ajv (Another JSON Schema Validator) before 8.18.0 is vulnerable to Regular Expression Denial of Service (ReDoS) when the $data option is ena
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.
- Published
- Feb 11, 2026
- Updated
- Sep 14, 2026
- EPSS
- 0.5% · 40th percentile
- CWE
- CWE-1333
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Report tools
Action score
11
Monitor
Low priority for now.
- CVSS
- 11 / 40 · 2.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · mitre
- 2.9
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| ansible automation platform | 2.5 | cpe:2.3:redhat:ansible_automation_platform:2.5 |
| ansible automation platform | 2.6 | cpe:2.3:redhat:ansible_automation_platform:2.6 |
| jboss enterprise application platform eus | 7.3 | cpe:2.3:redhat:jboss_enterprise_application_platform_eus:7.3 |
| network observ optr | 1.11 | cpe:2.3:redhat:network_observ_optr:1.11 |
| rhdh | 1.8 | cpe:2.3:redhat:rhdh:1.8 |
| rhdh | 1.9 | cpe:2.3:redhat:rhdh:1.9 |
| edge manager | 1.0 | cpe:2.3:redhat:edge_manager:1.0 |
| edge manager | 1.1 | cpe:2.3:redhat:edge_manager:1.1 |
| openshift ai | 2.16 | cpe:2.3:redhat:openshift_ai:2.16 |
| openshift ai | 3.3 | cpe:2.3:redhat:openshift_ai:3.3 |
| openshift | 4.14 | cpe:2.3:redhat:openshift:4.14 |
| openshift | 4.15 | cpe:2.3:redhat:openshift:4.15 |
and 38 more
Versions reported by the vendor
Affected version ranges reported by the assigning authority (mitre). Independent of NVD's CPE analysis and usually ahead of it.
ajv.js ajv
- before 6.14.0affected · semver
- 7.0.0 and later · before 8.17.2affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | node-ajv | all versions | — |
| Debian:14 | node-ajv | before 8.18.0~ds+~cs6.1.1-1 | 8.18.0~ds+~cs6.1.1-1 |
| npm | ajv | from 7.0.0-alpha.0 · before 8.18.0 | 8.18.0 |
| npm | ajv | before 6.14.0 | 6.14.0 |
| Red Hat:ansible_automation_platform_developer:2.5::el8 | receptor | before 0:1.6.4-2.el8ap | 0:1.6.4-2.el8ap |
| Red Hat:ansible_automation_platform_developer:2.5::el9 | receptor | before 0:1.6.4-2.el9ap | 0:1.6.4-2.el9ap |
| Red Hat:ansible_automation_platform:2.5::el8 | automation-controller-venv-tower | before 0:4.6.28-3.el8ap | 0:4.6.28-3.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | automation-gateway-proxy | before 0:2.5.10-5.el8ap | 0:2.5.10-5.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | automation-gateway-proxy-debugsource | before 0:2.5.10-5.el8ap | 0:2.5.10-5.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | automation-gateway-proxy-server | before 0:2.5.10-5.el8ap | 0:2.5.10-5.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | automation-gateway-proxy-server-debuginfo | before 0:2.5.10-5.el8ap | 0:2.5.10-5.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | automation-gateway-server | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+activitystream | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+api_documentation | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+authentication | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+channel_auth | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+feature_flags | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+jwt_consumer | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+oauth2_provider | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+rbac | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+redis_client | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-django-ansible-base+rest_filters | before 0:2.5.20260422-2.el8ap | 0:2.5.20260422-2.el8ap |
| Red Hat:ansible_automation_platform:2.5::el8 | python3.12-jwcrypto | before 0:1.5.7-1.el8ap | 0:1.5.7-1.el8ap |
+46
Same product
ajv.js: all recordsOther highest-scoring records for the same primary product.
- CVE-2020-15366An issue was discovered in ajv.validate() in Ajv (aka Another JSON Schema Validator) 6.12.2.23Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| ajv.js ajv | 6.14.0 | Vendor (CNA) |
| ajv.js ajv | 8.17.2 | Vendor (CNA) |
| debian:node-ajv | 8.18.0~ds+~cs6.1.1-1 · Debian:14 | Package registry (OSV) |
| npm:ajv | 6.14.0 | Package registry (OSV) |
| npm:ajv | 8.18.0 | Package registry (OSV) |
| red hat:automation-controller-venv-tower | 0:4.6.28-3.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:automation-gateway-server | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-django-ansible-base+activitystream | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-django-ansible-base+api_documentation | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-django-ansible-base+authentication | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-django-ansible-base+channel_auth | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-django-ansible-base+feature_flags | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-django-ansible-base+jwt_consumer | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-django-ansible-base+oauth2_provider | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-django-ansible-base+rbac | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-django-ansible-base+redis_client | 0:2.5.20260422-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
| red hat:python3.12-markdown | 0:3.10.2-1.el8ap · Red Hat:ansible_automation_platform:2.5::el8 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- low · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- Low
Weakness class (CWE)
CWE-1333 · Inefficient Regular Expression ComplexityCVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/EthanKim88/ethan-cve-disclosures/blob/main/CVE-2025-69873-ajv-ReDoS.md
- github.com/advisories/GHSA-2g4f-4pwh-qvx6
- github.com/ajv-validator/ajv/pull/2588
- github.com/ajv-validator/ajv/pull/2590
- github.com/ajv-validator/ajv/releases/tag/v6.14.0
- github.com/github/advisory-database/pull/6991
- access.redhat.com/errata/RHSA-2026:10093
- access.redhat.com/errata/RHSA-2026:13512
- access.redhat.com/errata/RHSA-2026:14774
- access.redhat.com/errata/RHSA-2026:15091
- access.redhat.com/errata/RHSA-2026:16874
- access.redhat.com/errata/RHSA-2026:19712
- access.redhat.com/errata/RHSA-2026:26211
- access.redhat.com/errata/RHSA-2026:26214
- access.redhat.com/errata/RHSA-2026:33371
- access.redhat.com/errata/RHSA-2026:36651
- access.redhat.com/errata/RHSA-2026:40118
- access.redhat.com/errata/RHSA-2026:40945
- access.redhat.com/errata/RHSA-2026:40984
- access.redhat.com/errata/RHSA-2026:41941
Vendor advisories and official records. Exploit/PoC links are deliberately left out.