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Vulnerabilities

Vulnerability · CVE-2026-41417

Netty allows request-line validation to be bypassed when a or is created first and its URI is later changed via .

Published May 6, 2026 · catalog updated Jun 17, 2026 · Netty allows request-line validation

Check if you run it

No confirmed exploitation is on record for CVE-2026-41417. EPSS is 0.34%. Act only if a listed version of Netty allows request-line validation is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Netty allows request-line validation).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.34%
Remediation
Advisory link
Affected products
cpe netty/netty

Netty allows request-line validation to be bypassed when a or is created first and its URI is later changed via . The constructors reject CRLF and whitespace characters that would break the start-line, but does not apply the same validation. and then write the URI into the request line verbatim. If attacker-controlled input reaches , this enables CRLF injection and insertion of additional HTTP or RTSP requests, leading to HTTP request smuggling or desynchronization on the HTTP side and request injection on the RTSP side. This issue is fixed in versions 4.2.13.Final and 4.1.133.Final.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe netty/nettyversion unspecified

How to fix CVE-2026-41417

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-41417. EPSS is 0.34%. Act only if a listed version of Netty allows request-line validation is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-444: HTTP Request Smuggling; CWE-93. EPSS 0.34%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 6, 2026 · NIST NVD

    Detected

    Netty allows request-line validation to be bypassed when a or is created first and its URI is later changed via . The constructors reject CRLF and whitespace characters that would break the start-line, but does not apply the same validation. and then write the URI into the request line verbatim. If attacker-controlled input reaches , this enables CRLF injection and insertion of additional HTTP or

  2. Jun 17, 2026 · NIST NVD

    Updated

    Netty allows request-line validation to be bypassed when a or is created first and its URI is later changed via . The constructors reject CRLF and whitespace characters that would break the start-line, but does not apply the same validation. and then write the URI into the request line verbatim. If attacker-controlled input reaches , this enables CRLF injection and insertion of additional HTTP or

Sources

  • CVE.orgVulnerability recordCVE-2026-41417

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-41417

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-41417

    Netty allows request-line validation to be bypassed when a or is created first and its URI is later changed via . The constructors reject CRLF and whitespace characters that would break the start-line, but does no

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.