# CVE-2026-13401: libxml-bare-perl: XML::Bare versions through 0.53 for Perl will hang in an infinite loop when parsing malformed attributes

CVE-2026-13401 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-13401, released July 19, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-13401
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0061
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 16, 2026

## Description

XML::Bare versions through 0.53 for Perl will hang in an infinite loop when parsing malformed attributes.  The parserc_parse function never advances the attribute-parse state cursor on certain malformed attribute forms, looping forever.  Nameless attributes such as "<a ='c'>" or unbalanced quotes "<a b='''''''c'>" can trigger this condition.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libxml-bare-perl Debian 14 | 0.53-5 | [DEBIAN-CVE-2026-13401](https://patchblox.com/security/data/fix/linux/debian-cve-2026-13401.md) | Jul 19, 2026 |
| Linux | perl-XML-Bare Fedora 43 | 0.53-44.fc43 | [FEDORA-2026-14E358A2A2](https://patchblox.com/security/data/fix/linux/fedora-2026-14e358a2a2.md) | Aug 30, 2026 |
| Linux | perl-XML-Bare opensuse-leap 16.0 | 0.53-bp160.2.1 | [OPENSUSE-SU-2026:21435-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21435-1.md) | Jul 22, 2026 |
| Linux | perl-XML-Bare sles 15.7 | 0.53-150000.3.3.1 | [SUSE-SU-2026:3403-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3403-1.md) | Jul 29, 2026 |
| Linux | perl-XML-Bare-debuginfo Fedora 43 | 0.53-44.fc43 | [FEDORA-2026-14E358A2A2](https://patchblox.com/security/data/fix/linux/fedora-2026-14e358a2a2.md) | Aug 30, 2026 |
| Linux | perl-XML-Bare-debugsource Fedora 43 | 0.53-44.fc43 | [FEDORA-2026-14E358A2A2](https://patchblox.com/security/data/fix/linux/fedora-2026-14e358a2a2.md) | Aug 30, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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