Allocation of Resources Without Limits or Throttling in protobuf.js - CVE-2026-54270
Published: June 13, 2026
Vulnerability identifier: #VU134486
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-54270
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: protobuf.js
Affected software:
protobuf.js
protobuf.js
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in unknown field retention during binary decode when processing attacker-controlled protobuf binary data. A remote attacker can send a crafted protobuf payload with many unknown fields to cause a denial of service.
Exploitation requires the application to decode untrusted protobuf binary input, treat attacker-selected field numbers as unknown, and retain decoded messages long enough for memory pressure to build.
How to mitigate CVE-2026-54270
Install security update from vendor's website.