What’s Vulnerable › Vulnerabilities

CVE-2021-42836

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-22 · updated 2026-06-17
• Weakness: CWE-400

Description

GJSON before 1.9.3 allows a ReDoS (regular expression denial of service) attack.

Affected products

• Gjson Project Gjson: before 1.9.3 — fixed in 1.9.3

How to fix

Upgrade to a fixed version: Gjson Project Gjson 1.9.3. Check the vendor advisory for mitigations.

References

• https://github.com/tidwall/gjson/commit/590010fdac311cc8990ef5c97448d4fec8f29944
• https://github.com/tidwall/gjson/commit/77a57fda87dca6d0d7d4627d512a630f89a91c96
• https://github.com/tidwall/gjson/compare/v1.9.2...v1.9.3
• https://github.com/tidwall/gjson/issues/236
• https://github.com/tidwall/gjson/issues/237
• https://github.com/tidwall/gjson/commit/590010fdac311cc8990ef5c97448d4fec8f29944
• https://github.com/tidwall/gjson/commit/77a57fda87dca6d0d7d4627d512a630f89a91c96
• https://github.com/tidwall/gjson/compare/v1.9.2...v1.9.3
• https://github.com/tidwall/gjson/issues/236
• https://github.com/tidwall/gjson/issues/237

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