---
title: "CVE-2026-61815: zbateson/mail-mime-parser - CRLF Injection"
description: "zbateson/mail-mime-parser < 3.0.6 and < 4.0.2 contains a CRLF injection caused by unfiltered CR/LF characters in attachment filenames interpolated into MIME headers, letting attackers inject arbitrary headers, exploit requires attacker-controlled attachment filename."
url: https://panop.io/threat-heartbeat/CVE-2026-61815/
---

# CVE-2026-61815 zbateson/mail-mime-parser - CRLF Injection

zbateson/mail-mime-parser < 3.0.6 and < 4.0.2 contains a CRLF injection caused by unfiltered CR/LF characters in attachment filenames interpolated into MIME headers, letting attackers inject arbitrary headers, exploit requires attacker-controlled attachment filename.

CVSS base score 7.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-61815)

## Details

Type

CRLF Injection

Impact

Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Published

24 September 2026

Updated

15 October 2026

Weakness

[CWE-93](https://cwe.mitre.org/data/definitions/93.html)

## Vendor fix

Upgrade to versions 3.0.6 or 4.0.2 or later; alternatively, sanitize filenames to remove CR/LF characters before use.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-61815](https://nvd.nist.gov/vuln/detail/CVE-2026-61815)
- [https://github.com/zbateson/mail-mime-parser/security/advisories/GHSA-36h5-qg4p-q2qf](https://github.com/zbateson/mail-mime-parser/security/advisories/GHSA-36h5-qg4p-q2qf)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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