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CVE-2026-44249

Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking

High8.1EPSS 0.99%
Published
Updated
Reserved
Assigned by
GitHub_M

Description

Netty is a network application framework for development of protocol servers and clients. In netty-handler prior to versions 4.1.135.Final and 4.2.15.Final, an attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Scores

CVSS scores of CVE-2026-44249, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1High8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
redhat-SADPADP (enrichment)3.1High8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1High8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.99% · top 37% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.

Weakness

Affected products

  • netty · netty

    • affected >= 4.2.0.Final, < 4.2.15.Final
    • affected < 4.1.135.Final

Affected packages

From reviewed advisories of the GitHub Advisory Database.

References (26)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .