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CVE Record

CVE-2026-22771: Envoy Extension Policy lua scripts injection causes arbitrary command execution

Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. Prior to 1.5.7 and 1.6.2, EnvoyExtensionPolicy Lua scripts executed by Envoy proxy can be used to leak the proxy's credentials. These credentials can then be used to communicate with the control plane and gain access to all secrets that are used by Envoy proxy, e.g. TLS private keys and credentials used for downstream and upstream communication. This vulnerability is fixed in 1.5.7 and 1.6.2.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Envoy Gateway versions before 1.5.7 and 1.6.2 can let a lower-privileged attacker abuse Lua extension policy scripts to expose proxy credentials. Those credentials may allow access to the control plane and secrets used by Envoy, including TLS private keys. This is a high-impact issue for environments using Envoy Gateway extension policies.

Executive priority

Prioritize remediation for production gateways, internet-facing gateways, and clusters where many services depend on Envoy-managed TLS or upstream credentials. The issue can affect confidentiality of private keys and credentials, so delayed patching may expand incident blast radius.

Technical view

CVE-2026-22771 affects envoyproxy/gateway <1.5.7 and >=1.6.0-rc.0,<1.6.2. EnvoyExtensionPolicy Lua scripts executed by Envoy proxy can leak proxy credentials. The advisory maps this to CWE-94 and CVSS 8.8, with network attack vector, low complexity, low privileges required, and high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is most likely in Kubernetes or standalone Envoy Gateway deployments running affected versions and using or allowing EnvoyExtensionPolicy Lua scripts. Systems not running Envoy Gateway, or already on 1.5.7 or 1.6.2, are not indicated as affected by the provided sources.

Exploitation context

The CVSS vector indicates network reachability, low attack complexity, and low privileges required. The provided sources do not state public exploitation, and the CVE is not marked as CISA KEV. The main risk is credential leakage leading to control plane access and exposure of Envoy-used secrets.

Researcher notes

The public description provides impact and fixed versions but limited operational detail. Avoid assuming arbitrary command execution beyond the stated credential leakage path. Validate exposure through version and EnvoyExtensionPolicy usage. No source in the bundle confirms active exploitation or provides a broader affected product list.

Mitigation direction

  • Upgrade Envoy Gateway to 1.5.7 or 1.6.2, per the advisory.
  • Identify and restrict who can create or modify EnvoyExtensionPolicy resources.
  • Review vendor guidance from Envoy and downstream distributors such as Red Hat.
  • Treat exposed proxy credentials and Envoy-used secrets as potentially compromised if exploitation is suspected.

Validation and detection

  • Inventory Envoy Gateway deployments and record exact versions.
  • Check for versions below 1.5.7 or 1.6.0-rc.0 through below 1.6.2.
  • Review clusters for EnvoyExtensionPolicy usage with Lua scripts.
  • Confirm upgraded deployments report version 1.5.7, 1.6.2, or later.
  • Review logs and secret access history for unusual control plane activity.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-94: Code execution behavior lookup

Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-22771 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9GitHub_M
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2026-22771Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPenvoyproxy/gateway: Envoy Gateway: Unauthorized access to secrets via Lua script credential leakage
other:Red Hat severity ratingcvssV3_1
  • 2026-01-12T19:01:29.001Z: Reported to Red Hat.
  • 2026-01-12T18:08:22.532Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
envoyproxygateway< 1.5.7, >= 1.6.0-rc.0, < 1.6.2Listed
Weakness

CWE details

CWE-94

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-94 · source CWE mapping

Improper Control of Generation of Code ('Code Injection')

Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs