High
node-ajv — security advisory
ajv (Another JSON Schema Validator) before 8.18.0 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. This issue is also fixed in version 6.14.0.
- Products
- node-ajv
- Affected versions
- 5.0.0-1, 6.10.2-1, 6.12.6-2, 6.12.6-3, 8.12.0~ds+~2.1.1-4, 8.12.0~ds+~2.1.1-5, 8.17.1~ds+~3.0.1+~3.1.0-2, 8.17.1~ds+~3.0.1+~3.1.0-4build1, 8.20.0~ds+~cs6.1.3-1, 8.20.0~ds+~cs7.1.2-1, 8.20.0~ds+~cs7.1.3-1, 8.20.0~ds+~cs7.1.3-3
- Fixed versions
- Not specified
- CVEs
- CVE-2025-69873
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:14 UTC · Revision 1
Source evidence
ajv (Another JSON Schema Validator) before 8.18.0 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. This issue is also fixed in version 6.14.0.
osv:UBUNTU-CVE-2025-69873
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
node-ajv
Fixed versions: Not specified
Complete source record
{
"id": "bdcafc00fc832daecd1f52ca7d7a8384ff2aa8819da5a55c9d79077abdfef3ac",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-69873",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-69873",
"summary": "ajv (Another JSON Schema Validator) before 8.18.0 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. This issue is also fixed in version 6.14.0.",
"evidence": "osv:UBUNTU-CVE-2025-69873",
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"evidence": "/affected/5/versions"
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"severity": "high",
"structured": {
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"aliases": [
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"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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{
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"database_specific": {
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},
"versions": [
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],
"modified": "2026-10-27T04:15:24.697687143Z",
"provider": "osv",
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"references": [
"https://ubuntu.com/security/CVE-2025-69873",
"https://www.cve.org/CVERecord?id=CVE-2025-69873",
"https://github.com/EthanKim88/ethan-cve-disclosures/blob/main/CVE-2025-69873-ajv-ReDoS.md"
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"source_id": "core-osv",
"document_id": 460163,
"published_at": "2026-02-11T19:15:00+00:00"
}