# CVE-2026-116267: libmime-tools-perl: MIME::Parser versions before 5.521 for Perl allow memory exhaustion via indented error messages from a truncated, dee...

CVE-2026-116267 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-116267, released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-116267
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 22, 2026

## Description

MIME::Parser versions before 5.521 for Perl allow memory exhaustion via indented error messages from a truncated, deeply nested message.  Each stored parser diagnostic is indented by three spaces per nesting level. When a message nested N levels deep ends without its closing boundaries, every level logs an error at its own depth, so the stored diagnostics grow with the square of N. The defaults place no limit on nesting depth.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmime-tools-perl Debian 14 | 5.522-1 | [DEBIAN-CVE-2026-116267](https://patchblox.com/security/data/fix/linux/debian-cve-2026-116267.md) | Nov 3, 2026 |
| Linux | perl-MIME-tools Fedora 43 | 5.522-1.fc43 | [FEDORA-2026-A415B3BF48](https://patchblox.com/security/data/fix/linux/fedora-2026-a415b3bf48.md) | Nov 7, 2026 |
| Linux | perl-MIME-tools opensuse-leap 16.0 | 5.522.0-bp160.1.1 | [OPENSUSE-SU-2026:22226-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22226-1.md) | Nov 7, 2026 |

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Data as of 2026-11-09T07:25:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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