# CVE-2025-7208: 9fans plan9port x509.c edump heap-based overflow

> A heap-based buffer overflow in the x509.c library allows attackers to execute arbitrary code or cause denial of service.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **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:** 9 Jul 2025
- **Updated:** 9 Jul 2025
- **Also known as:** GHSA-2ff5-v85j-347q

## What is CVE-2025-7208?

CVE-2025-7208 is a medium-severity memory corruption vulnerability in 9fans plan9port, published on 9 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability was found in 9fans plan9port up to 9da5b44. It has been classified as critical. This affects the function edump in the library /src/plan9port/src/libsec/port/x509.c. The manipulation leads to heap-based buffer overflow. The exploit has been disclosed to the public and may be used. This product takes the approach of rolling releases to provide continious delivery. Therefore, version details for affected and updated releases are not available. The identifier of the patch is b3e06559475b0130a7a2fb56ac4d131d13d2012f. It is recommended to apply a patch to fix this issue.

Weakness: CWE-122 (Heap-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-7208?

It affects 1 product.


Products: 9fans Plan9port.

## How do I fix CVE-2025-7208?

No fix has been published for CVE-2025-7208 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-7208 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-7208 exists.

## Other vulnerabilities in 9fans plan9port

- [CVE-2025-7209](https://insights.sbomify.com/CVE-2025-7209/): 9fans plan9port x509.c value_decode null pointer dereference (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-7208 and fix it if it is affected.

What it is: CVE-2025-7208 is a medium-severity memory corruption vulnerability in 9fans plan9port, published on 9 Jul 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-2025-7208 exists.

Affected product: 9fans plan9port. 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-2025-7208/ (Markdown: https://insights.sbomify.com/CVE-2025-7208/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-7208
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-7208
- OSV: https://osv.dev/vulnerability/CVE-2025-7208

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-7208/
Summaries are generated and may contain mistakes; the official description above is the record.