# CVE-2020-35380: Denial of service in GJSON

> Attackers can cause a denial of service in applications using the GJSON library by submitting crafted JSON input.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 15 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-35380, GHSA-w942-gw6m-p62c, GO-2021-0059, UBUNTU-CVE-2020-35380

## What is CVE-2020-35380?

CVE-2020-35380 is a high-severity denial of service vulnerability in n/a, published on 15 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

GJSON before 1.6.4 allows attackers to cause a denial of service via crafted JSON.

## Which versions are affected by CVE-2020-35380?

3 open source packages ship an affected version, including github.com/tidwall/gjson. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/tidwall/gjson` | Go | All versions | 1.6.4 |
| `github.com/tidwall/gjson` | Go | All versions | 1.6.4 |
| `github.com/tidwall/gjson` | Go | All versions | 1.6.4 |

Products: Gjson Project Gjson.

## How do I fix CVE-2020-35380?

Upgrade github.com/tidwall/gjson to 1.6.4 or later.

## Is CVE-2020-35380 being exploited?

There is no known exploitation of CVE-2020-35380 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-42836](https://insights.sbomify.com/CVE-2021-42836/): Duplicate Advisory: ReDoS via crafted JSON input in GJSON (high 7.5)
- [CVE-2020-36066](https://insights.sbomify.com/CVE-2020-36066/): github.com/tidwall/gjson is vulnerable to Denial of service (high 7.5)
- [CVE-2020-36067](https://insights.sbomify.com/CVE-2020-36067/): Improper Validation of Array Index in GJSON (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35380 and fix it if it is affected.

What it is: CVE-2020-35380 is a high-severity denial of service vulnerability in n/a, published on 15 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-35380 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/tidwall/gjson (Go): affected all versions; fixed in 1.6.4
- github.com/tidwall/gjson (Go): affected all versions; fixed in 1.6.4
- github.com/tidwall/gjson (Go): affected all versions; fixed in 1.6.4

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-35380/ (Markdown: https://insights.sbomify.com/CVE-2020-35380/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35380
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35380
- OSV: https://osv.dev/vulnerability/CVE-2020-35380

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35380/
Summaries are generated and may contain mistakes; the official description above is the record.