Bug 2515839 (CVE-2026-56862) - CVE-2026-56862 crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages
Summary: CVE-2026-56862 crypto/tls: golang: Golang crypto/tls: Denial of Service via i...
Keywords:
Status: NEW
Alias: CVE-2026-56862
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-13 22:25 UTC by OSIDB Bzimport
Modified: 2026-08-21 18:13 UTC (History)
140 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-13 22:25:13 UTC 
Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.
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