EUVD-2025-18092
CVSS 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
Lifecycle Timeline
4Description
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.
Analysis
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.
Technical Context
A use-after-free vulnerability occurs when a program continues to use a pointer after the referenced memory has been freed, leading to undefined behavior. This vulnerability is classified as Use After Free (CWE-416).
Affected Products
Affected: Qt 6
Remediation
Use memory-safe languages. Implement proper object lifecycle management. Use static and dynamic analysis tools to detect UAF patterns.
Priority Score
Vendor Status
Ubuntu
Priority: Medium| Release | Status | Version |
|---|---|---|
| jammy | needs-triage | - |
| noble | needs-triage | - |
| upstream | needs-triage | - |
| oracular | ignored | end of life, was needs-triage |
| questing | needs-triage | - |
| plucky | ignored | end of life, was needs-triage |
| Release | Status | Version |
|---|---|---|
| xenial | needs-triage | - |
| focal | needs-triage | - |
| jammy | needs-triage | - |
| noble | needs-triage | - |
| upstream | needs-triage | - |
| oracular | ignored | end of life, was needs-triage |
| questing | needs-triage | - |
| plucky | ignored | end of life, was needs-triage |
| Release | Status | Version |
|---|---|---|
| oracular | ignored | end of life, was needs-triage |
| upstream | released | 6.9.1 |
| focal | not-affected | code not present |
| bionic | not-affected | code not present |
| jammy | not-affected | code not present |
| noble | not-affected | code not present |
| plucky | not-affected | code not present |
| questing | not-affected | code not present |
| xenial | not-affected | code not present |
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bookworm | fixed | 6.4.2+dfsg-10 | - |
| trixie | fixed | 6.8.2+dfsg-9+deb13u1 | - |
| forky, sid | fixed | 6.9.2+dfsg-4 | - |
| (unstable) | not-affected | - | - |
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | fixed | 5.15.2+dfsg-9+deb11u1 | - |
| bullseye (security) | fixed | 5.15.2+dfsg-9+deb11u2 | - |
| bookworm | fixed | 5.15.8+dfsg-11+deb12u3 | - |
| trixie | fixed | 5.15.15+dfsg-6+deb13u1 | - |
| forky, sid | fixed | 5.15.17+dfsg-7 | - |
| (unstable) | not-affected | - | - |
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | fixed | 5.15.2+dfsg-4 | - |
| bookworm | fixed | 5.15.8+dfsg-3 | - |
| trixie | fixed | 5.15.15+dfsg-2 | - |
| forky, sid | fixed | 5.15.17+dfsg-2 | - |
| (unstable) | not-affected | - | - |
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External POC / Exploit Code
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