CVE-2021-42836

Name: CVE-2021-42836
Creator: NVD / NIST
Published: 2021-10-22T18:15:14.897+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.25%

Last modified Jun 17, 2026

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

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.25%

80.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

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: Oct 22, 2021
Last Modified: Jun 17, 2026
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.

Are you affected by CVE-2021-42836?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST