How severe is CVE-2026-50560?

CVE-2026-50560 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 none, and availability low.

Is CVE-2026-50560 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-2026-50560?

CVE-2026-50560 affects Netty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-50560?

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

Does CVE-2026-50560 have an EU (EUVD) identifier?

Yes. CVE-2026-50560 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36471.

When was CVE-2026-50560 published?

CVE-2026-50560 was published on 2026-06-12 and last updated on 2026-06-17.

CVE-2026-50560

CVE-2026-50560 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36471
Weakness: CWE-770
Affected product: Netty
Published: 2026-06-12
Last modified: 2026-06-17

Description

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called `SETTINGS_MAX_HEADER_LIST_SIZE`. When a client sends that setting to Netty, it appears that Netty will behave as follows: read the request; proxy the request to the origin; attempt to produce a response; and create an exception while writing the headers for the response. Functionally, this should be similar to the http2 reset attack, but with a different on-the-wire signature. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Frequently asked questions

What is CVE-2026-50560?: Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called `SETTINGS_MAX_HEADER_LIST_SIZE`. When a client sends that setting to Netty, it appears that Netty will behave as follows: read the request; proxy the request to the origin; attempt to produce a response; and create an exception while writing the headers for the response. Functionally, this should be similar to the http2 reset attack, but with a different on-the-wire signature. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
How severe is CVE-2026-50560?: CVE-2026-50560 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 none, and availability low.
Is CVE-2026-50560 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-2026-50560?: CVE-2026-50560 affects Netty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-50560?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-50560 have an EU (EUVD) identifier?: Yes. CVE-2026-50560 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36471.
When was CVE-2026-50560 published?: CVE-2026-50560 was published on 2026-06-12 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Netty

CVE-2019-20445 — Critical (CVSS 9.1): HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second…
CVE-2019-20444 — Critical (CVSS 9.1): HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a…
CVE-2026-47691 — High (CVSS 8.7): Netty is a network application framework for development of protocol servers and clients. Prior to versions…
CVE-2026-45674 — High (CVSS 8.7): Netty is a network application framework for development of protocol servers and clients. Prior to versions…
CVE-2026-44249 — High (CVSS 8.1): Netty is a network application framework for development of protocol servers and clients. In netty-handler prior to…
CVE-2026-50011 — High (CVSS 7.5): Netty is a network application framework for development of protocol servers and clients. Prior to versions…

All CVEs affecting Netty →

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities

CVE-2026-31283 — Critical (CVSS 9.8): In Totara LMS v19.1.5 and before, the forgot password API does not implement rate limiting for the target email…
CVE-2020-37067 — Critical (CVSS 9.8): Filetto 1.0 FTP server contains a denial of service vulnerability in the FEAT command processing that allows attackers…
CVE-2021-47875 — Critical (CVSS 9.8): GeoGebra CAS Calculator 6.0.631.0 contains a denial of service vulnerability that allows attackers to crash the…
CVE-2025-11832 — Critical (CVSS 9.8): Allocation of Resources Without Limits or Throttling vulnerability in Azure Access Technology BLU-IC2, Azure Access…
CVE-2024-44241 — Critical (CVSS 9.8): The issue was addressed with improved bounds checks. This issue is fixed in iOS 18.1 and iPadOS 18.1, macOS Sequoia…
CVE-2022-3439 — Critical (CVSS 9.8): Allocation of Resources Without Limits or Throttling in GitHub repository ikus060/rdiffweb prior to 2.5.0.

Browse all CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities →