HIGH

CVE-2026-15565

2026-08-11 CVSS v3.1

CVSS

7.5

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 (CWE)

CWE-120 Classic Buffer Overflow

EPSS Score

0.51%

Probability of exploitation in next 30 days

42.4th percentile

References

https://access.redhat.com/errata/RHSA-2026:53644 https://access.redhat.com/errata/RHSA-2026:53645 https://access.redhat.com/errata/RHSA-2026:53646 https://access.redhat.com/errata/RHSA-2026:53806 https://access.redhat.com/security/cve/CVE-2026-15565 https://bugzilla.redhat.com/show_bug.cgi?id=2490628

View on dbcve.org

Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.

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