CVE-2026-78663 Affecting ollama package, versions <0.40.2-r1


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-WOLFILATEST-OLLAMA-20752311
  • published10 Oct 2026
  • disclosed8 Oct 2026

Introduced: 8 Oct 2026

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

How to fix?

Upgrade Wolfi ollama to version 0.40.2-r1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ollama package and not the ollama package as distributed by Wolfi. See How to fix? for Wolfi 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