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CVE-2026-114605— dnspython dns.name.from_wire_parser() excessive CPU use

Quick assessment

Affected
rthalley dnspython
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.

dnspython 是一个用于 Python 的 DNS 工具包。在 2.9.0 版本之前， 函数在解析 DNS 压缩指针链时未设置跳转次数限制，从而允许攻击者控制指针链的长度。恶意的 DNS 二进制格式消息可迫使名称解压缩过程中进行过度的指针遍历，导致处理不可信 DNS 消息的应用出现 CPU 占用率过高、性能下降，甚至拒绝服务（DoS）。该问题已在 2.9.0 版本中修复。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
rthalley dnspython < 2.9.0 affected
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I. Basic Information for CVE-2026-114605

Vulnerability Information
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Vulnerability Title
dnspython dns.name.from_wire_parser() excessive CPU use
Source: CVE Program / CVE List V5
Vulnerability Description
dnspython is a DNS toolkit for Python. Prior to 2.9.0, dns.name.from_wire_parser follows attacker-controlled DNS compression pointer chains without a hop limit. A malicious DNS wire-format message can force excessive pointer traversal during name decompression, causing high CPU use, application degradation, or denial of service in applications that process untrusted DNS messages. This issue is fixed in version 2.9.0.
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
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
rthalley dnspython < 2.9.0 -

II. Public POCs for CVE-2026-114605

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III. Intelligence Information for CVE-2026-114605

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Patches & Fixes for CVE-2026-114605 (1)

Vendor Advisories for CVE-2026-114605 (1)

Vendor Pages for CVE-2026-114605 (1)

IV. Related Vulnerabilities

Same weakness: CWE-674

V. Comments for CVE-2026-114605

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