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[GHSA-2g4f-4pwh-qvx6] ajv has ReDoS when using $data option #6991

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Merged
advisory-database merged 1 commit into from
Feb 20, 2026
Merged

[GHSA-2g4f-4pwh-qvx6] ajv has ReDoS when using $data option #6991

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39 changes: 35 additions & 4 deletions advisories/github-reviewed/2026/02/GHSA-2g4f-4pwh-qvx6/GHSA-2g4f-4pwh-qvx6.json
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Original file line number Diff line number Diff line change
@@ -1,17 +1,17 @@
{
"schema_version": "1.4.0",
"id": "GHSA-2g4f-4pwh-qvx6",
"modified": "2026-02-17T18:10:29Z",
"modified": "2026-02-17T18:13:07Z",
"published": "2026-02-11T21:30:39Z",
"aliases": [
"CVE-2025-69873"
],
"summary": "ajv has ReDoS when using $data option",
"summary": "ajv has ReDoS when using `$data` option",
"details": "ajv (Another JSON Schema Validator) through version 8.17.1 is vulnerable to Regular Expression Denial of Service (ReDoS) when the `$data` option is enabled. The pattern keyword accepts runtime data via JSON Pointer syntax (`$data` reference), which is passed directly to the JavaScript `RegExp()` constructor without validation. An attacker can inject a malicious regex pattern (e.g., `\\\"^(a|a)*$\\\"`) combined with crafted input to cause catastrophic backtracking. A 31-character payload causes approximately 44 seconds of CPU blocking, with each additional character doubling execution time. This enables complete denial of service with a single HTTP request against any API using ajv with `$data`: true for dynamic schema validation.",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
}
],
"affected": [
Expand All @@ -25,14 +25,33 @@
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
"introduced": "7.0.0"
},
{
"fixed": "8.18.0"
}
]
}
]
},
{
"package": {
"ecosystem": "npm",
"name": "ajv"
},
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.14.0"
}
]
}
]
}
],
"references": [
Expand All @@ -44,10 +63,18 @@
"type": "WEB",
"url": "https://github.com/ajv-validator/ajv/pull/2586"
},
{
"type": "WEB",
"url": "https://github.com/ajv-validator/ajv/pull/2588"
},
{
"type": "WEB",
"url": "https://github.com/ajv-validator/ajv/commit/720a23fa453ffae8340e92c9b0fe886c54cfe0d5"
},
{
"type": "WEB",
"url": "https://github.com/ajv-validator/ajv/commit/b552ed66191eb338498df3196065c777e3bb71f2"
},
{
"type": "WEB",
"url": "https://github.com/EthanKim88/ethan-cve-disclosures/blob/main/CVE-2025-69873-ajv-ReDoS.md"
Expand All @@ -56,6 +83,10 @@
"type": "PACKAGE",
"url": "https://github.com/ajv-validator/ajv"
},
{
"type": "WEB",
"url": "https://github.com/ajv-validator/ajv/releases/tag/v6.14.0"
},
{
"type": "WEB",
"url": "https://github.com/ajv-validator/ajv/releases/tag/v8.18.0"
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