Vulnerability · Published Oct 19, 2026 · Assigned by Qt
CVE-2026-8168Denial-of-service vulnerability in the SVG parser and renderer impacts Qt
High 7.1
In plain English
A high-severity security flaw in qt from qt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)7.1High
Exploit odds (30 days)0.4%top 65.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | qt6-svg | no fix listed | DEBIAN-CVE-2026-8168 |
| Debian:13 | qt6-svg | no fix listed | DEBIAN-CVE-2026-8168 |
| Debian:14 | qt6-svg | 6.11.2-2 | DEBIAN-CVE-2026-8168 |
| Debian:12 | qtsvg-opensource-src | no fix listed | DEBIAN-CVE-2026-8168 |
| Debian:13 | qtsvg-opensource-src | no fix listed | DEBIAN-CVE-2026-8168 |
| Debian:14 | qtsvg-opensource-src | no fix listed | DEBIAN-CVE-2026-8168 |
| Ubuntu:22.04:LTS | qt6-svg | no fix listed | UBUNTU-CVE-2026-8168 |
| Ubuntu:24.04:LTS | qt6-svg | no fix listed | UBUNTU-CVE-2026-8168 |
| Ubuntu:26.04:LTS | qt6-svg | no fix listed | UBUNTU-CVE-2026-8168 |
| Ubuntu:26.10 | qt6-svg | no fix listed | UBUNTU-CVE-2026-8168 |
| Ubuntu:24.04:LTS | qtsvg-opensource-src | no fix listed | UBUNTU-CVE-2026-8168 |
| Ubuntu:26.04:LTS | qtsvg-opensource-src | no fix listed | UBUNTU-CVE-2026-8168 |
| Ubuntu:26.10 | qtsvg-opensource-src | no fix listed | UBUNTU-CVE-2026-8168 |
Affected products (as reported)
Weakness: CWE-674 · 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
References
- Propagate QSvgExtraStates variables to pattern and mask elements vendor-advisory
- Fix rendering causing stack overflow patch
- Fix resolving paint servers going through stack overflow patch
- Fix stack overflow caused by recursive calls of destructors patch
- Add a test for deeply nested SVG files patch
- Add baseline test for deeply nested elements patch
- Speed up QSvgStructureNode::releaseDescendants() patch
- Fix stack overflow in detectCycles patch
- Use bottom tested loop in detectCycles() patch
- Apply and revert styles iteratively patch
- Propagate QSvgExtraStates variables to pattern and mask elements patch