Security Resilience

CVE-2026-48042

Envoyproxy Envoy 1.18.0 – 1.35.13

Public PoC
Published
26 June 2026
Modified
29 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0056 45th percentile
Risk Priority 58 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-48042 is a high-severity Excessively Deep Nesting (CWE-1124) vulnerability in Envoyproxy Envoy. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked at the 45th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SA-15 (Development Process, Standards, and Tools) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, destructor of JSON Object results in stack overflow when deeply O(100K) nested objects are present. This vulnerability is fixed in…

more

1.35.11, 1.36.7, 1.37.3, and 1.38.1.

CWE(s)
CWE-1124

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001.001 Junk Data Command And Control
Adversaries may add junk data to protocols used for command and control to make detection more difficult.
attack.mitre.org →
T1001.003 Protocol or Service Impersonation Command And Control
Adversaries may impersonate legitimate protocols or web service traffic to disguise command and control activity and thwart analysis efforts.
attack.mitre.org →
T1003.001 LSASS Memory Credential Access
Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).
attack.mitre.org →
T1003.003 NTDS Credential Access
Adversaries may attempt to access or create a copy of the Active Directory domain database in order to steal credential information, as well as obtain other information about domain members such as devices, users, and access rights.
attack.mitre.org →
T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
T1003.008 /etc/passwd and /etc/shadow Credential Access
Adversaries may attempt to dump the contents of <code>/etc/passwd</code> and <code>/etc/shadow</code> to enable offline password cracking.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-32475Same product: Envoyproxy Envoy
CVE-2026-48044Same product: Envoyproxy Envoy
CVE-2024-34363Same product: Envoyproxy Envoy
CVE-2024-23325Same product: Envoyproxy Envoy
CVE-2024-23326Same product: Envoyproxy Envoy
CVE-2026-26309Same product: Envoyproxy Envoy
CVE-2026-48706Same product: Envoyproxy Envoy
CVE-2025-66220Same product: Envoyproxy Envoy
CVE-2021-29492Same product: Envoyproxy Envoy
CVE-2025-46821Same product: Envoyproxy Envoy

Affected Assets

envoyproxy
envoy
1.18.0 — 1.35.13 · 1.36.0 — 1.36.9 · 1.37.0 — 1.37.5

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation activities can identify overly complex code structures that exceed acceptable nesting thresholds.

SA-15 Development Process, Standards, and Tools partial match

Requiring documented development standards and tools can enforce explicit limits on code complexity metrics including nesting depth.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 partial match
blocks

Secure SDLC practices include static analysis and code review rules that directly limit excessive nesting depth.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.15 Access control partial match
removes
A.6.8 Information security event reporting partial match
removes
A.8.25 Secure development life cycle partial match
blocks

A.8.25 mandates secure SDLC practices including secure coding guidelines, security requirements, checkpoints, testing (scans/penetration), and developer training that reach deep nesting as a complexity defect, but only as one slice of a broad set of practices whose completeness depends on implementation rigor and does not guarantee the flaw is absent from all code.

A.8.26 Application security requirements partial match
removes

A.8.26 only requires that security requirements (including resilience against injection) be identified and specified during development or acquisition; it does not itself remove or correct excessively deep nesting already present in code

A.8.27 Secure system architecture and engineering principles partial match
removes

A.8.27 mandates establishing and applying secure engineering principles (including secure-by-design, least privilege, and design reviews) but does not itself rewrite or remove deep nesting already present in code; that is a first-party code defect outside the CVE-mediated removal path allowed for this verb.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly forbid or limit excessive nesting to improve readability and reduce defects.

References