CVE-2021-42836
HIGHCVSS 7.5/10EPSS 2.25%
Last modified
CVE-2021-42836 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. GJSON before 1.9.3 allows a ReDoS (regular expression denial of service) attack.. EPSS estimates a 2.25% chance of exploitation in the next 30 days.
Description
GJSON before 1.9.3 allows a ReDoS (regular expression denial of service) attack.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gjson Project | Gjson | < 1.9.3 |
References
- https://github.com/tidwall/gjson/commit/590010fdac311cc8990ef5c97448d4fec8f29944Patch, Third Party Advisory
- https://github.com/tidwall/gjson/commit/77a57fda87dca6d0d7d4627d512a630f89a91c96Patch, Third Party Advisory
- https://github.com/tidwall/gjson/compare/v1.9.2...v1.9.3Release Notes, Third Party Advisory
- https://github.com/tidwall/gjson/issues/236Exploit, Issue Tracking, Third Party Advisory
- https://github.com/tidwall/gjson/issues/237Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/tidwall/gjson/commit/590010fdac311cc8990ef5c97448d4fec8f29944Patch, Third Party Advisory
- https://github.com/tidwall/gjson/commit/77a57fda87dca6d0d7d4627d512a630f89a91c96Patch, Third Party Advisory
- https://github.com/tidwall/gjson/compare/v1.9.2...v1.9.3Release Notes, Third Party Advisory
- https://github.com/tidwall/gjson/issues/236Exploit, Issue Tracking, Third Party Advisory
- https://github.com/tidwall/gjson/issues/237Exploit, Issue Tracking, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-42836?
GJSON before 1.9.3 allows a ReDoS (regular expression denial of service) attack.
How severe is CVE-2021-42836?
CVE-2021-42836 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.25% probability of exploitation in the next 30 days.
How do I fix CVE-2021-42836?
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-2021-42836?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST