8.4

CVE-2025-5455: qt Improper Input Validation

CVSS: 8.4v4.0HighDeferred
AliasesMGASA-2025-0212RHSA-2025:11841RHSA-2025:9462
Published 02-06-2025Last modified 29-07-2026
Open JSON

Vulnerability summary

CVE-2025-5455 is a high (CVSS 8.4) Improper Input Validation vulnerability in qt. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.8% of scored vulnerabilities.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.4/10
010
High · v4.0 (CVE.org)
EPSS score
0.38%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
SUSE-SU-2025:02968-1SUSE-SU-2025:03599-1SUSE-SU-2025:3723-1

Timeline

  1. 02-06-2025
    PublishedVulnerability first disclosed.
  2. 29-07-2026
    Last modifiedVulnerability information updated.

Description

An issue was found in the private API function qDecodeDataUrl() in QtCore, which is used in QTextDocument and QNetworkReply, and, potentially, in user code. If the function was called with malformed data, for example, an URL that contained a "charset" parameter that lacked a value (such as "data:charset,"), and Qt was built with assertions enabled, then it would hit an assertion, resulting in a denial of service (abort). This impacts Qt up to 5.15.18, 6.0.0->6.5.8, 6.6.0->6.8.3 and 6.9.0. This has been fixed in 5.15.19, 6.5.9, 6.8.4 and 6.9.1.

CVSS metrics

5 scores · 5 sources · 2 versions

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

0.00 pp

From 0.38% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.38%

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

Redhat38 products
  • qt5-qtbase< 0:5.15.9-11.el9_4 | < 0:5.15.9-11.el9_6
  • qt5-qtbase-common< 0:5.15.9-11.el9_4 | < 0:5.15.9-11.el9_6
  • qt5-qtbase-debuginfo< 0:5.15.9-11.el9_4 | < 0:5.15.9-11.el9_6
  • qt5-qtbase-debugsource< 0:5.15.9-11.el9_4 | < 0:5.15.9-11.el9_6
  • qt5-qtbase-devel< 0:5.15.9-11.el9_4 | < 0:5.15.9-11.el9_6
Ubuntu3 products
  • qt6-baseAll versions (No fix recorded)
  • qtbase-opensource-srcAll versions (No fix recorded)
  • qtbase-opensource-src-glesAll versions (No fix recorded)
Debian2 products
  • qt6-baseAll versions (No fix recorded) | < 6.8.2+dfsg-8
  • qtbase-opensource-srcAll versions (No fix recorded) | < 5.15.15+dfsg-6
Mageia2 products
  • qtbase5< 5.15.7-6.2.mga9
  • qtbase6< 6.4.1-5.2.mga9
Opensuse1 product
  • libqt5-qtbase&distro=openSUSE Tumbleweed< 5.15.17+kde122-2.1
Qt1 product
  • qtEOL≤ 5.15.18 | ≥ 6.0.0, ≤ 6.5.8 | ≥ 6.6.0, ≤ 6.8.3 | 6.9.0

6 vendors · 47 products

References

18 links
Show all 18 references