# CVE-2022-31081: Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in HTTP::Daemon

> HTTP request smuggling in HTTP::Daemon allows attackers to poison caches or access privileged APIs, primarily affecting local development environments.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 Jun 2022
- **Updated:** 22 Apr 2025
- **Also known as:** BELL-CVE-2022-31081, DEBIAN-CVE-2022-31081, DLA-3127-1, GHSA-cg8c-pxmv-w7cf, MGASA-2022-0349, SUSE-SU-2022:2872-1, SUSE-SU-2022:2874-1, UBUNTU-CVE-2022-31081, USN-5520-1, USN-5520-2, openSUSE-SU-2024:12216-1

## What is CVE-2022-31081?

CVE-2022-31081 is a high-severity vulnerability in Debian Debian Linux, published on 27 Jun 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

HTTP::Daemon is a simple http server class written in perl. Versions prior to 6.15 are subject to a vulnerability which could potentially be exploited to gain privileged access to APIs or poison intermediate caches. It is uncertain how large the risks are, most Perl based applications are served on top of Nginx or Apache, not on the `HTTP::Daemon`. This library is commonly used for local development and tests. Users are advised to update to resolve this issue. Users unable to upgrade may add additional request handling logic as a mitigation. After calling `my $rqst = $conn->get_request()` one could inspect the returned `HTTP::Request` object. Querying the 'Content-Length' (`my $cl = $rqst->header('Content-Length')`) will show any abnormalities that should be dealt with by a `400` response. Expected strings of 'Content-Length' SHOULD consist of either a single non-negative integer, or, a comma separated repetition of that number. (that is `42` or `42, 42, 42`). Anything else MUST be rejected.

Weakness: CWE-444 (Inconsistent Interpretation of HTTP Requests)

## Which versions are affected by CVE-2022-31081?

It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `perl-HTTP-Daemon` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 6.01-150000.3.5.1 |
| `perl-HTTP-Daemon` | SUSE:Linux Enterprise Module for Basesystem 15 SP4 | All versions | 6.01-150000.3.5.1 |
| `perl-HTTP-Daemon` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 6.01-9.5.1 |
| `perl-HTTP-Daemon` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 6.01-9.5.1 |
| `perl-HTTP-Daemon` | openSUSE:Leap 15.3 | All versions | 6.01-150000.3.5.1 |
| `perl-HTTP-Daemon` | openSUSE:Leap 15.4 | All versions | 6.01-150000.3.5.1 |
| `perl-HTTP-Daemon` | openSUSE:Tumbleweed | All versions | 6.14-2.1 |

Products: Debian Debian Linux, Http\ \.

## How do I fix CVE-2022-31081?

Upgrade to a fixed version.

## Is CVE-2022-31081 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-31081 exists.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-31081 and fix it if it is affected.

What it is: CVE-2022-31081 is a high-severity vulnerability in Debian Debian Linux, published on 27 Jun 2022. 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-2022-31081 exists.

Affected product: Debian Debian Linux. 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-2022-31081/ (Markdown: https://insights.sbomify.com/CVE-2022-31081/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-31081
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-31081
- OSV: https://osv.dev/vulnerability/CVE-2022-31081

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-31081/
Summaries are generated and may contain mistakes; the official description above is the record.