CVE-2026-73551

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Source
https://cve.org/CVERecord?id=CVE-2026-73551
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73551.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-73551
Aliases
  • GHSA-2w8w-rfw7-8gg4
Downstream
Related
Published
2026-09-21T20:17:02Z
Modified
2026-09-23T08:15:52Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
Envoy: Path normalization does not handle dot and dotdot segments with parameters
Details

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's URL normalization does not recognize dot and dotdot path segments when they carry semicolon parameters. A request such as /user/..;foo=bar/admin is therefore not canonicalized to /admin even when path normalization is enabled. If an upstream interprets the segment according to RFC 3986 while Envoy applies routing or RBAC to the uncollapsed path, a remote client can cause path confusion and bypass path-based security policy. The relevant scope boundary is that the security consequence depends on a downstream/upstream path interpretation mismatch or a path-based Envoy decision. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-647"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73551.json"
}
References

Affected packages

Git / github.com/envoyproxy/envoy

Affected ranges

Type
GIT
Repo
https://github.com/envoyproxy/envoy
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Introduced
6d9bb7d9a85d616b220d1f8fe67b61f82bbdb8d3
Introduced
f1dd21b16c244bda00edfb5ffce577e12d0d2ec2
Introduced
8eea3285d6bdb89f8ea34632cfe7ce1608a8f374
Fixed
053a8989382dd91542ecf0cef8f379b9cb761cdd
Fixed
cf413bdb37b36d3ffbe570b8a48760abe2b588f5
Fixed
ef2d997c1b022cf8b849a1d3521fbf234d79ca26
Fixed
b579d07d3ad7ee11d32b105e91a5a39ad24718d7
Fixed
28b6d60a6d96edeece121cac5be701eb46cc7f24
Fixed
d40a68b0a30a003c4e0a9fd3af637f828b52c37b
Fixed
e9d6c329f9a3ff19432bf39b60c601df7e3eda33
Fixed
f74d1107c4f5c9679b66f7a03a6c5b75ddde1989
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "1.36.10"
        },
        {
            "introduced":  "1.37.0"
        },
        {
            "fixed":  "1.37.6"
        },
        {
            "introduced":  "1.38.0"
        },
        {
            "fixed":  "1.38.4"
        },
        {
            "introduced":  "1.39.0"
        },
        {
            "fixed":  "1.39.1"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v1.*
v1.0.0
v1.1.0
v1.10.0
v1.11.0
v1.12.0
v1.13.0
v1.14.0
v1.15.0
v1.16.0
v1.17.0
v1.18.0
v1.18.1
v1.18.2
v1.19.0
v1.2.0
v1.20.0
v1.21.0
v1.22.0
v1.23.0
v1.24.0
v1.25.0
v1.26.0
v1.27.0
v1.28.0
v1.29.0
v1.3.0
v1.30.0
v1.31.0
v1.32.0
v1.33.0
v1.34.0
v1.35.0
v1.36.0
v1.36.1
v1.36.2
v1.36.3
v1.36.4
v1.36.5
v1.36.6
v1.36.7
v1.36.8
v1.36.9
v1.37.0
v1.37.1
v1.37.2
v1.37.3
v1.37.4
v1.37.5
v1.38.0
v1.38.1
v1.38.2
v1.38.3
v1.39.0
v1.4.0
v1.5.0
v1.6.0
v1.7.0
v1.8.0
v1.9.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73551.json"
vanir_signatures 
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vanir_signatures_modified 
"2026-09-23T08:15:52Z"