CVE-2026-40303

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Source
https://cve.org/CVERecord?id=CVE-2026-40303
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40303.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-40303
Aliases
Published
2026-04-17T21:01:51.899Z
Modified
2026-07-08T08:15:15.368885717Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
zrok allows unauthenticated DoS via unbounded memory allocation in striped session cookie parsing
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40303.json",
    "cwe_ids": [
        "CWE-400",
        "CWE-789"
    ],
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/openziti/zrok

Affected ranges

Type
GIT
Repo
https://github.com/openziti/zrok
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
69b9b8dd6d96be15639338414574aa5003f5f8f2
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:netfoundry:zrok:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.0.1"
        }
    ]
}

Affected versions

v0.*
v0.2.0
v0.2.0.1
v0.2.0.2
v0.2.0.3
v0.2.0.4
v0.2.1
v0.2.10
v0.2.11
v0.2.12
v0.2.13
v0.2.14
v0.2.15
v0.2.16
v0.2.17
v0.2.18
v0.2.2
v0.2.3
v0.2.4
v0.2.5
v0.2.6
v0.2.7
v0.2.8
v0.2.9
v0.3.0
v0.3.0-rc1
v0.3.0-rc2
v0.3.0-rc3
v0.3.0-rc4
v0.3.0-rc5
v0.3.0-rc6
v0.3.1
v0.3.2
v0.3.4
v0.3.5
v0.3.5-rc1
v0.3.6
v0.4.0
v0.4.10
v0.4.11
v0.4.12
v0.4.13
v0.4.14
v0.4.15
v0.4.16
v0.4.17
v0.4.18
v0.4.19
v0.4.2
v0.4.20
v0.4.21
v0.4.22
v0.4.23
v0.4.24
v0.4.25
v0.4.26
v0.4.27
v0.4.28
v0.4.29
v0.4.3
v0.4.30
v0.4.31
v0.4.32
v0.4.33
v0.4.34
v0.4.35
v0.4.36
v0.4.37
v0.4.38
v0.4.39
v0.4.4
v0.4.40
v0.4.41
v0.4.42
v0.4.43
v0.4.44
v0.4.45
v0.4.46
v0.4.47
v0.4.48
v0.4.49
v0.4.5
v0.4.6
v0.4.7
v0.4.8
v0.4.9
v1.*
v1.0.0
v1.0.1
v1.0.2
v1.0.3
v1.0.4
v1.0.5
v1.0.6
v1.0.7
v1.0.8
v1.1.0
v1.1.1
v1.1.10
v1.1.11
v1.1.2
v1.1.3
v1.1.4
v1.1.5
v1.1.6
v1.1.7
v1.1.8
v2.*
v2.0.0
v2.0.0-rc5
v2.0.0-rc6
v2.0.0-rc7
v2.0.0-rc8
v2.0.0-rc9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40303.json"