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CVE-2025-5455Possible denial of service when passing malformed data in a URL to qDecodeDataUrl

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.

Timeline

  1. ID reserved

    By TQtC

  2. Published

  3. · 14 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-5455, by who scored it
Scored byCVSSScoreVector
TQtCCNA (assigner)4.0High8.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/R:U/RE:M/U:Clear
NVDNVD · Deferred4.0High8.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:M/U:Clear
EPSS (exploitation in 30 days)
0.40% · top 65% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.

Affected products

  • Qt · Qt

    • affected ≤ 5.15.18
    • affected 6.0.0 – ≤ 6.5.8
    • unaffected 6.5.9
    • affected 6.6.0 – ≤ 6.8.3
    • unaffected 6.8.4
    • affected 6.9.0
    • unaffected 6.9.1

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .