CVE-2026-93564

CVE-2026-93564

High · published September 18, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
60.6
In the wild
Unconfirmed
What it is

A flaw was found in Netty. A reference-count leak in the HAProxy PROXY-v2 message decoder allows a remote, unauthenticated attacker to send specially crafted PROXY-protocol v2 headers. This can lead to memory exhaustion, resulting in a Denial of Service (DoS) for the affected system.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00939 · 60.6th percentile
Published
2026-09-18T19:17Z
References (6)
https://access.redhat.com/errata/RHSA-2026:69440 · [email protected]https://access.redhat.com/errata/RHSA-2026:69470 · [email protected]https://access.redhat.com/errata/RHSA-2026:70257 · [email protected]https://access.redhat.com/errata/RHSA-2026:83612 · [email protected]https://access.redhat.com/security/cve/CVE-2026-93564 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2536953 · [email protected]
EPSS history
Timeline
  • 20 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 18 SEP 14:13Z
    Io.netty/netty-codec-haproxy: netty: haproxy proxy-v2 nested-tlv grandchild bytebuf reference-count leak (incomplete fix of pr #16881)
    cvelistv5