github.com/chainlit/chainlit
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0565fd0eccb915fce159929598b053ed79f6e0c9
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "2.12.0"
        },
        {
            "fixed": "2.12.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ]
}

Affected versions

0.*
0.1.1
0.1.101
0.1.102
0.1.103
0.2.0
0.2.1
0.2.101
0.2.102
0.2.103
0.2.104
0.2.105
0.2.106
0.2.107
0.2.108
0.2.109
0.2.110
0.2.111
0.3.0
0.4.0
0.4.1
0.4.101
0.4.2
0.4.3
0.5.0
0.5.1
0.5.2
0.6.0
0.6.1
0.6.2
0.6.3
0.6.4
0.6.401
0.6.402
0.7.0
0.7.1
0.7.2
0.7.3
0.7.301
0.7.400
0.7.500
0.7.501
0.7.600rc0
0.7.600rc1
0.7.601rc0
0.7.602
0.7.602rc0
0.7.603
0.7.604
0.7.604rc0
0.7.604rc1
0.7.604rc2
0.7.700
1.*
1.0.0
1.0.0rc0
1.0.0rc1
1.0.0rc2
1.0.0rc3
1.0.100
1.0.101
1.0.200
1.0.300
1.0.301
1.0.400
1.0.401
1.0.500
1.0.501
1.0.502
1.0.503
1.0.504
1.0.505
1.0.506
1.1.0
1.1.0rc0
1.1.0rc1
1.1.101
1.1.200
1.1.201
1.1.202
1.1.300
1.1.300rc0
1.1.300rc1
1.1.300rc2
1.1.300rc3
1.1.300rc4
1.1.300rc5
1.1.301
1.1.302
1.1.303
1.1.304
1.1.305
1.1.306
1.1.306-fix
1.1.400
1.1.400rc0
1.1.400rc1
1.1.401
1.1.402
1.1.403rc0
1.1.404
1.2.0
1.3.0rc0
2.*
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.601
2.0.602
2.0.603
2.0.dev0
2.0.dev2
2.0dev1
2.0rc1
2.1.0
2.1.1
2.1.2
2.10.0
2.10.1
2.11.0
2.11.1
2.2.0
2.2.1
2.3.0
2.4.0
2.4.0rc0
2.4.1
2.4.2
2.4.201
2.4.3
2.4.301
2.4.302
2.4.400
2.5.5
2.6.0
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
2.6.6
2.6.7
2.6.8
2.6.9
2.7.0
2.7.1
2.7.1.1
2.7.2
2.8.0
2.8.1
2.8.2
2.8.3
2.8.4
2.8.5
2.9.0
2.9.1
2.9.2
2.9.3
2.9.4
2.9.5
2.9.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86099.json"