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CVE-2026-104874— Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction

Quick assessment

Affected
aio-libs multidict
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.

以下是该漏洞描述信息的中文翻译： Multidict 是一个多维字典（multidict）数据结构的实现。从版本 6.7.0 到 6.9.1 版本，C 扩展中的以下操作存在引用释放失败的问题：在 函数中，并集操作（即 ）未释放为新每个操作数元素返回的新键标识和值引用；在 函数中，差集操作（即 ）也未能释放这些引用。对于 attacker（攻击者）可影响的序列执行这些操作的应用程序，每个元素可能泄露两个强引用，而垃圾回收机制无法回收这些引用，因此重复执行这些操作可能导致进程内存无限增长，进而引发拒绝服务（DoS）攻击

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-104874

Vulnerability Information
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Vulnerability Title
Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction
Source: CVE Program / CVE List V5
Vulnerability Description
Multidict is an implementation of a multidict data structure. From 6.7.0 until 6.9.1, the C extension's items-view reflected union operation, operand | d.items(), in multidict_itemsview_or2_impl and subtraction operation, d.items() - operand, in multidict_itemsview_sub1_impl fail to release new key-identity and value references returned for each operand element. Applications that perform these operations over attacker-influenced sequences can leak two strong references per element, and garbage collection cannot reclaim them, so repeated operations can cause unbounded process memory growth and denial of service. Forward union, intersection, non-tuple operand elements, and pure-Python builds are not affected by this reference leak. This issue is fixed in version 6.9.1.
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
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
aio-libs multidict >= 6.7.0, < 6.9.1 -

II. Public POCs for CVE-2026-104874

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III. Intelligence Information for CVE-2026-104874

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Patches & Fixes for CVE-2026-104874 (1)

Vendor Advisories for CVE-2026-104874 (1)

Vendor Pages for CVE-2026-104874 (1)

IV. Related Vulnerabilities

Same vendor: aio-libs
Same weakness: CWE-401

V. Comments for CVE-2026-104874

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