CVE-2026-105923 — Null-pointer dereference in QTriangulator reachable through VectorImage

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Qt Qt).
2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
3. Exploitation requires user interaction: tighten email/web filtering and warn affected users.
4. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-190 · Integer Overflow or Wraparound

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
• Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · qt/qt
  Oct 21, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 21, 2026
• CVSS changed · 4.0
  Oct 21, 2026 · NIST National Vulnerability Database
• Source status changed · → Received
  Oct 21, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 21, 2026 · Alertas do Telegram
• CVE published
  Oct 21, 2026 · Qt

Source activity

Repeated readings are counted rather than listed.

• 1× References added · Oct 21, 2026 – Oct 21, 2026
• 1× Official description updated · Oct 21, 2026 – Oct 21, 2026

References

2 on the record

• codereview.qt-project.org/c/qt%2Fqtbase/+/762279
  patch, NIST National Vulnerability Database
• wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products
  vendor-advisory, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• Medium CVE-2026-101201 QBinaryJson::fromBinaryData() integer overflow leading to OOB read 1d
• High CVE-2026-8168 Denial-of-service vulnerability in the SVG parser and renderer impacts Qt 2d
• Medium CVE-2026-79680 Authentication bypass vulnerability in the password authentication mechanism of the Qt VNC Server module 27d
• Low CVE-2026-78253 Denial-of-service (stack-exhaustion) vulnerability in QXmlStreamReader::readElementText() impacts Qt 28d
• Low CVE-2026-79616 Out-of-bounds read vulnerability in Context2D.path and PathSvg.path properties impacts Qt Quick 28d
• Medium CVE-2026-76151 Out-of-bounds read (buffer over-read) vulnerability in HTTP Cache-Control response header parsing impacts Qt Framework (QtNetwork module) Sep 16, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No FIRST EPSS score.
• No fixed version, patch or mitigation documented.
• No CISA SSVC assessment.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-105923 is "Null-pointer dereference in QTriangulator reachable through VectorImage", rated Medium. It affects Qt (Qt); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.0 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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