CVE-2026-40211
Denial of service via crafted DoH3 queries
Description
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.
INFO
Published Date :
June 25, 2026, 12:23 p.m.
Last Modified :
June 25, 2026, 12:23 p.m.
Remotely Exploit :
Yes !
Source :
OX
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 8ce71d90-2354-404b-a86e-bec2cc4e6981 | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the affected software to the latest version.
- Apply vendor patches for buffer handling.
- Monitor memory usage on critical systems.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40211 vulnerability anywhere in the article.