CRLF Injection Affecting nginx package, versions [0.6.27,1.28.3)[1.29.0,1.29.7)
Threat Intelligence
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-UNMANAGED-NGINX-15808031
- published29 Mar 2026
- disclosed24 Mar 2026
- creditAsim Viladi Oglu Manizada, Colin Warren, Xiao Liu, Yuan Tan, Bird Liu
Introduced: 24 Mar 2026
CVE-2026-28753 (opens in a new tab)How to fix?
Upgrade nginx to version 1.28.3, 1.29.7 or higher.
Overview
Affected versions of this package are vulnerable to CRLF Injection in the ngx_mail_smtp_module process. An attacker can manipulate SMTP upstream requests by injecting arbitrary headers through specially crafted DNS responses containing Carriage Return (CRLF) sequences.