CVE-2026-78663 Affecting golang-1.24 package, versions *


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.57% (46th percentile)

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  • Snyk IDSNYK-ECHOLATEST-GOLANG124-20675113
  • published9 Oct 2026
  • disclosed8 Oct 2026

Introduced: 8 Oct 2026

NewCVE-2026-78663  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest golang-1.24.

NVD Description

Note: Versions mentioned in the description apply only to the upstream golang-1.24 package and not the golang-1.24 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered data. A malicious client can exploit this to bypass the configured connection-level flow control limit (MaxReceiveBufferPerConnection). Total buffered data is still limited by the concurrent stream limit and stream-level flow control.

CVSS Base Scores

version 3.1