AUGUST 25, 2026
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Case File

CVE-2026-59877

MEDIUM · CVSS 5.3 EPSS 0.37% Public Exploit

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

CyberRota Analysis

AI-Generated

The vulnerability affects protobufjs versions prior to 7.6.5 and 8.6.6, where improper parsing of option names in .proto schemas can lead to an infinite loop during the loading process. This can result in denial of service, as applications may become unresponsive when processing malformed schema files. Developers and organizations using protobufjs should prioritize updating to the fixed versions to mitigate this risk.

Public Exploit Signal

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

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CVE
CVE-2026-59877
Severity
MEDIUM
CVSS
5.3
EPSS
0.37%
Java

Original NVD Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.6.5 and 8.6.6, protobufjs parsed option names by advancing through schema tokens until reaching an = token without checking for end of input, so a crafted .proto schema that opens an option declaration and ends prematurely can cause parse, Root.load, or Root.loadSync to loop indefinitely. This issue is fixed in versions 7.6.5 and 8.6.6.

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