AUGUST 25, 2026
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Case File

CVE-2026-59876

MEDIUM · CVSS 4.8 EPSS 0.22% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-08 · Last synced 2026-08-07

CyberRota Analysis

AI-Generated

The vulnerability affects the protobufjs library in Java, specifically versions 8.2.0 to 8.6.5, where improper handling of string-keyed map entries can allow an attacker to manipulate the prototype of the returned map object by using the key "__proto__". This could lead to unexpected behavior or security issues in applications relying on this library. Developers and organizations utilizing protobufjs in their Java applications should prioritize upgrading to version 8.6.5 or later to mitigate potential risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

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CVE
CVE-2026-59876
Severity
MEDIUM
CVSS
4.8
EPSS
0.22%
Java

Original NVD Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key __proto__ to change the prototype of the returned map object instead of creating an own map entry in protobufjs/ext/textformat. This issue is fixed in version 8.6.5.

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