# CVE-2022-25309: Memory corruption in fribidi

> A heap-based buffer overflow in Fribidi allows attackers to cause a denial of service via a crafted file processed with the --caprtl option.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 6 Sep 2022
- **Updated:** 3 Aug 2024
- **Also known as:** ALPINE-CVE-2022-25309, AZL-10887, DEBIAN-CVE-2022-25309, GHSA-4fjx-j6jj-8pm5, JLSEC-2025-171, ROOT-OS-ALPINE-315-CVE-2022-25309, UBUNTU-CVE-2022-25309

## What is CVE-2022-25309?

CVE-2022-25309 is a medium-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 6 Sep 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A heap-based buffer overflow flaw was found in the Fribidi package and affects the fribidi_cap_rtl_to_unicode() function of the fribidi-char-sets-cap-rtl.c file. This flaw allows an attacker to pass a specially crafted file to the Fribidi application with the '--caprtl' option, leading to a crash and causing a denial of service.

Weakness: CWE-787 (Out-of-bounds Write), CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2022-25309?

It affects 2 products.


Products: Gnu Fribidi, Redhat Enterprise Linux.

## How do I fix CVE-2022-25309?

Apply the vendor's patch.

## Is CVE-2022-25309 being exploited?

There is no known exploitation of CVE-2022-25309 in the wild and no public exploit code.

## Other vulnerabilities in Redhat Enterprise Linux

- [CVE-2022-25308](https://insights.sbomify.com/CVE-2022-25308/): Memory corruption in fribidi (high 7.8)
- [CVE-2022-25310](https://insights.sbomify.com/CVE-2022-25310/): Null dereference in fribidi (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-25309 and fix it if it is affected.

What it is: CVE-2022-25309 is a medium-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 6 Sep 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2022-25309 in the wild and no public exploit code.

Affected product: Redhat Enterprise 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-2022-25309/ (Markdown: https://insights.sbomify.com/CVE-2022-25309/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-25309
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-25309
- OSV: https://osv.dev/vulnerability/CVE-2022-25309

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-25309/
Summaries are generated and may contain mistakes; the official description above is the record.