NULL Pointer Dereference Affecting github.com/envoyproxy/envoy/contrib/golang/upstreams/http/tcp/source/go/pkg/upstreams/http/tcp package, versions <1.33.11>=1.34.0 <1.34.9>=1.35.0 <1.35.5>=1.36.0 <1.36.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMENVOYPROXYENVOYCONTRIBGOLANGUPSTREAMSHTTPTCPSOURCEGOPKGUPSTREAMSHTTPTCP-13638673
- published20 Oct 2025
- disclosed16 Oct 2025
- creditbotengyao, Kuo-Chung Hsu
Introduced: 16 Oct 2025
NewCVE-2025-62409 Â (opens in a new tab)How to fix?
Upgrade github.com/envoyproxy/envoy/contrib/golang/upstreams/http/tcp/source/go/pkg/upstreams/http/tcp to version 1.33.11, 1.34.9, 1.35.5, 1.36.1 or higher.
Overview
Affected versions of this package are vulnerable to NULL Pointer Dereference in the flow control management process while overriding onAboveWriteBufferHighWatermark and onBelowWriteBufferLowWatermark callbacks. An attacker can cause a crash of the TCP connection pool by sending large requests or responses when the connection is closing but upstream data is still being received, resulting in a null pointer dereference in the buffer watermark callback. This can impact both TCP proxy and mixed HTTP/1 and HTTP/2 use cases based on ALPN.