# CVE-2024-39702: Denial of service in n/a

> An attacker can cause denial of service in OpenResty by sending crafted requests that trigger excessive resource usage in the string hashing function.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/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:** No
- **Published:** 23 Jul 2024
- **Updated:** 26 Nov 2024
- **Also known as:** GHSA-6px8-752j-c2vv

## What is CVE-2024-39702?

CVE-2024-39702 is a medium-severity denial of service vulnerability in n/a, published on 23 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In lj_str_hash.c in OpenResty 1.19.3.1 through 1.25.3.1, the string hashing function (used during string interning) allows HashDoS (Hash Denial of Service) attacks. An attacker could cause excessive resource usage during proxy operations via crafted requests, potentially leading to a denial of service with relatively few incoming requests. This vulnerability only exists in the OpenResty fork in the openresty/luajit2 GitHub repository. The LuaJIT/LuaJIT repository. is unaffected.

Weakness: CWE-407 (Inefficient Algorithmic Complexity)

## Which versions are affected by CVE-2024-39702?

It affects 1 product.


Products: Openresty Openresty.

## How do I fix CVE-2024-39702?

No fix has been published for CVE-2024-39702 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-39702 being exploited?

There is no known exploitation of CVE-2024-39702 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2018-9230](https://insights.sbomify.com/CVE-2018-9230/): Security feature bypass in n/a (critical 9.8)
- [CVE-2026-55233](https://insights.sbomify.com/CVE-2026-55233/): OpenResty: Buffer overflow when writing PROXY protocol v2 header to upstream (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-39702 and fix it if it is affected.

What it is: CVE-2024-39702 is a medium-severity denial of service vulnerability in n/a, published on 23 Jul 2024. 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-2024-39702 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2024-39702/ (Markdown: https://insights.sbomify.com/CVE-2024-39702/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-39702
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-39702
- OSV: https://osv.dev/vulnerability/CVE-2024-39702

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-39702/
Summaries are generated and may contain mistakes; the official description above is the record.