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CVE-2026-48497— Envoy: Abnormal process termination in DNS UDP filter

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy Proxy Envoy是Envoy Proxy团队的应用网关。 Envoy Proxy Envoy存在处理逻辑错误漏洞，该漏洞源于无效的运行时前置条件导致进程异常终止。以下版本受到影响：1.35.11之前版本、1.36.0至1.36.7之前版本、1.37.0至1.37.3之前版本和1.38.0至1.38.1之前版本。

CVSS 5.9 · Medium EPSS 0.23% · P14

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProduct Version RangeStatus
envoyproxy envoy >= 1.38.0, < 1.38.1 affected
>= 1.37.0, < 1.37.3 affected
>= 1.36.0, < 1.36.7 affected
< 1.35.11 affected
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I. Basic Information for CVE-2026-48497

Vulnerability Information
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Vulnerability Title
Envoy: Abnormal process termination in DNS UDP filter
Source: CVE Program / CVE List V5
Vulnerability Description
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 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用操作符不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy Proxy Envoy 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy Proxy Envoy是Envoy Proxy团队的应用网关。 Envoy Proxy Envoy存在处理逻辑错误漏洞，该漏洞源于无效的运行时前置条件导致进程异常终止。以下版本受到影响：1.35.11之前版本、1.36.0至1.36.7之前版本、1.37.0至1.37.3之前版本和1.38.0至1.38.1之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.38.0, < 1.38.1 -

II. Public POCs for CVE-2026-48497

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III. Intelligence Information for CVE-2026-48497

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Vendor Advisories for CVE-2026-48497 (1)

Same Patch Batch · envoyproxy · 2026-06-26 · 14 CVEs total

CVE-2026-48743 7.5 HIGH Envoy: HTTP/3 to HTTP/1 request smuggling via headers-only request with nonzero Content-Le
CVE-2026-48042 7.5 HIGH Envoy: Stack overflow in destructor of highly nested JSON
CVE-2026-48044 7.5 HIGH Envoy Zstd Decompressor: Ratio Check at Wrong Loop Depth lead to memory explosion
CVE-2026-47220 7.5 HIGH Envoy: Segmentation fault when using %REQUESTED_SERVER_NAME% in log format
CVE-2026-47775 6.8 MEDIUM Envoy OAuth2 Filter: Padding Oracle via AES-256-CBC Cookie Decryption
CVE-2026-47204 6.5 MEDIUM Envoy: grpc_stats filter segfault on Connect protocol requests to direct_response routes
CVE-2026-47207 6.5 MEDIUM Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message
CVE-2026-47221 5.9 MEDIUM Envoy: Null pointer deref in internal redirects
CVE-2026-48706 5.9 MEDIUM Envoy Heap Buffer Overflow in TcpStatsdSink
CVE-2026-47205 5.9 MEDIUM Envoy: ext_authz Use-After-Free during Stream Teardown with Per-Route Overrides
CVE-2026-48090 5.9 MEDIUM Envoy HTTP: OAuth2 filter late async token completion after stream teardown (UAF / crash r
CVE-2026-47692 4.8 MEDIUM Envoy: PROXY Protocol v2 header generator emits "skipped" TLVs, causing 65 KB attacker-con
CVE-2026-47778 4.4 MEDIUM Envoy: Embedded NUL in TLS DNS SAN Truncation in the Default TLS Certificate Validator. (A

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-480

V. Comments for CVE-2026-48497

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