CVE-2026-40211
Medium · 5.3CVSS
5.3
EPSS
0.7%
Published
Jun 25, 2026
CISA due date
—
The record
An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memory condition, resulting in a denial of service.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
Related vulnerabilities
- CVE-2026-114731 Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an uncontrolled… CWE-770
- CVE-2026-96377 Allocation of Resources Without Limits or Throttling vulnerability in Drupal Combined… CWE-770
- CVE-2026-96365 Allocation of Resources Without Limits or Throttling vulnerability in Drupal Webform… CWE-770
- CVE-2026-114723 Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 allows the ImageMagick resource… CWE-770
- CVE-2026-113811 Algorithm::UrataniTakeda versions from 0.1.5 before 0.1.7 for Perl allow memory… CWE-770
- CVE-2026-113795 pypdf is a free and open-source pure-python PDF library. CWE-770
- CVE-2026-112400 Pillow is a Python imaging library. CWE-770
- CVE-2026-111064 AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. CWE-770