VulnSocial

CVE-2026-73551Disclosure(envoyproxy / envoy)

LOWCVSS 5.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch envoyproxy envoy systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

envoyproxy CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Patch / fix
Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-647

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • envoy

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-09-22); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
envoyproxy
Products
envoy

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-09-22: 1Mentions · 2026-10-09: 1Patch / Workaround · 2026-10-09: 1Technical Details · 2026-09-22: 1Technical Details · 2026-10-09: 109-2210-09
Signal classification2 categories
Disclosure
150.0%
Patch
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-09-221
Disclosure1
2026-10-091
Patch1
Full discourse2 posts
  • Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters
    Patch

    CVE-2026-73551 Envoy path normalization bypass lets /user/..;foo=bar/admin reach /admin uncanonicalized. CVSS 5.3. Patch to 1.36.10, 1.37.6, 1.38.4 or 1.39.1 now. https://www.valtersit.com/cve/CVE-2026-73551/ #Envoy #infosec #CVE #Envoy #CVEALERT #CVE #infosec #Linux #XSS #valtersit #snippet #SysAdmin #cybersecurity #devsecops #devops #developer #100daysofcode #git #github #gitlab #redteam #blueteam #ethicalhacker #cybersecurityawareness #cybersecuritynews #cybersecuritytips #python #hacker #kali #ubuntu #debian #docker

    Post summary

    The text describes an Envoy path normalization bypass and provides affected-version upgrade targets. Its primary takeaway is the explicit instruction to patch to a listed fixed version.

    0000034
    1.1K followersView on X
  • NewNormal Security@NewScanTeam
    Disclosure

    NewNormal Security turns CVEs since the previous batch into new detections, every day. 𝗗𝗮𝗶𝗹𝘆 𝗖𝗩𝗘 𝗥𝗲𝗽𝗼𝗿𝘁 — 22 Sep 2026 𝗔𝗱𝗱𝗲𝗱 to NewScan 𝘁𝗼𝗱𝗮𝘆: ✂️ Edge proxy path confusion and upgrade tunnelling — smuggle a request past the proxy's own access control (Envoy CVE-2026-73548, CVE-2026-73552, CVE-2026-73553, CVE-2026-73511, CVE-2026-73551) 🖥️ Service mesh proxy admin console reachable with no password — dump upstreams, listeners and the TLS material they reference (Envoy CVE-2026-73546) 📦 Network monitoring appliance on an unpatched build — read its stored config backups, or run commands on the box that sees every flow (ntop ntopng CVE-2026-84990, CVE-2026-82412) Test your stack with NewScan — free, self-hosted: https://newnormalsecurity.com/newscan?utm_source=x&utm_medium=social&utm_campaign=daily-cve #infosec #AppSec #RequestSmuggling #CSO #REDTEAM

    Post summary

    Announces new CVE detections in NewScan, briefly describing vulnerabilities (proxy path confusion, admin console weak auth, network‑monitoring appliance exposure) without PoC, exploits, patches, or evidence of active exploitation.

    0000047
    6 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appenvoyproxyenvoy---

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