CVE-2026-9769

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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
githubMentions a patch (unverified)🟡 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 rangeFix by version rangeDependents
justhtml0.1.0 ... 1.9.1 (54 versions)
  • every version up to 1.10.0: fixed in 1.10.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 56× 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. 2026-10-10 20:01 UTCEPSS rescore
  2. 2026-10-10 13:22 UTCEG score recompute
  3. 2026-10-09 20:08 UTCEPSS rescore
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  5. 2026-10-08 17:14 UTCEPSS rescore
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  7. 2026-10-07 23:48 UTCEPSS rescore
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  13. 2026-10-04 23:23 UTCEPSS rescore
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  15. 2026-10-03 14:26 UTCEPSS rescore
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  17. 2026-10-02 17:57 UTCEPSS rescore
  18. 2026-10-01 21:10 UTCEG score recompute
  19. 2026-10-01 19:51 UTCEPSS rescore
  20. 2026-09-30 20:20 UTCEG score recompute
  21. 2026-09-30 15:04 UTCEPSS rescore
  22. 2026-09-30 07:22 UTCEG score recompute
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  24. 2026-09-29 00:32 UTCEG score recompute
  25. 2026-09-28 13:52 UTCEPSS rescore
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  1. 2026-09-28 00:41 UTCEG score recompute
  2. 2026-09-27 13:49 UTCEPSS rescore
  3. 2026-09-27 00:52 UTCEG score recompute
  4. 2026-09-26 15:59 UTCEPSS rescore
  5. 2026-09-25 00:29 UTCEG score recompute
  6. 2026-09-24 14:04 UTCEPSS rescore
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  8. 2026-09-23 17:54 UTCEPSS rescore
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  10. 2026-09-22 16:01 UTCEPSS rescore
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  12. 2026-09-21 21:09 UTCEPSS rescore
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  14. 2026-09-20 20:16 UTCEPSS rescore
  15. 2026-09-20 00:44 UTCEG score recompute
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  17. 2026-09-18 19:28 UTCEPSS rescore
  18. 2026-09-18 01:03 UTCEG score recompute
  19. 2026-09-17 19:32 UTCEPSS rescore
  20. 2026-09-17 00:49 UTCEG score recompute
  21. 2026-09-16 14:09 UTCEPSS rescore
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  23. 2026-09-16 05:15 UTCEPSS rescore
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  25. 2026-09-15 03:12 UTCEPSS rescore
  26. 2026-09-14 01:18 UTCEG score recompute
  27. 2026-09-13 16:48 UTCEPSS rescore
  28. 2026-09-13 01:28 UTCEG score recompute
  29. 2026-09-12 15:02 UTCEPSS rescore
  30. 2026-09-12 01:38 UTCEG score recompute
  31. 2026-09-11 14:53 UTCEPSS rescore
  32. 2026-09-10 13:53 UTCEG score recompute
  33. 2026-09-10 09:35 UTCEPSS rescore
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  35. 2026-09-08 22:01 UTCEPSS rescore
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  38. 2026-09-06 13:48 UTCEPSS rescore
  39. 2026-09-05 20:54 UTCEG score recompute
  40. 2026-09-05 15:31 UTCEPSS rescore
  41. 2026-09-04 21:04 UTCEG score recompute
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  43. 2026-09-04 05:07 UTCEPSS rescore
  44. 2026-09-02 20:49 UTCEG score recompute
  45. 2026-09-02 14:12 UTCEPSS rescore
  46. 2026-09-01 17:52 UTCEG score recompute
  47. 2026-09-01 13:54 UTCEPSS rescore
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  50. 2026-08-31 05:47 UTCEG score recompute
  51. 2026-08-30 19:18 UTCEPSS rescore
  52. 2026-08-30 05:57 UTCEG score recompute
  53. 2026-08-30 01:22 UTCEPSS rescore
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  55. 2026-08-28 21:42 UTCEPSS rescore
  56. 2026-08-27 18:16 UTCEG score recompute
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  59. 2026-08-26 14:47 UTCEPSS rescore
  60. 2026-08-25 18:14 UTCEG score recompute
  61. 2026-08-25 13:49 UTCEPSS rescore
  62. 2026-08-25 06:18 UTCGHSA enrichment
  63. 2026-08-24 18:24 UTCEG score recompute
  64. 2026-08-24 18:24 UTCGHSA enrichment
  65. 2026-08-24 18:02 UTCEG score recompute
  66. 2026-08-24 18:02 UTCGHSA enrichment
  67. 2026-08-24 14:18 UTCEPSS rescore
  68. 2026-08-24 14:14 UTCGHSA enrichment
  69. 2026-08-24 02:20 UTCEG score recompute
  70. 2026-08-24 02:19 UTCGHSA enrichment
  71. 2026-08-23 14:20 UTCEG score recompute
  72. 2026-08-23 13:51 UTCEG score recompute
  73. 2026-08-23 13:50 UTCMITRE cvelistV5first tracked

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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 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 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-9769?
CVE-2026-9769 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-9769?
A fix for CVE-2026-9769 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-9769 are linked in the Vendor Advisories panel on this page.

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