# CVE-2010-1866: Integer overflow in n/a

> Attackers can cause a crash or potential code execution in PHP via a negative chunk size in HTTP chunked encoding streams.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 7 May 2010
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-cwwq-64rr-rv47

## What is CVE-2010-1866?

CVE-2010-1866 is a critical vulnerability in Opensuse Opensuse, published on 7 May 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The dechunk filter in PHP 5.3 through 5.3.2, when decoding an HTTP chunked encoding stream, allows context-dependent attackers to cause a denial of service (crash) and possibly trigger memory corruption via a negative chunk size, which bypasses a signed comparison, related to an integer overflow in the chunk size decoder.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2010-1866?

It affects 3 products.


Products: Opensuse Opensuse, Php Php, Suse Linux Enterprise.

## How do I fix CVE-2010-1866?

No fix has been published for CVE-2010-1866 yet. Limit exposure of the affected software until one is available.

## Is CVE-2010-1866 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-1866 exists.

Public exploit code:

- PHP 5.3 - 'PHP_dechunk()' HTTP Chunked Encoding Integer Overflow (exploitdb)

## Other vulnerabilities in Opensuse Opensuse

- [CVE-2015-5957](https://insights.sbomify.com/CVE-2015-5957/): Memory corruption in n/a (critical 10.0)
- [CVE-2015-0491](https://insights.sbomify.com/CVE-2015-0491/): Memory corruption in n/a (critical 10.0)
- [CVE-2008-2388](https://insights.sbomify.com/CVE-2008-2388/): Integer overflow in n/a (critical 10.0)
- [CVE-2015-0492](https://insights.sbomify.com/CVE-2015-0492/): Other in n/a (critical 9.3)
- [CVE-2014-0158](https://insights.sbomify.com/CVE-2014-0158/): Memory corruption in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2010-1866 and fix it if it is affected.

What it is: CVE-2010-1866 is a critical vulnerability in Opensuse Opensuse, published on 7 May 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-1866 exists.

Affected product: Opensuse Opensuse. 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-2010-1866/ (Markdown: https://insights.sbomify.com/CVE-2010-1866/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2010-1866
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-1866
- OSV: https://osv.dev/vulnerability/CVE-2010-1866

---
From sbomify Insights: https://insights.sbomify.com/CVE-2010-1866/
Summaries are generated and may contain mistakes; the official description above is the record.