# CVE-2024-21742: apache-mime4j: Improper input validation allows for header injection in MIME4J library when using MIME4J DOM for composing message

CVE-2024-21742 is fixed in apache-mime4j on 1 platform, first by DEBIAN-CVE-2024-21742, released February 27, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-21742
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0109
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 27, 2024

## Description

Improper input validation allows for header injection in MIME4J library when using MIME4J DOM for composing message. This can be exploited by an attacker to add unintended headers to MIME messages.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | apache-mime4j Debian 13.5 (trixie) | 0.8.10-1 | [DEBIAN-CVE-2024-21742](https://patchblox.com/security/data/fix/linux/debian-cve-2024-21742.md) | Feb 27, 2024 |
| Linux | apache-mime4j Debian 14 | 0.8.10-1 | [DEBIAN-CVE-2024-21742](https://patchblox.com/security/data/fix/linux/debian-cve-2024-21742.md) | Feb 27, 2024 |

---

Data as of 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.