CVE-2026-9769

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-23. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 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.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

August 23, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Aug 23, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

justhtml before 1.10.0 Denial of Service via deeply nested HTML | Advisories | VulnCheck

https://www.vulncheck.com/advisories/justhtml-before-denial-of-service-via-deeply-nested-html
github Patch Available🟡 PoC Available

Uncontrolled recursion DoS in JustHTML() via deeply nested HTML · Advisory · EmilStenstrom/justhtml · GitHub

https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-v7cf-c9rm-wm3j

Vendor Advisories for CVE-2026-9769(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
justhtml0.1.0 ... 1.9.1 (54 versions)1.10.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-26 17:24 UTCEG score recompute
  2. 2026-08-26 14:47 UTCEPSS rescore
  3. 2026-08-25 18:14 UTCEG score recompute
  4. 2026-08-25 13:49 UTCEPSS rescore
  5. 2026-08-25 06:18 UTCGHSA enrichment
  6. 2026-08-24 18:24 UTCEG score recompute
  7. 2026-08-24 18:24 UTCGHSA enrichment
  8. 2026-08-24 18:02 UTCEG score recompute
  9. 2026-08-24 18:02 UTCGHSA enrichment
  10. 2026-08-24 14:18 UTCEPSS rescore
  11. 2026-08-24 14:14 UTCGHSA enrichment
  12. 2026-08-24 02:20 UTCEG score recompute
  13. 2026-08-24 02:19 UTCGHSA enrichment
  14. 2026-08-23 14:20 UTCEG score recompute
  15. 2026-08-23 13:51 UTCEG score recompute
  16. 2026-08-23 13:50 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-9769?
CVE-2026-9769 is a high vulnerability published on August 23, 2026. 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 populateselectedcontent(), which recursively traverses the DOM tree via findelements()/findelement() without a…
When was CVE-2026-9769 disclosed?
CVE-2026-9769 was first published in the National Vulnerability Database on August 23, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9769 actively exploited?
CVE-2026-9769 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 80.2% of all scored CVEs.
What is the CVSS score of CVE-2026-9769?
CVE-2026-9769 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-9769?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9769, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-9769

Explore →

Is Your Infrastructure Affected by CVE-2026-9769?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs