CVE-2026-45536

Service interruption via Unix-socket descriptor leaks

Published Jun 12, 2026 · Updated Jun 12, 2026

File-descriptor leak in Netty before 4.1.135.Final and 4.2.0.Final through 4.2.14.Final allows local users to exhaust process descriptors. netty_unix_socket_recvFd accepts an SCM_RIGHTS control message containing two descriptors, rejects its unexpected length, and closes neither installed descriptor. Exploitation requires a Unix-domain-socket peer and the non-default FILE_DESCRIPTORS read mode; repeated messages can exhaust the process limit and interrupt service.

CVSS severity4.0
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

File-descriptor leak in Netty before 4.1.135.Final and 4.2.0.Final through 4.2.14.Final allows local users to exhaust process descriptors. netty_unix_socket_recvFd accepts an SCM_RIGHTS control message containing two descriptors, rejects its unexpected length, and closes neither installed descriptor. Exploitation requires a Unix-domain-socket peer and the non-default FILE_DESCRIPTORS read mode; repeated messages can exhaust the process limit and interrupt service.

The record

CVE
CVE-2026-45536
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
The Netty Project
Product
Netty
Classifications
T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.1.135.Final
  2. Affected versionversion=>= 4.2.0.Final, < 4.2.15.Final

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Netty Project · Nettyversion=< 4.1.135.Final; version=>= 4.2.0.Final, < 4.2.15.Final

Published CVSS scores

4.0GitHub Security AdvisoryCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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