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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| qt | qt | 4.1.0 – < 6.8.9, 6.9.0 – < 6.11.2 | 6.8.9 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | qt6-svg | 6.11.2-2 | — |
| Debian 14 | qtsvg-opensource-src | No fix yet | — |
| Debian 13 | qt6-svg +1 | No fix yet | — |
| Debian 12 | qt6-svg +1 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | qt6-svg +1 | No fix yet | — |
| Ubuntu 26.04 LTS | qt6-svg +1 | No fix yet | — |
| Ubuntu 24.04 LTS | qt6-svg +1 | No fix yet | — |
| Ubuntu 22.04 LTS | qt6-svg | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | qtsvg-opensource-src | No fix yet | — |
| Ubuntu Pro 20.04 LTS | qtsvg-opensource-src | No fix yet | — |
| Ubuntu Pro 18.04 LTS | qtsvg-opensource-src | No fix yet | — |
| Ubuntu Pro 16.04 LTS | qtsvg-opensource-src | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | qt6-qtsvg +2 | 6.11.2-1.hum1 | RHSA-2026:58460 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | qtsvg | No fix yet | — |
Advisories 2
- RHSA-2026:58460 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- WID-SEC-2026-4037 QT: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 19, 2026
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