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No exploitation reportedFix available

CVE-2026-73508

No exploitation reported by the sources we read.

  • Published2026-08-13
  • Fixed in4.2.16.Final · 4.1.136.Final
  • WeaknessCWE-772

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.dns.AbstractDnsRecord, io.netty.handler.codec.dns.DefaultDnsRecordDecoder.decodeRecord(), and io.netty.handler.codec.dns.DnsCodecUtil.decompressDomainName() failed to release retained or newly allocated ByteBuf objects when IDN.toASCII() or encodeDomainName() rejected a malformed domain name, allowing unauthenticated remote DNS packets to leak direct memory incrementally until denial of service. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Timeline

dates in UTC
  1. 2026-08-1315:20CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-04 03:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-73508?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-73508?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV · NVD
netty-codec-dns
BranchAffectedFixed in
4.2≥ 4.2.0.Final, < 4.2.16.Final4.2.16.Final
4.1< 4.1.136.Final4.1.136.Final
Netty
BranchAffectedFixed in
4.2≥ 4.2.0, < 4.2.164.2.16
4.1< 4.1.1364.1.136

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • netty
    Affected
    • = < 4.1.136.Finalno fix stated
    • = >= 4.2.0.Final, < 4.2.16.Finalno fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-08-13

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • akhqWolfiall versions · fixed in 0.27.1-r14
  • akhqChainguardall versions · fixed in 0.27.1-r14
  • apache-druidMinimOSall versions · fixed in 38.0.0-r0and 1 other package
  • apache-hopMinimOSall versions · fixed in 2.19.0-r0and 1 other package
  • apache-iceberg-sink-connectorMinimOSall versions · fixed in 1.12.0-r0and 1 other package
  • apache-nifiWolfiall versions · fixed in 2.10.0-r9
  • apache-nifiChainguardall versions · fixed in 2.10.0-r9
  • apache-pulsar-4.1Wolfiall versions · fixed in 4.1.3-r15

164 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-73508 Red Hat Product Security479 products fixed · 24 known affected

    io.netty/netty-codec-dns: Netty: Denial of Service via Memory Leak in DNS Record Decoder with Malformed Domain Names

    exploit-intelligence/agent-client-rhel9 as a component of Exploit Intelligence · openshift-serverless-1/kn-ekb-dispatcher-rhel9 as a component of OpenShift Serverless · openshift-serverless-1/kn-ekb-receiver-rhel9 as a component of OpenShift Serverless · +21 more

  • RHSA-2026:90321 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.31.0 Release.

  • RHSA-2026:87410 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI

  • RHSA-2026:86891 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.5.2 - Red Hat OpenShift AI

  • RHSA-2026:84734 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

  • RHSA-2026:83612 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat build of Debezium 3.6.3 release

6 more advisories

Full record on NVD

Fix

  1. Update netty-codec-dns to 4.2.16.Final · 4.1.136.Final
  2. Vendor fix Red Hat Product Security RHSA-2026:90321 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2026:87410 · 4 productsFor Red Hat OpenShift AI 2.25.12 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  4. Vendor fix Red Hat Product Security RHSA-2026:86891 · 4 productsFor Red Hat OpenShift AI 3.5.2 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  5. Vendor fix Red Hat Product Security RHSA-2026:84734 · 13 productsFor Red Hat OpenShift AI 3.4.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  6. Vendor fix Red Hat Product Security RHSA-2026:83612 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  7. Vendor fix Red Hat Product Security RHSA-2026:70277 · 1 productBefore applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://acce…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-08-13
  • OpenCVESSVC decisionnone—
  • CNACVSS 3.15.3known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-772known since 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-11-03
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2026-07-24

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-08-13
Last Modified
2026-09-23
NVD status
Analyzed
GitHub Advisory
GHSA-mfg7-5gfp-c4w3

Frequently asked questions

What is CVE-2026-73508?

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.dns.AbstractDnsRecord, io.netty.handler.codec.dns.DefaultDnsRecordDecoder.decodeRecord(), and io.netty.handler.codec.dns.DnsCodecUtil.decompressDomainName() failed to release retained or newly allocated ByteBuf objects when IDN.toASCII() or encodeDomainName() rejected a malformed domain name, allowing unauthenticated remote DNS packets to leak direct memory incrementally until denial of service. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

Is CVE-2026-73508 actively exploited?

Active exploitation of CVE-2026-73508 has not been confirmed. Its EPSS score was 0.6% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-73508?

CVE-2026-73508 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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