Dashboard / CVE-2026-15565

CVE-2026-15565

HIGH
MEDIUM Priority: 0.08 BB Relevance: 75/100
Published: 2026-08-11 Modified: 2026-11-01 First seen: 2026-11-01 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: None
I: None
A: High

Description

A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class that has any @OnMessage method. This allows an attacker to cause Denial of Service attack without authentication and using only a standard WebSocket handshake.

Weakness Classification (1)

References & Advisories (8)

https://access.redhat.com/errata/RHSA-2026:53644
vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:53806
vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:70228
vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:70229
vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:70230
vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:70277
vendor-advisory x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2490628
issue-tracking x_refsource_REDHAT

Bug Bounty Relevance

75 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

1.02%
Raw Score 0.010170
Percentile 63.8%
Date 2026-11-13

EPSS Trend

2026-11-13
0.01017
2026-11-12
0.01017
2026-11-10
0.01017
2026-11-09
0.01017
2026-11-08
0.01017
2026-11-07
0.01017
2026-11-06
0.01017
2026-11-05
0.01017
2026-11-04
0.01017
2026-11-03
0.01017
2026-11-02
0.01017
2026-11-01
0.01017
2026-10-31
0.01156

Intelligence Sources

mitre ref →
nvd ref →

External Links