Detections
Analytics

Chainguard: azure-functions-extension-bundles-4: security update to 4.40.0-r1

medium Tenable Cloud Security Plugin ID 476285

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-
 controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory
 allocation. The formatter allocates an object[] from each declared array length before the configured
 object-graph depth limit rejects the input, while nested array headers can reuse the same trailing unread
 bytes to satisfy per-header length validation. A comparatively small payload can therefore keep many large
 arrays alive at once. When an attacker can submit such data repeatedly, the allocations can cause severe
 managed-heap pressure, excessive garbage collection, process termination, or loss of service. Exposure
 requires an application to deserialize untrusted data through the affected formatter path and permit
 repeated attacker-controlled submissions, such as a reachable ASP.NET Core SignalR hub method with an
 object parameter and AddMessagePackProtocol() enabled. This issue is fixed in versions 2.5.303 and 3.1.9.
 (CVE-2026-92707)

Solution

Update the azure-functions-extension-bundles-4 library and its related packages to version 4.40.0-r1 or later.

Plugin Details

Severity: Medium

ID: 476285

Version: Revision 1.1

Type: Local

Published: 10/20/2026

Updated: 10/20/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4

Percentile: 53.46

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-92707

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 10/15/2026

Reference Information

CVE: CVE-2026-92707