https://reddit.com/r/netsec/comments/1uab0j6/useafterfree_in_the_qpack_encoder_of_nginx_http3/: Use-after-free in the QPACK encoder of nginx HTTP/3 - CVE-2026-42530
Published Jun 19, 2026
·Updated
Affected Software
1 affected component
Nginx nginx (HTTP/3)
Frequently Asked Questions
1
What is the severity of CVE-2026-42530?
CVE-2026-42530 is considered a critical vulnerability due to its potential to allow remote code execution.
2
How do I fix CVE-2026-42530?
To fix CVE-2026-42530, upgrade your Nginx installation to the latest version that addresses this vulnerability.
3
What type of vulnerability is CVE-2026-42530?
CVE-2026-42530 is a use-after-free vulnerability that affects the QPACK encoder in Nginx's HTTP/3 implementation.
4
What systems are affected by CVE-2026-42530?
CVE-2026-42530 affects Nginx servers configured to support the HTTP/3 protocol.
5
Is there a workaround for CVE-2026-42530 until I can update?
While there is no official workaround, disabling HTTP/3 support may mitigate the risk associated with CVE-2026-42530.