Critical
Deserialization of Untrusted Data in GitLab
Type: advisorySources: OSV
GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-87719
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 03:53 UTC · Revision 1
Source evidence
Deserialization of Untrusted Data in GitLab
core-osv · Original sourcePublished 12 Sept 2026, 02:46 UTC
GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.
osv:CVE-2026-87719
Complete source record
{
"id": "52e51821069413705977fd47202a3f4b85a95683f7ad27c12e76966567c5e294",
"url": "https://osv.dev/vulnerability/CVE-2026-87719",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Deserialization of Untrusted Data in GitLab",
"summary": "GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.",
"evidence": "osv:CVE-2026-87719",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-87719",
"aliases": [
"BIT-gitlab-2026-87719",
"CVE-2026-87719"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://gitlab.com/gitlab-org/gitlab",
"type": "GIT",
"events": [
{
"introduced": "94282cd9b41643ecd8a82da6cf46834cd9609afe"
},
{
"fixed": "4b537b4c2227a44f3f9935e783212b1cf927e961"
},
{
"introduced": "f07e3c5b3c8128be5db112e5b2b618fe31ea1b35"
},
{
"fixed": "28286047c9f2e2a9fd02c6cf0979954241ecc085"
},
{
"introduced": "67581074a0aab1f53cdafe7eead5f5d07f3afec8"
},
{
"fixed": "ec0fce03a55d83fb520d92d1428491e950dd51f4"
},
{
"introduced": "68485a1eb627c9a992f266263157327649822db3"
},
{
"fixed": "684d9581bfefb68c8593331266b69702589d80a3"
},
{
"introduced": "8f83039bebbbb61d3b7b8b7e2342d1deec1e14c6"
},
{
"fixed": "601afd607baae60e14e83e16fb9dea03cf8c7032"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "18.3.0"
},
{
"fixed": "18.11.12"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "19.0.0"
},
{
"fixed": "19.0.9"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "19.1.0"
},
{
"fixed": "19.1.8"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "19.2.0"
},
{
"fixed": "19.2.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "19.3.0"
},
{
"fixed": "19.3.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v19.3.0-ee",
"v19.1.0-ee",
"v19.2.0-ee",
"v19.0.0-ee"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87719.json"
}
}
],
"modified": "2026-10-30T10:30:48.163807866Z",
"provider": "osv",
"references": [
"https://gitlab.com/gitlab-org/gitlab/-/work_items/628160",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87719.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-87719",
"https://hackerone.com/reports/4012289"
],
"provider_metadata": {
"cwe_ids": [
"CWE-502"
],
"cna_assigner": "GitLab",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "18.3"
},
{
"fixed": "18.11.12"
},
{
"introduced": "19.0"
},
{
"fixed": "19.0.9"
},
{
"introduced": "19.1"
},
{
"fixed": "19.1.8"
},
{
"introduced": "19.2"
},
{
"fixed": "19.2.6"
},
{
"introduced": "19.3"
},
{
"fixed": "19.3.2"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
},
{
"extracted_events": [
{
"range": [
{
"introduced": "18.3"
},
{
"fixed": "18.11.12"
},
{
"introduced": "19.0"
},
{
"fixed": "19.0.9"
},
{
"introduced": "19.1"
},
{
"fixed": "19.1.8"
},
{
"introduced": "19.2"
},
{
"fixed": "19.2.6"
},
{
"introduced": "19.3"
},
{
"fixed": "19.3.2"
}
],
"source": "DESCRIPTION"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87719.json"
}
},
"related_cves": [
{
"value": "CVE-2026-87719",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 510030,
"published_at": "2026-09-12T02:46:26.755+00:00"
}