# CVE-2011-2631: Denial of service in n/a

> Remote attackers can cause a denial of service in Opera browser via a malicious web page triggering an infinite repaint loop.

- **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:** A user has to click or open something
- **Fix available:** No
- **Published:** 1 Jul 2011
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-3hr4-2x74-c996

## What is CVE-2011-2631?

CVE-2011-2631 is a medium-severity denial of service vulnerability in Opera Opera Browser, published on 1 Jul 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The Cascading Style Sheets (CSS) implementation in Opera before 11.11 does not properly handle the column-count property, which allows remote attackers to cause a denial of service (infinite repaint loop and application hang) via a web page, as demonstrated by an unspecified Wikipedia page.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2011-2631?

It affects 1 product.


Products: Opera Opera Browser.

## How do I fix CVE-2011-2631?

No fix has been published for CVE-2011-2631 yet. Limit exposure of the affected software until one is available.

## Is CVE-2011-2631 being exploited?

There is no known exploitation of CVE-2011-2631 in the wild and no public exploit code.

## Other vulnerabilities in Opera Opera Browser

- [CVE-2013-3211](https://insights.sbomify.com/CVE-2013-3211/): Unspecified vulnerability in Opera before 12.15 has unknown impact and attack vectors, related to a "moderately severe issue." (critical 10.0)
- [CVE-2012-4145](https://insights.sbomify.com/CVE-2012-4145/): Other in n/a (critical 10.0)
- [CVE-2012-3559](https://insights.sbomify.com/CVE-2012-3559/): Other in n/a (critical 10.0)
- [CVE-2012-3561](https://insights.sbomify.com/CVE-2012-3561/): Memory corruption in n/a (critical 10.0)
- [CVE-2011-4683](https://insights.sbomify.com/CVE-2011-4683/): Unspecified vulnerability in Opera before 11.60 has unknown impact and attack vectors, related to a "moderately severe issue." (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-2631 and fix it if it is affected.

What it is: CVE-2011-2631 is a medium-severity denial of service vulnerability in Opera Opera Browser, published on 1 Jul 2011. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2011-2631 in the wild and no public exploit code.

Affected product: Opera Opera Browser. 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-2011-2631/ (Markdown: https://insights.sbomify.com/CVE-2011-2631/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-2631
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-2631
- OSV: https://osv.dev/vulnerability/CVE-2011-2631

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From sbomify Insights: https://insights.sbomify.com/CVE-2011-2631/
Summaries are generated and may contain mistakes; the official description above is the record.