# CVE-2026-8594: Text::LineFold versions through 2019.001 for Perl duplicate the output based on the number of special break characters

> Attackers can cause denial of service by triggering excessive resource consumption through duplicate output generation in the Text::LineFold Perl module.

- **Severity:** Medium 6.2 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** Yes
- **Published:** 30 May 2026
- **Updated:** 1 Jun 2026
- **Also known as:** AZL-89297, DEBIAN-CVE-2026-8594, GHSA-xfcf-wwr2-w555, MGASA-2026-0320, UBUNTU-CVE-2026-8594

## What is CVE-2026-8594?

CVE-2026-8594 is a medium-severity denial of service vulnerability in NEZUMI Text::LineFold, published on 30 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Text::LineFold versions through 2019.001 for Perl duplicate the output based on the number of special break characters.

Text::LineFold splits the input string by specific line break characters (such as VT, FF and others) into segments, but applies the break function to the entire string, not just the segment.

A side effect of this is that the full input can be duplicated for each segment.  Besides being incorrect, this can lead to unexpected resource consumption and possible denial of service.

Note that Text::LineFold is part of the Unicode-LineBreak distribution, which may have a higher version number than the module.

Weakness: CWE-407 (Inefficient Algorithmic Complexity), CWE-405 (Asymmetric Resource Consumption (Amplification))

## Which versions are affected by CVE-2026-8594?


## How do I fix CVE-2026-8594?

Apply the vendor's patch.

## Is CVE-2026-8594 being exploited?

There is no known exploitation of CVE-2026-8594 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8594 and fix it if it is affected.

What it is: CVE-2026-8594 is a medium-severity denial of service vulnerability in NEZUMI Text::LineFold, published on 30 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-8594 in the wild and no public exploit code.

Affected product: NEZUMI Text::LineFold. 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-2026-8594/ (Markdown: https://insights.sbomify.com/CVE-2026-8594/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8594
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8594
- OSV: https://osv.dev/vulnerability/CVE-2026-8594

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-8594/
Summaries are generated and may contain mistakes; the official description above is the record.