CVE-2026-93564

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:69440
https://access.redhat.com/errata/RHSA-2026:69470
https://access.redhat.com/errata/RHSA-2026:70257
https://access.redhat.com/errata/RHSA-2026:83612
https://access.redhat.com/security/cve/CVE-2026-93564
https://bugzilla.redhat.com/show_bug.cgi?id=2536953

Configurations

No configuration.

History

15 Oct 2026, 17:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:83612 -

22 Sep 2026, 17:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:69440 - () https://access.redhat.com/errata/RHSA-2026:70257 -

21 Sep 2026, 17:19

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:69470 -

18 Sep 2026, 21:18

Type	Values Removed	Values Added
Summary	~~(en) HAProxy PROXY-v2 nested-TLV grandchild ByteBuf reference-count leak (incomplete fix of PR #16881)~~	(en) 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.

18 Sep 2026, 15:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-18 15:17

Updated : 2026-10-15 17:17

NVD link : CVE-2026-93564

Mitre link : CVE-2026-93564

CVE.ORG link : CVE-2026-93564

JSON object : View

Products Affected

No product.

CWE

CWE-1035

OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities

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