Envoy: Path normalization does not handle dot and dotdot segments with parameters
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.
CVE-2026-73551
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-73551
envoy
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "envoyproxy",
"product": "envoy",
"versions": [
{
"status": "affected",
"version": "< 1.36.10"
},
{
"status": "affected",
"version": ">= 1.37.0, < 1.37.6"
},
{
"status": "affected",
"version": ">= 1.38.0, < 1.38.4"
},
{
"status": "affected",
"version": ">= 1.39.0, < 1.39.1"
}
]
}
]- Related CVEs
- CVE-2026-73551
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #3341 · Revision 1
- Added to Heist Feed
- Publisher date