CVE-2025-3512

Application crash via truncated front-matter delimiter

Published Apr 11, 2025 · Updated Jul 29, 2026

Heap-based buffer overflow in Qt 6.8.0 through 6.8.3 allows context-dependent attackers to crash applications via malformed Markdown. QTextMarkdownImporter accepts a front-matter closing marker at the end of input, then QStringView::sliced() reads past the string because no trailing newline remains. Exploitation requires a crafted Markdown file to reach an application that invokes the importer; the published consequence is an application crash.

CVSS severity4.8
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Qt 6.8.0 through 6.8.3 allows context-dependent attackers to crash applications via malformed Markdown. QTextMarkdownImporter accepts a front-matter closing marker at the end of input, then QStringView::sliced() reads past the string because no trailing newline remains. Exploitation requires a crafted Markdown file to reach an application that invokes the importer; the published consequence is an application crash.

The record

CVE
CVE-2025-3512
Published
Apr 11, 2025
Updated
Jul 29, 2026
Vendor
The Qt Company
Product
Qt Framework
Classifications
CWE-122, CAPEC-92, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.8.0 <6.8.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Qt Company · Qt Frameworkversion=6.8.0 <6.8.4

Published CVSS scores

4.8The Qt Company CNACVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CAPEC-92Forced Integer Overflow
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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