CVE-2026-5680

Impact

A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application.

Affected packages

This record carries no package version data, so it cannot be matched against a dependency list automatically. Read the advisory and compare your version by hand.

Weakness classification

References

• NVD record
• CVE.org record
• https://access.redhat.com/errata/RHSA-2026:70228
• https://access.redhat.com/errata/RHSA-2026:70229
• https://access.redhat.com/errata/RHSA-2026:70230
• https://access.redhat.com/errata/RHSA-2026:70277
• https://access.redhat.com/security/cve/CVE-2026-5680
• https://bugzilla.redhat.com/show_bug.cgi?id=2455350