High [CVE-2026-14456] Denial of Service via unbounded memory growth in QUIC server
This high-severity Red Hat Linux advisory covers CVE-2026-14456 affecting Red Hat Developer Hub, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9.
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
Summary
A flaw was found in OpenSSL. A remote attacker could exploit this by sending a large number of QUIC Initial packets to an OpenSSL QUIC server.
This can cause the server to allocate and queue new incoming channels without limit, leading to unbounded memory growth. The excessive memory consumption can result in a Denial of Service (DoS) condition, making the QUIC listener unavailable.
Red Hat Enterprise Linux 9.8+, 10.2+, Hummingbird 1, RHIVOS 2, and OpenShift 4.22 ship OpenSSL 3.5.x which includes the QUIC server implementation affected by this flaw. Earlier RHEL versions ship OpenSSL 3.2.x or below, which do not include the QUIC server feature and are not affected.
The FIPS module is not affected as the QUIC implementation is outside the OpenSSL FIPS module boundary. Applications must explicitly enable the QUIC server listener to be vulnerable; simply having OpenSSL 3.5 installed does not expose the flaw.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.
Affected Red Hat products: Red Hat Developer Hub; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat Enterprise Linux 8 as not affected.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: openssl.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Rate-limit or firewall inbound QUIC (UDP 443) traffic at the network level to reduce exposure. If QUIC server functionality is not required, disable it and use TLS over TCP instead. The upstream fix introduces a default limit of 256 pending connections, configurable via SSL_set_value_uint(3ossl).
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.