# CVE-2024-28867: Swift Prometheus un-sanitized metric name or labels can be used to take over exported metrics

> Attackers can inject malicious characters into metric names or labels to corrupt exported metrics and cause memory exhaustion in Swift Prometheus clients.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 29 Mar 2024
- **Updated:** 25 Mar 2025
- **Also known as:** GHSA-x768-cvr2-345r

## What is CVE-2024-28867?

CVE-2024-28867 is a medium-severity vulnerability in swift-server swift-prometheus, published on 29 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Swift Prometheus is a Swift client for the Prometheus monitoring system, supporting counters, gauges and histograms. In code which applies _un-sanitized string values into metric names or labels_, an attacker could make use of this and send a `?lang` query parameter containing newlines, `}`  or similar characters which can lead to the attacker taking over the exported format -- including creating unbounded numbers of stored metrics, inflating server memory usage, or causing "bogus" metrics. This vulnerability is fixed in2.0.0-alpha.2.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2024-28867?

2 open source packages ship an affected version, including github.com/swift-server/swift-prometheus. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/swift-server/swift-prometheus` | SwiftURL | From 2.0.0-alpha.1 | 2.0.0-alpha.2 |
| `github.com/swift-server/swift-prometheus` | SwiftURL | From 2.0.0-alpha.1 | 2.0.0-alpha.2 |

Products: Apple Swift Prometheus.

## How do I fix CVE-2024-28867?

Upgrade github.com/swift-server/swift-prometheus to 2.0.0-alpha.2 or later.

## Is CVE-2024-28867 being exploited?

There is no known exploitation of CVE-2024-28867 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-28867 and fix it if it is affected.

What it is: CVE-2024-28867 is a medium-severity vulnerability in swift-server swift-prometheus, published on 29 Mar 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-2024-28867 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/swift-server/swift-prometheus (SwiftURL): affected from 2.0.0-alpha.1; fixed in 2.0.0-alpha.2
- github.com/swift-server/swift-prometheus (SwiftURL): affected from 2.0.0-alpha.1; fixed in 2.0.0-alpha.2

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-2024-28867/ (Markdown: https://insights.sbomify.com/CVE-2024-28867/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-28867
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-28867
- OSV: https://osv.dev/vulnerability/CVE-2024-28867

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-28867/
Summaries are generated and may contain mistakes; the official description above is the record.