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CVE-2026-43980 medium CVSS 6.3

Cross-Site Scripting (XSS) in malla (CVE-2026-43980)

Summary

Cross-site scripting in malla (CVE-2026-43980). Risk of unauthorized operations or information disclosure.

Original description

The description as published by the source.

Node names (long_name, short_name) received via MQTT are stored in SQLite without sanitization and rendered into the DOM without escaping.
Any participant on a public Meshtastic MQTT broker can set a malicious node name that executes JavaScript in the browser of every Malla dashboard visitor.

Affected files:

  • src/malla/templates/traceroute_graph.html (line ~832)
  • src/malla/templates/map.html (lines ~945, 1078)
  • src/malla/templates/packet_detail.html (lines ~1402, 1452)
  • src/malla/static/js/relay_node_analysis.js (line ~124)

Steps to reproduce

  1. Publish a Meshtastic NODEINFO_APP packet to any public MQTT broker with long_name set to a HTML entity i.e ``
  2. Wait for malla-capture to store it
  3. Open the dashboard

Impact

Allows unauthenticated remote attackers to execute arbitrary JavaScript in the browser, such as:

  • Phishing overlays
  • Force redirect to malicious websites
  • Injection of arbitrary third-party scripts (no CSP restrictions)
  • Browser resource abuse
  • Persistent dashboard denial of service

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-43980 has been found in malla.
Risk of unauthorized operations or information disclosure. CVSS score: 6.3/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "malla CVE-2026-43980" on the vendor's site.

CVE-2026-43980 (malla) — CWE-79 / CVSS v3 6.3
Attack vector: remote (network-reachable) / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Cross-site scripting (XSS) (CWE-79) exists in malla.

📍 Affected scope

Check the vendor advisory for the affected versions of malla.

🔥 Severity

Severity: Medium (CVSS 6.3/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'malla' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'malla' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で malla を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip malla
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
PyPI malla
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.1.7"}]}]

References

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