CVE-2021-3918
CRITICALCVSS 9.8/10EPSS 3.56%
Last modified
CVE-2021-3918 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. json-schema is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'). EPSS estimates a 3.56% chance of exploitation in the next 30 days.
Description
json-schema is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Json-Schema Project | Json-Schema | < 0.4.0 |
| Debian | Debian Linux | 10.0 |
References
- https://github.com/kriszyp/json-schema/commit/22f146111f541d9737e832823699ad3528ca7741Patch, Third Party Advisory
- https://huntr.dev/bounties/bb6ccd63-f505-4e3a-b55f-cd2662c261a9Exploit, Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00013.htmlMailing List, Third Party Advisory
- https://github.com/kriszyp/json-schema/commit/22f146111f541d9737e832823699ad3528ca7741Patch, Third Party Advisory
- https://huntr.dev/bounties/bb6ccd63-f505-4e3a-b55f-cd2662c261a9Exploit, Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00013.htmlMailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3918?
json-schema is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
How severe is CVE-2021-3918?
CVE-2021-3918 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.56% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3918?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3918?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST