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HIGH severity

CVE-2020-36066 — gjson

HIGHFix: tidwall/gjson@9f58baa

CVE-2020-36066 is a high-severity (CVSS 7.5) vulnerability in github.com/tidwall/gjson. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for github.com/tidwall/gjson — see the affected versions and patch details below.

github.com/tidwall/gjson is vulnerable to Denial of service

Also known asGHSA-wjm3-fq3r-5x46GO-2022-0957
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.00%0.78%1.56%2.34%0.2%1.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹github.com/tidwall/gjson

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

GJSON <1.6.5 allows attackers to cause a denial of service (remote) via crafted JSON.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/tidwall/gjsonall versions1.6.5go get github.com/tidwall/gjson@v1.6.5

Affected Products

1 product · 1 configurations
Application
gjsongjson_project
< 1.6.5
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

GJSON <1.6.5 allows attackers to cause a denial of service (remote) via …

github.comNVDJan 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/tidwall/gjson, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/tidwall/gjson to 1.6.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-36066 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

GJSON <1.6.5 allows attackers to cause a denial of service (remote) via crafted JSON.
O3 Security · Impact-Aware SCA

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CVE-2020-36066: gjson DoS — Fixed in 1.6.5