How severe is CVE-2026-41417?

CVE-2026-41417 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-41417 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41417?

CVE-2026-41417 affects Netty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41417?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-41417 have an EU (EUVD) identifier?

Yes. CVE-2026-41417 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28224.

When was CVE-2026-41417 published?

CVE-2026-41417 was published on 2026-05-06 and last updated on 2026-06-17.

CVE-2026-41417

CVE-2026-41417 is a medium-severity vulnerability in Netty with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-93.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28224
Weakness: CWE-93
Affected product: Netty
Published: 2026-05-06
Last modified: 2026-06-17

Description

Netty allows request-line validation to be bypassed when a `DefaultHttpRequest` or `DefaultFullHttpRequest` is created first and its URI is later changed via `setUri()`. The constructors reject CRLF and whitespace characters that would break the start-line, but `setUri()` does not apply the same validation. `HttpRequestEncoder` and `RtspEncoder` then write the URI into the request line verbatim. If attacker-controlled input reaches `setUri()`, 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.

Frequently asked questions

What is CVE-2026-41417?: Netty allows request-line validation to be bypassed when a `DefaultHttpRequest` or `DefaultFullHttpRequest` is created first and its URI is later changed via `setUri()`. The constructors reject CRLF and whitespace characters that would break the start-line, but `setUri()` does not apply the same validation. `HttpRequestEncoder` and `RtspEncoder` then write the URI into the request line verbatim. If attacker-controlled input reaches `setUri()`, 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.
How severe is CVE-2026-41417?: CVE-2026-41417 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-41417 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41417?: CVE-2026-41417 affects Netty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41417?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-41417 have an EU (EUVD) identifier?: Yes. CVE-2026-41417 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28224.
When was CVE-2026-41417 published?: CVE-2026-41417 was published on 2026-05-06 and last updated on 2026-06-17.

References

https://github.com/netty/netty/security/advisories/GHSA-v8h7-rr48-vmmv

Affected products (1)

cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*

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