2.3

CVE-2026-78253: qt Uncontrolled Recursion

CVSS: 2.3v4.0LowAwaiting analysis
AliasesUBUNTU-CVE-2026-78253DEBIAN-CVE-2026-78253
Published 23-09-2026Last modified 23-09-2026
Open JSON

Vulnerability summary

CVE-2026-78253 is a low (CVSS 2.3) Uncontrolled Recursion vulnerability in qt. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.8% of scored vulnerabilities.

Overall risk
9/100
0100
Minimal · default modelHow is this calculated?
CVSS score
2.3/10
010
Low · v4.0 (CVE.org)
EPSS score
0.25%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
OPENSUSE-SU-2026:12071-1RHSA-2026:59393

Timeline

  1. 23-09-2026
    PublishedVulnerability first disclosed.
  2. 23-09-2026
    Last modifiedVulnerability information updated.

Description

Uncontrolled recursion in QXmlStreamReader::readElementText() in Qt Group Qt allows attackers to cause a denial of service (application crash via stack exhaustion) via a crafted XML document.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

24-09-202621-10-2026
EPSS score
0.25%

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

Debian2 products
  • qt6-baseAll versions (No fix recorded) | < 6.11.2+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≥ 5.0.0, ≤ 6.8.8 | ≥ 6.9.0, ≤ 6.11.1

3 vendors · 5 products

References

4 links