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

CVE-2026-8594 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-8594, released May 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-8594
- Priority: Routine
- CVSS: 6.2 (medium)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 30, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libunicode-linebreak-perl Debian 14 | 0.0.20190101-4 | [DEBIAN-CVE-2026-8594](https://patchblox.com/security/data/fix/linux/debian-cve-2026-8594.md) | May 30, 2026 |
| Linux | perl-Unicode-LineBreak amzn 2023 | 2019.001-9.amzn2023.0.4 | [ALAS2023-2026-1831](https://patchblox.com/security/data/fix/linux/alas2023-2026-1831.md) | Jun 11, 2026 |
| Linux | perl-Unicode-LineBreak-debuginfo amzn 2023 | 2019.001-9.amzn2023.0.4 | [ALAS2023-2026-1831](https://patchblox.com/security/data/fix/linux/alas2023-2026-1831.md) | Jun 11, 2026 |
| Linux | perl-Unicode-LineBreak-debugsource amzn 2023 | 2019.001-9.amzn2023.0.4 | [ALAS2023-2026-1831](https://patchblox.com/security/data/fix/linux/alas2023-2026-1831.md) | Jun 11, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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