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CVE-2026-15037XML injection vulnerability in QDom comment, CDATA and processing-instruction serialization

Description

Improper output neutralization (XML injection) in QDom comment, CDATA, and processing-instruction serialization in Qt XML from 4.0.0 through 6.11 allows untrusted text serialized by an application into those nodes to inject arbitrary XML markup, because the node terminators are not escaped under the default InvalidDataPolicy (AcceptInvalidChars). Fixed in Qt 6.12.

Timeline

  1. ID reserved

    By TQtC

  2. · 15 days later

    Published

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-2026-15037, by who scored it
Scored byCVSSScoreVector
TQtCCNA (assigner)4.0Low2.9CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
NVDNVD · Deferred4.0Low2.9CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.44% · top 61% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.9.

Affected products

  • Qt · Qt

    • affected 4.0.0 – < 6.12.0

What to do

Solution: Update to Qt 6.12 or later.

Workaround: On all affected versions, set the invalid-data policy before building documents:QDomImplementation::setInvalidDataPolicy(QDomImplementation::ReturnNullNode); (or DropInvalidChars). With ReturnNullNode, the QDom factory functions return a null node when given data that is invalid per XML 1.0 — check the return value. As additional defence-in-depth, validate untrusted input before inserting it and do not treat QDom output as trusted structure downstream.

References

References1

Sources

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

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Record last updated .