CVE-2025-5991CWE-416

Use after free in QHttp2ProtocolHandler

Low · published June 11, 2025

CVSS v4.0
2.1
EPSS
0%
Percentile
2.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
2.1 · 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
EPSS
0.00136 · 2.7th percentile
Weakness
CWE-416 · Use After Free
Published
2025-06-11T07:33Z
EPSS history
Timeline
  • 11 JUN 07:33Z
    Use after free in QHttp2ProtocolHandler
    cvelistv5