CVE-2026-78253

Denial-of-service (stack-exhaustion) vulnerability in QXmlStreamReader::readElementText() impacts Qt

CVE-2026-78253 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-78253, released October 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

n/a

Low

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0043

37th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
qt6-base · Debian 14	6.11.2+dfsg-5	DEBIAN-CVE-2026-78253	Oct 4, 2026
qtbase-opensource-src · Debian 14	5.15.19+dfsg-6	DEBIAN-CVE-2026-78253	Oct 4, 2026

Details

Published
September 23, 2026
Weakness
Uncontrolled Recursion
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78253

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