# CVE-2026-95620: Use-after-free vulnerability in QNetworkAccessManager HTTP/2 support impacts Qt

Status: published. Published: 2026-10-23. Updated: 2026-11-02.

A use-after-free vulnerability in the Qt QNetworkAccessManager HTTP/2 client support of the Qt Network module allows a malicious or compromised HTTP/2 server to cause the client application to crash, affecting availability.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: Qt) — https://codereview.qt-project.org/c/qt/qtbase/+/759717

## Affected products and versions

- qt / qt: ≥ 0; < 6.9.0 (unknown, python); ≥ 6.9.0; < 6.11.3 (affected, python). Source: CNA: Qt

## Severity and prioritization

- CVSS 4.0: 2.1 (low); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/AU:N/R:U/RE:L/U:Green; source: CNA: Qt

- CVSS 4.0: 2.1 (low); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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:N/R:U/V:X/RE:L/U:Green; source: NVD: a59d8014-47c4-4630-ab43-e1b13cbe58e3

- CISA KEV: No listing in collected sources

- EPSS: 0.23% as of 2026-11-02; percentile 13.71%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-416

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-95620: (CNA: Qt; vendor-advisory)

- https://codereview.qt-project.org/c/qt/qtbase/+/759717 (CNA: Qt; patch)

- https://codereview.qt-project.org/c/qt/qtbase/+/759717 (a59d8014-47c4-4630-ab43-e1b13cbe58e3)

- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-95620: (a59d8014-47c4-4630-ab43-e1b13cbe58e3)

## Provenance

- CNA: Qt: https://www.cve.org/CVERecord?id=CVE-2026-95620; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-95620; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-95620; retrieved 2026-11-02; source updated Not reported

Revision: 973aa511ed88df6efdc740ba13bc284462ac1d5963591493af35407b7e4d34f3

Canonical: https://y2.dev/cve/CVE-2026-95620

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