# CVE-2025-2833: zhangyd-c OneBlog HTTP Header redos

> Remote attackers can cause denial of service in OneBlog by sending crafted X-Forwarded-For headers that trigger inefficient regular expression processing.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Mar 2025
- **Updated:** 27 Mar 2025
- **Also known as:** GHSA-5jpq-rg6x-9vcr

## What is CVE-2025-2833?

CVE-2025-2833 is a medium-severity denial of service vulnerability in zhangyd-c OneBlog, published on 27 Mar 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in zhangyd-c OneBlog up to 2.3.9. It has been classified as problematic. Affected is an unknown function of the component HTTP Header Handler. The manipulation of the argument X-Forwarded-For leads to inefficient regular expression complexity. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-400 (Uncontrolled Resource Consumption), CWE-1333 (Inefficient Regular Expression Complexity)

## Which versions are affected by CVE-2025-2833?

It affects 1 product.


Products: Zhyd Oneblog.

## How do I fix CVE-2025-2833?

No fix has been published for CVE-2025-2833 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-2833 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-2833 exists.

## Other vulnerabilities in zhangyd-c OneBlog

- [CVE-2025-60355](https://insights.sbomify.com/CVE-2025-60355/): Code injection in n/a (critical 9.8)
- [CVE-2024-54954](https://insights.sbomify.com/CVE-2024-54954/): Code injection in n/a (high 8.0)
- [CVE-2025-56264](https://insights.sbomify.com/CVE-2025-56264/): Denial of service in n/a (high 7.5)
- [CVE-2022-34012](https://insights.sbomify.com/CVE-2022-34012/): Privilege escalation in n/a (medium 6.5)
- [CVE-2024-29469](https://insights.sbomify.com/CVE-2024-29469/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-2833 and fix it if it is affected.

What it is: CVE-2025-2833 is a medium-severity denial of service vulnerability in zhangyd-c OneBlog, published on 27 Mar 2025. 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-2025-2833 exists.

Affected product: zhangyd-c OneBlog. 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-2025-2833/ (Markdown: https://insights.sbomify.com/CVE-2025-2833/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-2833
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-2833
- OSV: https://osv.dev/vulnerability/CVE-2025-2833

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-2833/
Summaries are generated and may contain mistakes; the official description above is the record.