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Vulnerability Details :

CVE-2025-5991

Summary
Assigner-TQtC
Assigner Org ID-a59d8014-47c4-4630-ab43-e1b13cbe58e3
Published At-11 Jun, 2025 | 07:33
Updated At-11 Jun, 2025 | 13:18
Rejected At-
Credits

Use after free in QHttp2ProtocolHandler

There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module. This only affects HTTP/2 handling, HTTP handling is not affected by this at all. This happens due to a race condition between how QHttp2Stream uploads the body of a POST request and the simultaneous handling of HTTP error responses. This issue only affects Qt 6.9.0 and has been fixed for Qt 6.9.1.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:TQtC
Assigner Org ID:a59d8014-47c4-4630-ab43-e1b13cbe58e3
Published At:11 Jun, 2025 | 07:33
Updated At:11 Jun, 2025 | 13:18
Rejected At:
▼CVE Numbering Authority (CNA)
Use after free in QHttp2ProtocolHandler

There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module. This only affects HTTP/2 handling, HTTP handling is not affected by this at all. This happens due to a race condition between how QHttp2Stream uploads the body of a POST request and the simultaneous handling of HTTP error responses. This issue only affects Qt 6.9.0 and has been fixed for Qt 6.9.1.

Affected Products
Vendor
The Qt Company
Product
Qt
Default Status
unaffected
Versions
Affected
  • 6.9.0
Unaffected
  • From 0 before 6.9.0 (python)
  • 6.9.1
Problem Types
TypeCWE IDDescription
CWECWE-416CWE-416 Use After Free
Type: CWE
CWE ID: CWE-416
Description: CWE-416 Use After Free
Metrics
VersionBase scoreBase severityVector
4.02.1LOW
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
Version: 4.0
Base score: 2.1
Base severity: LOW
Vector:
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://codereview.qt-project.org/c/qt/qtbase/+/643777
N/A
Hyperlink: https://codereview.qt-project.org/c/qt/qtbase/+/643777
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:a59d8014-47c4-4630-ab43-e1b13cbe58e3
Published At:11 Jun, 2025 | 08:15
Updated At:12 Jun, 2025 | 16:06

There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module. This only affects HTTP/2 handling, HTTP handling is not affected by this at all. This happens due to a race condition between how QHttp2Stream uploads the body of a POST request and the simultaneous handling of HTTP error responses. This issue only affects Qt 6.9.0 and has been fixed for Qt 6.9.1.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.02.1LOW
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/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:X/V:X/RE:X/U:X
Type: Secondary
Version: 4.0
Base score: 2.1
Base severity: LOW
Vector:
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/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:X/V:X/RE:X/U:X
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-416Secondarya59d8014-47c4-4630-ab43-e1b13cbe58e3
CWE ID: CWE-416
Type: Secondary
Source: a59d8014-47c4-4630-ab43-e1b13cbe58e3
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://codereview.qt-project.org/c/qt/qtbase/+/643777a59d8014-47c4-4630-ab43-e1b13cbe58e3
N/A
Hyperlink: https://codereview.qt-project.org/c/qt/qtbase/+/643777
Source: a59d8014-47c4-4630-ab43-e1b13cbe58e3
Resource: N/A

Change History

0
Information is not available yet

Similar CVEs

1Records found
CVE-2025-10729
Matching Score-6
Assigner-The Qt Company
ShareView Details
Matching Score-6
Assigner-The Qt Company
CVSS Score-9.4||CRITICAL
EPSS-0.03% / 7.44%
||
7 Day CHG~0.00%
Published-03 Oct, 2025 | 14:39
Updated-19 Dec, 2025 | 07:57
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Use-after-free vulnerability in Qt SVG qsvghandler.cpp allows denial of service via crafted SVG

The module will parse a <pattern> node which is not a child of a structural node. The node will be deleted after creation but might be accessed later leading to a use after free.

Action-Not Available
Vendor-The Qt Company
Product-Qt
CWE ID-CWE-416
Use After Free
Details not found