Cyber Resilience

CVE-2026-48497

Envoyproxy Envoy ≤ 1.35.13

Published
26 June 2026
Modified
29 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 5.9
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0023 14th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-48497 is a medium-severity Use of Incorrect Operator (CWE-480) vulnerability in Envoyproxy Envoy. Its CVSS base score is 5.9 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 14th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) and SI-2 (Flaw Remediation) — 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, in cases where UDP DNS filter is configured with local resolution containing a name with the length of 255 octets…

more

or remote resolution for a name of 255 octets long can complete successfully, a query with such name will result in abnormal process termination. The abnormal process termination is triggered by an invalid runtime precondition that the query name is strictly less than 255 octets, contradicting DNS specification rfc1035#section-2.3.4 that the name can be 255 or less octets. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.

CWE(s)
CWE-480

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

DNS query of 255 octets triggers process crash in Envoy edge proxy (public-facing service), enabling remote DoS via application exploitation.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-48042Same product: Envoyproxy Envoy
CVE-2026-26310Same product: Envoyproxy Envoy
CVE-2026-47207Same product: Envoyproxy Envoy
CVE-2026-48706Same product: Envoyproxy Envoy
CVE-2026-26309Same product: Envoyproxy Envoy
CVE-2024-53270Same product: Envoyproxy Envoy
CVE-2024-23327Same product: Envoyproxy Envoy
CVE-2026-48090Same product: Envoyproxy Envoy
CVE-2025-66220Same product: Envoyproxy Envoy
CVE-2024-45809Same product: Envoyproxy Envoy

Affected Assets

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

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SI-10 Information Input Validation
  • SI-2 Flaw Remediation
Detect
Catch it (NIST detect / respond)
  • SI-4 System Monitoring
Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Enforces validation of DNS query name length to reject or safely handle 255-octet names before the failing precondition check.

SI-2 Flaw Remediation good match
prevent

Requires prompt application of the vendor patches (1.35.11+) that correct the incorrect length precondition in the UDP DNS filter.

SI-4 System Monitoring partial match
detect

Enables monitoring of Envoy process terminations or abnormal exits triggered by crafted 255-octet DNS queries.

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 mostly match
prevents

Secure SDLC practices (reviews, static analysis, testing) directly catch incorrect-operator bugs while the weakness is only one narrow class of coding defect the control addresses.

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.8.29 Security testing in development and acceptance mostly match
detects

Security testing and code review can catch operator errors before release.

A.8.28 Secure coding partial match
prevents

Secure coding standards and peer review directly prevent accidental use of incorrect operators.

A.8.32 Change management partial match
prevents

Change management processes may include code review gates that incidentally catch operator mistakes.

References