What is the CVSS score of EUVD-2026-39826?

EUVD-2026-39826 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.4%.

Is there a patch available for EUVD-2026-39826?

Yes, a patch is available for EUVD-2026-39826. Update the affected software to the latest version immediately.

Envoy Proxy EUVD-2026-39826

| CVE-2026-47207 MEDIUM

Use After Free (CWE-416)

2026-06-26 GitHub_M

Memory Corruption Denial Of Service Use After Free Envoy

6.5

CVSS 3.1 · Vendor: GitHub_M

Severity by source

Vendor (GitHub_M) PRIMARY

6.5 MEDIUM

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

vuln.today AI

6.5 MEDIUM

Network vector and low complexity are accurate; PR:L reflects mandatory control of the ext_proc gRPC server; only availability impact applies.

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

4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Patch available

Jun 26, 2026 - 19:02 EUVD

Analysis Generated

Jun 26, 2026 - 18:36 vuln.today

DescriptionCVE.org

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, Envoy crashes if an ext_proc server sends a single gRPC message containing multiple, specially crafted ProcessingResponse messages. This can occur when the first response in the batch causes the gRPC stream object to be destroyed, leading to a use-after-free error when Envoy attempts to process subsequent responses in the same gRPC message. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.

AnalysisAI

Envoy proxy's External Processing (ext_proc) filter crashes with a use-after-free when an ext_proc gRPC server sends a single batched gRPC message containing multiple specially crafted ProcessingResponse objects. Affected versions span 1.34.0 through pre-fix releases across four maintained branches; fixed releases are 1.35.13, 1.36.9, 1.37.5, and 1.38.3. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Compromise or control configured ext_proc gRPC server

Delivery

Craft gRPC message batching multiple malformed ProcessingResponse frames

Exploit

Deliver batched message to target Envoy instance

Execution

First response triggers gRPC stream object destruction

Persist

Subsequent response dereferences freed stream pointer

Impact

Envoy process crashes (denial of service)

Access

Compromise or control configured ext_proc gRPC server

Delivery

Craft gRPC message batching multiple malformed ProcessingResponse frames

Exploit

Deliver batched message to target Envoy instance

Execution

First response triggers gRPC stream object destruction

Persist

Subsequent response dereferences freed stream pointer

Impact

Envoy process crashes (denial of service)

Vulnerability AssessmentAI

Exploitation	The ext_proc (External Processing) filter must be explicitly enabled in the Envoy configuration - it is not active by default and requires deliberate opt-in. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The CVSS 6.5 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) is well-calibrated for this vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker who has compromised or controls a configured ext_proc gRPC server crafts a single gRPC protocol message that bundles multiple ProcessingResponse frames, where the first frame is designed to trigger destruction of Envoy's gRPC stream object. When Envoy receives and processes the batched message, the iterator accesses the freed stream pointer for subsequent frames, causing a use-after-free crash and taking the proxy process down. …
Remediation	Upgrade Envoy to a patched release on your current branch: 1.35.13, 1.36.9, 1.37.5, or 1.38.3, as documented in the vendor advisory at https://github.com/envoyproxy/envoy/security/advisories/GHSA-68cv-hq5f-g6xv. … Detailed patch versions, workarounds, and compensating controls in full report.