GHSA-892m-gcq8-2468: Duplicate Advisory Denial of Service Vulnerability

HIGH
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CVSS 7.5
CWE-674
Published
Advisory Summary

GHSA-892m-gcq8-2468 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-674: Uncontrolled Recursion) affecting Duplicate Advisory libraries in the PyPI ecosystem. The issue involves uncontrolled recursion dos in justhtml() via deeply nested html. Remediation is available in the latest vendor maintenance releases.

GHSA-892m-gcq8-2468 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-892m-gcq8-2468
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-674: Uncontrolled Recursion
Affected Product Duplicate Advisory
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix GHSA-892m-gcq8-2468

To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

justhtml fixed: Latest secure release 
pip install justhtml>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show justhtml

How to Check if You Are Affected

To determine whether your Python environment is affected by GHSA-892m-gcq8-2468, inspect your installed packages using pip:

pip show justhtml

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show justhtml command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-674: Uncontrolled Recursion, where the product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-v7cf-c9rm-wm3j. This link is maintained to preserve external references. ### Original 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.

GHSA-892m-gcq8-2468 Affected Duplicate Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
justhtml
pypi/justhtml
PyPI
≤ 1.9.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-v7cf-c9rm-wm3j
NVD — GHSA-892m-gcq8-2468 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9769
www.vulncheck.com/advisories/justhtml... WEB
https://www.vulncheck.com/advisories/justhtml-before-denial-of-service-via-deeply-nested-html

Frequently Asked Questions

What is GHSA-892m-gcq8-2468?
GHSA-892m-gcq8-2468 is a security vulnerability in Duplicate Advisory involving Uncontrolled recursion DoS in JustHTML() via deeply nested HTML under CWE-674: Uncontrolled Recursion.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: justhtml.
What version fixes GHSA-892m-gcq8-2468?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is justhtml affected?
Yes, justhtml is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of GHSA-892m-gcq8-2468?
GHSA-892m-gcq8-2468 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with GHSA-892m-gcq8-2468?
GHSA-892m-gcq8-2468 is classified under CWE-674: Uncontrolled Recursion (The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.).
How can I check PyPI dependencies for GHSA-892m-gcq8-2468?
Run the dependency tree command: 'pip show justhtml'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-892m-gcq8-2468",
  "modified" : "2026-08-25T16:40:27Z",
  "published" : "2026-08-23T15:33:06Z",
  "withdrawn" : "2026-08-25T16:40:27Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: Uncontrolled recursion DoS in JustHTML() via deeply nested HTML",
  "details" : "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-v7cf-c9rm-wm3j. This link is maintained to preserve external references.\n\n### Original Description\njusthtml 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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "justhtml"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.9.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-v7cf-c9rm-wm3j"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-9769"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/justhtml-before-denial-of-service-via-deeply-nested-html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-674" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-25T16:40:27Z",
    "nvd_published_at" : "2026-08-23T14:16:55Z"
  }
}