Missing Release of Memory after Effective Lifetime Affecting multidict package, versions [6.7.0,6.9.1)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-MULTIDICT-20510280
- published5 Oct 2026
- disclosed2 Oct 2026
- creditUnknown
Introduced: 2 Oct 2026
NewCVE-2026-104874 (opens in a new tab)How to fix?
Upgrade multidict to version 6.9.1 or higher.
Overview
Affected versions of this package are vulnerable to Missing Release of Memory after Effective Lifetime via a reference leak in the C extension's items view operations multidict_itemsview_or2_impl() and multidict_itemsview_sub1_impl(), which handle the operand | md.items() and md.items() - operand set operations respectively. For every element of the operand, the key identity and value references are not released after processing, causing memory to grow without bound when a large operand is used. An attacker can trigger unbounded memory growth by repeatedly invoking these operations with large operands, resulting in a denial of service.