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CVE-2026-73511Disclosure(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 normally matches the raw request path, while servlet backends such as Apache Tomcat strip semicolon matrix parameters from each path segment before resolving the resource. Envoy's ignore_path_parameters_in_path_matching option instead truncates at the first semicolon and still does not match per-segment backend behavior. A remote client can use a parameterized protected segment, or a parameter on an earlier segment, to make Envoy select an unprotected fallback while the backend resolves the protected resource. The relevant scope boundary is that the bypass requires both a path-based Envoy decision and a backend that strips semicolon parameters per segment. 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
Exploit / PoC references
Other references
Weakness type (CWE)
CWE-289CWE-436

Priority

LOW

Exploitation

NONE

PoC

YES

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 · 2026-10-07: 1Patch / Workaround · 2026-10-07: 1Technical Details · 2026-09-22: 1Technical Details · 2026-10-07: 109-2210-07
Signal classification2 categories
Disclosure
150.0%
Patch
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-09-221
Disclosure1
2026-10-071
Patch1
Full discourse2 posts
  • Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters
    Patch

    CVE-2026-73511: Envoy path-matching flaw lets crafted matrix params bypass routing to servlet backends like Tomcat. CVSS 5.3. Fixed in 1.36.10, 1.37.6, 1.38.4, 1.39.1. Patch now. https://www.valtersit.com/cve/CVE-2026-73511 #CVE #infosec #Envoy #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 reports CVE-2026-73511 as an Envoy path-matching flaw with CVSS 5.3 and lists fixed versions while advising to patch now, but it does not mention a PoC, exploit tool, or active exploitation.

    1001055
    1.0K 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

    The text announces multiple new CVEs with technical descriptions of their mechanisms but provides no patches, exploits, or active exploitation claims, functioning as a vulnerability disclosure report.

    0000047
    6 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appenvoyproxyenvoy---

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