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CVE-2026-73508— Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names

Quick assessment

Affected
netty netty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netty是Netty团队开源的一个高性能网络通信框架。 Netty 4.1.136.Final之前版本和4.2.16.Final之前版本存在资源管理错误漏洞，该漏洞源于对畸形域名的处理过程中未正确释放ByteBuf对象，可能导致未经身份验证的远程DNS数据包逐步泄漏直接内存直至拒绝服务。

CVSS 5.3 · Medium EPSS 0.38% · P30

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty < 4.1.136.Final affected
>= 4.2.0.Final, < 4.2.16.Final affected
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I. Basic Information for CVE-2026-73508

Vulnerability Information
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Vulnerability Title
Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty团队开源的一个高性能网络通信框架。 Netty 4.1.136.Final之前版本和4.2.16.Final之前版本存在资源管理错误漏洞，该漏洞源于对畸形域名的处理过程中未正确释放ByteBuf对象，可能导致未经身份验证的远程DNS数据包逐步泄漏直接内存直至拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
netty netty < 4.1.136.Final -

II. Public POCs for CVE-2026-73508

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III. Intelligence Information for CVE-2026-73508

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Vendor Advisories for CVE-2026-73508 (1)

Vendor Pages for CVE-2026-73508 (2)

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-772

V. Comments for CVE-2026-73508

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