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CVE-2026-80212

Quick assessment

Affected
Ruby resolv
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.

Ruby Resolv是Ruby组织的一个用 Ruby 编写的线程感知型 DNS 解析器库。 Ruby Resolv 0.7.2之前版本存在资源管理错误漏洞，该漏洞源于解码DNS响应时对未知DNS资源记录类型/类对生成新类并永久注册，导致进程内存无限增长，可能造成拒绝服务。

CVSS 7.5 · High EPSS 0.40% · P33

Affected Version Matrix 2

VendorProduct Version RangeStatus
Ruby resolv < 0.3.2 affected
0.4.0< 0.7.2 affected
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I. Basic Information for CVE-2026-80212

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in the resolv gem before 0.7.2 for Ruby. Resolv::DNS::Resource.get_class, Resolv::DNS::Resource::Generic.create, and Resolv::DNS::SvcParam::Generic.create generate a new class for each unknown DNS resource record (type, class) pair, or each unknown SvcParamKey, encountered while decoding a response. Each generated class was permanently registered both as a constant on Resource (or SvcParam::Generic) and as an entry in a class-lookup hash (ClassHash), and thus the class remained reachable through that constant after the response was discarded. Type and class are each 16-bit values, and thus an attacker controlling DNS responses (a spoofed response, or a malicious or hijacked upstream DNS server) has roughly 2^32 distinct (type, class) pairs to choose from. A single response of a few hundred kilobytes carrying tens of thousands of distinct unknown types permanently grows process memory by tens of megabytes; repeated responses accumulate without bound and are never reclaimed by garbage collection, because the constant keeps each class alive. Any code path that calls Resolv::DNS::Message.decode on attacker-influenced DNS responses is affected. resolv is a default gem, and thus this is reachable from a plain Ruby installation without any additional dependency.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Ruby Resolv 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ruby Resolv是Ruby组织的一个用 Ruby 编写的线程感知型 DNS 解析器库。 Ruby Resolv 0.7.2之前版本存在资源管理错误漏洞，该漏洞源于解码DNS响应时对未知DNS资源记录类型/类对生成新类并永久注册，导致进程内存无限增长，可能造成拒绝服务。
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
Ruby resolv 0 ~ 0.3.2 -

II. Public POCs for CVE-2026-80212

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III. Intelligence Information for CVE-2026-80212

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Vendor Advisories for CVE-2026-80212 (1)

Proof of Concept for CVE-2026-80212 (1)

IV. Related Vulnerabilities

Same product: resolv
Same vendor: Ruby
Same weakness: CWE-770

V. Comments for CVE-2026-80212

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