Dashboard / CVE-2026-59876

CVE-2026-59876

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 60/100
Published: 2026-07-08 Modified: 2026-10-25 First seen: 2026-10-29 Status: active

Attack Surface

Network No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: High
PR: None
UI: None
S: Unchanged
C: Low
I: Low
A: None

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
protobufjs_project protobufjs 8.2.0 – 8.6.5

References & Advisories (4)

Bug Bounty Relevance

60 / 100
✓ Network accessible
✓ No authentication
✓ No user interaction

CVSS Score

4.8 / 10.0 v3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploitation Probability

0.35%
Raw Score 0.003490
Percentile 28.5%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00349
2026-10-28
0.00349

Intelligence Sources

nvd ref →

External Links