An issue was discovered in ajv.validate() in Ajv (aka Another JSON Schema Validator) 6.12.2.
An issue was discovered in ajv.validate() in Ajv (aka Another JSON Schema Validator) 6.12.2. A carefully crafted JSON schema could be provided that allows execution of other code by prototype pollution. (While untrusted schemas are recommended against, the worst case of an untrusted schema should be a denial of service, not execution of code.)
- Published
- Jul 15, 2020
- Updated
- Jun 16, 2026
- EPSS
- 2.3% · 83th percentile
- CWE
- CWE-1321
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Report tools
Action score
23
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.6 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.3%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| ajv.js | ajv | cpe:2.3:a:ajv.js:ajv |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- ajv.js ajv6.12.2
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | nodejs-nodemon | before 2.0.3-1.module_el8.4.0+2521+c668cc9f | 2.0.3-1.module_el8.4.0+2521+c668cc9f |
| AlmaLinux:8 | nodejs-nodemon | before 1.18.3-1.module_el8.3.0+2023+d2377ea3 | 1.18.3-1.module_el8.3.0+2023+d2377ea3 |
| AlmaLinux:8 | nodejs-nodemon | before 1.18.3-1.module_el8.3.0+2047+b07ac28e | 1.18.3-1.module_el8.3.0+2047+b07ac28e |
| AlmaLinux:8 | nodejs-packaging | before 17-3.module_el8.4.0+2521+c668cc9f | 17-3.module_el8.4.0+2521+c668cc9f |
| AlmaLinux:8 | nodejs-packaging | before 17-3.module_el8.4.0+2224+b07ac28e | 17-3.module_el8.4.0+2224+b07ac28e |
| AlmaLinux:8 | nodejs-packaging | before 23-3.module_el8.5.0+254+b4526b16 | 23-3.module_el8.5.0+254+b4526b16 |
| AlmaLinux:8 | nodejs-packaging | before 17-3.module_el8.3.0+2023+d2377ea3 | 17-3.module_el8.3.0+2023+d2377ea3 |
| AlmaLinux:8 | nodejs-packaging | before 23-3.module_el8.4.0+2522+3bd42762 | 23-3.module_el8.4.0+2522+3bd42762 |
| Debian:12 | node-ajv | before 6.12.4-1 | 6.12.4-1 |
| npm | ajv | before 6.12.3 | 6.12.3 |
| Red Hat:ansible_automation_platform:4.2::el7 | automation-hub | before 0:4.2.2-1.el7pc | 0:4.2.2-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python-bleach | before 0:3.3.0-1.el7pc | 0:3.3.0-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python-bleach-allowlist | before 0:1.0.3-1.el7pc | 0:1.0.3-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python-galaxy-importer | before 0:0.2.15-1.el7pc | 0:0.2.15-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python-galaxy-ng | before 0:4.2.2-1.el7pc | 0:4.2.2-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python-pulp-ansible | before 1:0.5.6-1.el7pc | 1:0.5.6-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python3-bleach | before 0:3.3.0-1.el7pc | 0:3.3.0-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python3-bleach-allowlist | before 0:1.0.3-1.el7pc | 0:1.0.3-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python3-django | before 0:2.2.18-1.el7pc | 0:2.2.18-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python3-galaxy-importer | before 0:0.2.15-1.el7pc | 0:0.2.15-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python3-galaxy-ng | before 0:4.2.2-1.el7pc | 0:4.2.2-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el7 | python3-pulp-ansible | before 1:0.5.6-1.el7pc | 1:0.5.6-1.el7pc |
| Red Hat:ansible_automation_platform:4.2::el8 | automation-hub | before 0:4.2.2-1.el8pc | 0:4.2.2-1.el8pc |
| Red Hat:ansible_automation_platform:4.2::el8 | python-bleach | before 0:3.3.0-1.el8pc | 0:3.3.0-1.el8pc |
+60
Same product
ajv.js: all recordsOther highest-scoring records for the same primary product.
- CVE-2025-69873ajv (Another JSON Schema Validator) before 8.18.0 is vulnerable to Regular Expression Denial of Service (ReDoS) when the $data option is ena11Monitor
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 |
|---|---|---|
| almalinux:nodejs-nodemon | 1.18.3-1.module_el8.3.0+2023+d2377ea3 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:nodejs-packaging | 17-3.module_el8.4.0+2224+b07ac28e · AlmaLinux:8 | Package registry (OSV) |
| debian:node-ajv | 6.12.4-1 · Debian:12 | Package registry (OSV) |
| npm:ajv | 6.12.3 | Package registry (OSV) |
| red hat:nodejs | 1:12.19.1-1.module+el8.3.0+8851+b7b41ca0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-debuginfo | 1:12.19.1-1.module+el8.3.0+8851+b7b41ca0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-debugsource | 1:12.19.1-1.module+el8.3.0+8851+b7b41ca0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-devel | 1:12.19.1-1.module+el8.3.0+8851+b7b41ca0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-docs | 1:12.19.1-1.module+el8.3.0+8851+b7b41ca0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-full-i18n | 1:12.19.1-1.module+el8.3.0+8851+b7b41ca0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:nodejs-nodemon | 0:1.18.3-1.module+el8.1.0+3369+37ae6a45 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:rh-nodejs12-nodejs | 0:12.19.1-2.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-nodejs12-nodejs-debuginfo | 0:12.19.1-2.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-nodejs12-nodejs-devel | 0:12.19.1-2.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-nodejs12-nodejs-docs | 0:12.19.1-2.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| red hat:rh-nodejs12-npm | 0:6.14.8-12.19.1.2.el7 · Red Hat:rhel_software_collections:3::el7 | Package registry (OSV) |
| rocky linux:nodejs-nodemon | 0:1.18.3-1.module+el8.3.0+101+f84c7154 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:nodejs-packaging | 0:17-3.module+el8.3.0+101+f84c7154 · Rocky Linux:8 | 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.
No commit or PR link among the references.
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
- Anyone who can reach it over the internet 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
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- low · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- Low
Weakness class (CWE)
CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
nvd-primary
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/ajv-validator/ajv/releases/tag/v6.12.3
- github.com/ajv-validator/ajv/tags
- hackerone.com/bugs?subject=user&report_id=894259
- security.netapp.com/advisory/ntap-20240621-0007/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.