CRLF Injection Affecting io.netty:netty-codec-smtp package, versions [,4.1.128.Final)[4.2.0.Alpha1,4.2.7.Final)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-IONETTY-13560334
- published16 Oct 2025
- disclosed15 Oct 2025
- creditDepthFirst Disclosures
Introduced: 15 Oct 2025
NewCVE-2025-59419 (opens in a new tab)How to fix?
Upgrade io.netty:netty-codec-smtp to version 4.1.128.Final, 4.2.7.Final or higher.
Overview
Affected versions of this package are vulnerable to CRLF Injection via insufficient input validation in the DefaultSmtpRequest process. An attacker can inject arbitrary SMTP commands by supplying malicious parameters containing CRLF sequences, allowing the sending of forged emails that appear to originate from a trusted server.