CVE-2020-36066

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

7.5 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.84%Up 1.3 points since Apr 14, 2021

What each source reports

CVE List Score used 7.5

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

Record: CVE-2020-36066
CVSS 3.1: 7.5 HighCVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
Updated: 2026-11-02

EUVDEUVD-2021-1221 7.5

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

Record: EUVD-2021-1221
CVSS 3.1: 7.5 HighCVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-wjm3-fq3r-5x46 7.5

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

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

Record: GHSA-wjm3-fq3r-5x46
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400
Updated: 2026-11-02

NVD 7.5

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

Record: CVE-2020-36066
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Updated: 2026-11-02

OSV 7.5

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

Record: CVE-2020-36066
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2020-36066 7.5

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

Record: DEBIAN-CVE-2020-36066
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVGHSA-wjm3-fq3r-5x46 7.5

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

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

Record: GHSA-wjm3-fq3r-5x46
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-36066 7.5

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

Record: UBUNTU-CVE-2020-36066
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVGO-2022-0957 No score

Denial of service via maliciously crafted JSON in github.com/tidwall/gjson

A maliciously crafted JSON input can cause a denial of service attack.

Record: GO-2022-0957
Updated: 2026-11-02

Affected products

gjson project gjson

Affected packages

Affected packages
Package	Affected	Fixed
`github.com/tidwall/gjson` Go	before 1.6.5	1.6.5
`golang-github-tidwall-gjson` Debian:12	before 1.6.7-1	1.6.7-1
`golang-github-tidwall-gjson` Debian:13	before 1.6.7-1	1.6.7-1
`golang-github-tidwall-gjson` Debian:14	before 1.6.7-1	1.6.7-1
`golang-github-tidwall-gjson` Ubuntu:20.04:LTS	All versions, plus listed versions 1.1.5-2	None known
`golang-github-tidwall-gjson` Ubuntu:22.04:LTS	All versions, plus listed versions 1.6.7-1	None known
`golang-github-tidwall-gjson` Ubuntu:24.04:LTS	All versions, plus listed versions 1.14.4-21.17.1-1	None known
`golang-github-tidwall-gjson` Ubuntu:25.10	All versions, plus listed versions 1.17.1-1	None known
`golang-github-tidwall-gjson` Ubuntu:26.10	All versions, plus listed versions 1.17.1-11.19.0-1	None known
`golang-github-tidwall-gjson` Ubuntu:26.04:LTS	All versions, plus listed versions 1.17.1-1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-36066 is a high vulnerability (CVSS 7.5) in Gjson Project Gjson, published January 5, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.84%, the 79th percentile. Fixed in github.com/tidwall/gjson 1.6.5.

References

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