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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-42584

38
FAUCET Score

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 4.1.133CPE matchmatch criteria
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
>= 4.2.0, < 4.2.13CPE matchmatch criteria
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.75%
Probability of exploitation in next 30 days
EPSS Percentile
51.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0075 is in the 34th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (10)

mavenpatch availablevia ghsa
Product: io.netty:netty-codec-httpFixed in: 4.2.13.Final
mavenpatch availablevia ghsa
Product: io.netty:netty-codec-httpFixed in: 4.1.133.Final
ubuntupatch availablevia ubuntu_usn
Product: netty (bionic)Fixed in: 1:4.1.7-4ubuntu0.1+esm6
ubuntupatch availablevia ubuntu_usn
Product: netty (focal)Fixed in: 1:4.1.45-1ubuntu0.1~esm6
ubuntupatch availablevia ubuntu_usn
Product: netty (jammy)Fixed in: 1:4.1.48-4+deb11u2ubuntu0.1+esm3
ubuntupatch availablevia ubuntu_usn
Product: netty (noble)Fixed in: 1:4.1.48-9ubuntu0.1+esm3
ubuntupatch availablevia ubuntu_usn
Product: netty (resolute)Fixed in: 1:4.1.48-16ubuntu0.1~esm2
ubuntupatch availablevia ubuntu_usn
Product: netty (trusty)Fixed in: 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: netty (xenial)Fixed in: 1:4.0.34-1ubuntu0.1~esm4
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (2)

ubuntuUSN-8401-1

Netty vulnerabilities

Jun 8, 2026
mavenGHSA-57rv-r2g8-2cj3high

Netty has HttpClientCodec response desynchronization

May 7, 2026

References

access.redhat.com / errata/RHSA-2026:23808
access.redhat.com / errata/RHSA-2026:24502
access.redhat.com / errata/RHSA-2026:25123
access.redhat.com / errata/RHSA-2026:28010
access.redhat.com / errata/RHSA-2026:36820
access.redhat.com / errata/RHSA-2026:37390
access.redhat.com / errata/RHSA-2026:42644
access.redhat.com / security/cve/CVE-2026-42584
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-42584.json
github.com / netty/netty/security/advisories/GHSA-57rv-r2g8-2cj3
ExploitVendor Advisory