# CVE-2025-29478: Denial of service in n/a

> A local attacker can cause a denial of service in Fluent Bit via a flaw in the cfl_list_size function.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Apr 2025
- **Updated:** 8 Apr 2025
- **Also known as:** AZL-59725, AZL-59733, BIT-fluent-bit-2025-29478, GHSA-57cc-74xg-cqvg

## What is CVE-2025-29478?

CVE-2025-29478 is a medium-severity denial of service vulnerability in n/a, published on 7 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An issue in fluent-bit v.3.7.2 allows a local attacker to cause a denial of service via the cfl_list_size in cfl_list.h:165.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2025-29478?

1 open source package ship an affected version, including fluent-bit. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `fluent-bit` | Bitnami | All versions | None |

Products: Treasuredata Fluent Bit.

## How do I fix CVE-2025-29478?

No fix has been published for CVE-2025-29478 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-29478 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-29478 exists.

## Other vulnerabilities in n/a

- [CVE-2024-4323](https://insights.sbomify.com/CVE-2024-4323/): Fluent Bit Memory Corruption Vulnerability (critical 9.8)
- [CVE-2021-36088](https://insights.sbomify.com/CVE-2021-36088/): Use after free in n/a (critical 9.8)
- [CVE-2025-12977](https://insights.sbomify.com/CVE-2025-12977/): CVE-2025-12977 (critical 9.1)
- [CVE-2025-12970](https://insights.sbomify.com/CVE-2025-12970/): CVE-2025-12970 (high 8.8)
- [CVE-2021-46878](https://insights.sbomify.com/CVE-2021-46878/): Use after free in n/a (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-29478 and fix it if it is affected.

What it is: CVE-2025-29478 is a medium-severity denial of service vulnerability in n/a, published on 7 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-29478 exists.

Affected packages and fixed versions:
- fluent-bit (Bitnami): affected all versions; no fix listed

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-2025-29478/ (Markdown: https://insights.sbomify.com/CVE-2025-29478/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-29478
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-29478
- OSV: https://osv.dev/vulnerability/CVE-2025-29478

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-29478/
Summaries are generated and may contain mistakes; the official description above is the record.