# CVE-2026-9769

## Summary

- **CVE ID:** CVE-2026-9769
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-674
- **Published:** Aug 23, 2026
- **Last Modified:** Aug 24, 2026

## 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.

## Affected Products

- EmilStenstrom — justhtml (0)
- EmilStenstrom — justhtml (1.10.0)

## References

- [CNA](https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-v7cf-c9rm-wm3j)
- [CNA](https://www.vulncheck.com/advisories/justhtml-before-denial-of-service-via-deeply-nested-html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._