Описание
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.
A flaw was found in multidict. The multidict C extension fails to release object references during certain items-view union and subtraction operations. An attacker could exploit this vulnerability by supplying crafted input sequences to applications performing these operations, triggering uncollectable memory leaks. This issue can cause unbounded process memory growth, ultimately leading to a Denial of Service (DoS).
Отчет
This vulnerability is rated as having Moderate impact for Red Hat products because triggering the memory leak requires an application to evaluate specific items-view set operations against untrusted user input, which is uncommon across standard deployments. While multiple Red Hat services bundle multidict, exploitation is limited to gradual memory exhaustion and denial of service, with no possibility of remote code execution or data disclosure. Furthermore, standard dictionary access patterns, forward unions, and intersections are not susceptible to this flaw.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Exploit Intelligence | exploit-intelligence/vulnerability-analysis-rhel9 | Out of support scope | ||
| Lightspeed Core | lightspeed-core/lightspeed-stack-rhel9 | Fix deferred | ||
| Lightspeed Core | lightspeed-core/rag-tool-cpu-rhel9 | Fix deferred | ||
| Lightspeed Core | lightspeed-core/rag-tool-cuda-12.9-rhel9 | Fix deferred | ||
| Migration Toolkit for Applications 8 | mta/mta-solution-server-rhel9 | Fix deferred | ||
| OpenShift Lightspeed | openshift-lightspeed/lightspeed-agentic-sandbox-rhel9 | Fix deferred | ||
| OpenShift Lightspeed | openshift-lightspeed/lightspeed-ocp-rag-rhel9 | Fix deferred | ||
| OpenShift Lightspeed | openshift-lightspeed/lightspeed-service-api-rhel9 | Fix deferred | ||
| OpenShift Lightspeed | openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9 | Fix deferred | ||
| Red Hat AI Inference Server | rhaiis/model-opt-cuda-rhel9 | Fix deferred |
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Дополнительная информация
Статус:
EPSS
5.3 Medium
CVSS3
Связанные уязвимости
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.
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.
Multidict is an implementation of a multidict data structure. From 6.7 ...
Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction
ELSA-2026-604898: python-oci-sdk security update (IMPORTANT)
EPSS
5.3 Medium
CVSS3