7.1

CVE-2026-11573: qt Uncontrolled Recursion

CVSS: 7.1v4.0HighDeferred
AliasesRHSA-2026:74653UBUNTU-CVE-2026-11573DEBIAN-CVE-2026-11573
Published 08-09-2026Last modified 11-09-2026
Open JSON

Vulnerability summary

CVE-2026-11573 is a high (CVSS 7.1) Uncontrolled Recursion vulnerability in qt. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.3% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.39%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-09-2026
    PublishedVulnerability first disclosed.
  2. 11-09-2026
    Last modifiedVulnerability information updated.

Description

Uncontrolled recursion (CWE-674) in the QDomDocument/QDomNode serialization path of the Qt XML module (QtXml, qtbase). QDomElementPrivate::save() and QDomNodePrivate::save() recurse mutually, consuming one stack frame per level of element nesting with no depth limit, no configurable bound and no error return. A document with deeply nested elements parses successfully but exhausts the call stack and terminates the process when serialized. Reachable via QDomDocument::toByteArray() (Qt 4.0 and later), QDomDocument::toString(), QDomDocument::toCString(), QDomNode::save(), and operator<<(QTextStream&, const QDomNode&). Denial of service only — no code execution and no memory disclosure.

CVSS metrics

5 scores · 5 sources · 2 versions

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

0.00 pp

From 0.39% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.39%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat20 products
  • qt6-qtbase< 0:6.11.2-3.hum1 | < 0:6.8.1-9.el10_0.1
  • qt6-qtbase-common< 0:6.11.2-3.hum1 | < 0:6.8.1-9.el10_0.1
  • qt6-qtbase-debuginfo< 0:6.8.1-9.el10_0.1
  • qt6-qtbase-debugsource< 0:6.8.1-9.el10_0.1
  • qt6-qtbase-devel< 0:6.11.2-3.hum1 | < 0:6.8.1-9.el10_0.1
Debian2 products
  • qt6-baseAll versions (No fix recorded) | < 6.8.2+dfsg-5
  • qtbase-opensource-srcAll versions (No fix recorded)
Ubuntu2 products
  • qt6-baseAll versions (No fix recorded)
  • qtbase-opensource-srcAll versions (No fix recorded)
Qt1 product
  • qt≥ 2.2.0, < 6.8.2

4 vendors · 25 products

References

16 links
Show all 16 references