# CVE-2012-2739: Denial of service in n/a

> Attackers can cause denial of service via CPU exhaustion by triggering predictable hash collisions in Java hash tables.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Nov 2012
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-g4rj-4w28-44fg

## What is CVE-2012-2739?

CVE-2012-2739 is a medium-severity denial of service vulnerability in Oracle Jdk, published on 28 Nov 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Oracle Java SE before 7 Update 6, and OpenJDK 7 before 7u6 build 12 and 8 before build 39, computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.

Weakness: CWE-310

## Which versions are affected by CVE-2012-2739?

It affects 3 products.


Products: Oracle Jdk, Oracle Jre, Oracle Openjdk.

## How do I fix CVE-2012-2739?

No fix has been published for CVE-2012-2739 yet. Limit exposure of the affected software until one is available.

## Is CVE-2012-2739 being exploited?

There is no known exploitation of CVE-2012-2739 in the wild and no public exploit code.

## Other vulnerabilities in Oracle Jdk

- [CVE-2012-4681](https://insights.sbomify.com/CVE-2012-4681/): Oracle Java SE Runtime Environment (JRE) Arbitrary Code Execution (critical 9.8, exploited in the wild)
- [CVE-2012-1723](https://insights.sbomify.com/CVE-2012-1723/): Oracle Java SE Runtime Environment (JRE) Arbitrary Code Execution (critical 9.8, exploited in the wild)
- [CVE-2015-4805](https://insights.sbomify.com/CVE-2015-4805/): Deserialization in n/a (critical 10.0)
- [CVE-2015-4835](https://insights.sbomify.com/CVE-2015-4835/): Other in n/a (critical 10.0)
- [CVE-2015-4843](https://insights.sbomify.com/CVE-2015-4843/): Other in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2012-2739 and fix it if it is affected.

What it is: CVE-2012-2739 is a medium-severity denial of service vulnerability in Oracle Jdk, published on 28 Nov 2012. 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-2012-2739 in the wild and no public exploit code.

Affected product: Oracle Jdk. 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-2012-2739/ (Markdown: https://insights.sbomify.com/CVE-2012-2739/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2012-2739
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2012-2739
- OSV: https://osv.dev/vulnerability/CVE-2012-2739

---
From sbomify Insights: https://insights.sbomify.com/CVE-2012-2739/
Summaries are generated and may contain mistakes; the official description above is the record.