Vulnerability Details CVE-2026-40303
zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, endpoints.GetSessionCookie parses an attacker-supplied cookie chunk count and calls make([]string, count) with no upper bound before any token validation occurs. The function is reached on every request to an OAuth-protected proxy share, allowing an unauthenticated remote attacker to trigger gigabyte-scale heap allocations per request, leading to process-level OOM termination or repeated goroutine panics. Both publicProxy and dynamicProxy are affected. Version 2.0.1 patches the issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.3%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-40303
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cpe:2.3:a:netfoundry:zrok:0.2.0
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cpe:2.3:a:netfoundry:zrok:0.2.0.1
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cpe:2.3:a:netfoundry:zrok:0.2.0.2
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cpe:2.3:a:netfoundry:zrok:0.2.0.3
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cpe:2.3:a:netfoundry:zrok:0.2.0.4
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cpe:2.3:a:netfoundry:zrok:0.2.1
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cpe:2.3:a:netfoundry:zrok:0.2.10
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cpe:2.3:a:netfoundry:zrok:0.2.11
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cpe:2.3:a:netfoundry:zrok:0.2.12
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cpe:2.3:a:netfoundry:zrok:0.2.13
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cpe:2.3:a:netfoundry:zrok:0.2.14
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cpe:2.3:a:netfoundry:zrok:0.2.15
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cpe:2.3:a:netfoundry:zrok:0.2.16
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cpe:2.3:a:netfoundry:zrok:0.2.17
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cpe:2.3:a:netfoundry:zrok:0.2.18
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cpe:2.3:a:netfoundry:zrok:0.2.2
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cpe:2.3:a:netfoundry:zrok:0.2.3
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cpe:2.3:a:netfoundry:zrok:0.2.4
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cpe:2.3:a:netfoundry:zrok:0.2.5
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cpe:2.3:a:netfoundry:zrok:0.2.6
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cpe:2.3:a:netfoundry:zrok:0.2.7
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cpe:2.3:a:netfoundry:zrok:0.2.8
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cpe:2.3:a:netfoundry:zrok:0.2.9
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cpe:2.3:a:netfoundry:zrok:0.3.0
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cpe:2.3:a:netfoundry:zrok:0.3.1
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cpe:2.3:a:netfoundry:zrok:0.3.2
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cpe:2.3:a:netfoundry:zrok:0.3.4
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cpe:2.3:a:netfoundry:zrok:0.3.5
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cpe:2.3:a:netfoundry:zrok:0.3.6
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cpe:2.3:a:netfoundry:zrok:0.4.0
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cpe:2.3:a:netfoundry:zrok:0.4.1
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cpe:2.3:a:netfoundry:zrok:0.4.10
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cpe:2.3:a:netfoundry:zrok:0.4.11
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cpe:2.3:a:netfoundry:zrok:0.4.12
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cpe:2.3:a:netfoundry:zrok:0.4.13
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cpe:2.3:a:netfoundry:zrok:0.4.14
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cpe:2.3:a:netfoundry:zrok:0.4.15
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cpe:2.3:a:netfoundry:zrok:0.4.16
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cpe:2.3:a:netfoundry:zrok:0.4.17
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cpe:2.3:a:netfoundry:zrok:0.4.18
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cpe:2.3:a:netfoundry:zrok:0.4.19
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cpe:2.3:a:netfoundry:zrok:0.4.2
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cpe:2.3:a:netfoundry:zrok:0.4.20
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cpe:2.3:a:netfoundry:zrok:0.4.21
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cpe:2.3:a:netfoundry:zrok:0.4.22
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cpe:2.3:a:netfoundry:zrok:0.4.23
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cpe:2.3:a:netfoundry:zrok:0.4.24
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cpe:2.3:a:netfoundry:zrok:0.4.25
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cpe:2.3:a:netfoundry:zrok:0.4.26
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cpe:2.3:a:netfoundry:zrok:0.4.27
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cpe:2.3:a:netfoundry:zrok:0.4.28
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cpe:2.3:a:netfoundry:zrok:0.4.29
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cpe:2.3:a:netfoundry:zrok:0.4.3
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cpe:2.3:a:netfoundry:zrok:0.4.30
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cpe:2.3:a:netfoundry:zrok:0.4.31
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cpe:2.3:a:netfoundry:zrok:0.4.32
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cpe:2.3:a:netfoundry:zrok:0.4.33
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cpe:2.3:a:netfoundry:zrok:0.4.34
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cpe:2.3:a:netfoundry:zrok:0.4.35
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cpe:2.3:a:netfoundry:zrok:0.4.36
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cpe:2.3:a:netfoundry:zrok:0.4.37
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cpe:2.3:a:netfoundry:zrok:0.4.38
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cpe:2.3:a:netfoundry:zrok:0.4.39
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cpe:2.3:a:netfoundry:zrok:0.4.4
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cpe:2.3:a:netfoundry:zrok:0.4.40
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cpe:2.3:a:netfoundry:zrok:0.4.41
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cpe:2.3:a:netfoundry:zrok:0.4.42
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cpe:2.3:a:netfoundry:zrok:0.4.43
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cpe:2.3:a:netfoundry:zrok:0.4.44
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cpe:2.3:a:netfoundry:zrok:0.4.45
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cpe:2.3:a:netfoundry:zrok:0.4.46
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cpe:2.3:a:netfoundry:zrok:0.4.47
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cpe:2.3:a:netfoundry:zrok:0.4.48
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cpe:2.3:a:netfoundry:zrok:0.4.49
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cpe:2.3:a:netfoundry:zrok:0.4.5
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cpe:2.3:a:netfoundry:zrok:0.4.6
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cpe:2.3:a:netfoundry:zrok:0.4.7
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cpe:2.3:a:netfoundry:zrok:0.4.8
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cpe:2.3:a:netfoundry:zrok:0.4.9
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cpe:2.3:a:netfoundry:zrok:1.0.0
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cpe:2.3:a:netfoundry:zrok:1.0.1
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cpe:2.3:a:netfoundry:zrok:1.0.2
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cpe:2.3:a:netfoundry:zrok:1.0.3
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cpe:2.3:a:netfoundry:zrok:1.0.4
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cpe:2.3:a:netfoundry:zrok:1.0.5
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cpe:2.3:a:netfoundry:zrok:1.0.6
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cpe:2.3:a:netfoundry:zrok:1.0.7
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cpe:2.3:a:netfoundry:zrok:1.0.8
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cpe:2.3:a:netfoundry:zrok:1.1.0
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cpe:2.3:a:netfoundry:zrok:1.1.1
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cpe:2.3:a:netfoundry:zrok:1.1.10
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cpe:2.3:a:netfoundry:zrok:1.1.11
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cpe:2.3:a:netfoundry:zrok:1.1.2
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cpe:2.3:a:netfoundry:zrok:1.1.3
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cpe:2.3:a:netfoundry:zrok:1.1.4
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cpe:2.3:a:netfoundry:zrok:1.1.5
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cpe:2.3:a:netfoundry:zrok:1.1.6
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cpe:2.3:a:netfoundry:zrok:1.1.7
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cpe:2.3:a:netfoundry:zrok:1.1.8
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cpe:2.3:a:netfoundry:zrok:1.1.9
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cpe:2.3:a:netfoundry:zrok:2.0.0