CVE WatchAug 23, 2026

CVE-2026-9769

justhtml through 1.9.1 (fixed in 1.10.0) is vulnerable to uncontrolled recursion leading to denial of service. During JustHTML() constructio

CVSS

7.5

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 23, 2026 · Last modified: Aug 23, 2026 · CWE-674

EPSS · 30d

Not enough EPSS history yet.

Technical description

justhtml through 1.9.1 (fixed in 1.10.0) is vulnerable to uncontrolled recursion leading to denial of service. During JustHTML() construction, TreeBuilder.finish() unconditionally calls _populate_selectedcontent(), which recursively traverses the DOM tree via _find_elements()/_find_element() without a depth bound. An attacker who can supply HTML for parsing can provide deeply nested elements (e.g., ~1000 nested <div> tags, roughly 11 KB) to exceed CPython's default recursion limit and trigger an unhandled RecursionError, which may abort parsing, fail requests, or terminate a worker/process depending on the host application's exception handling.

Official references

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