Is CVE-2026-54270 actively exploited?

No active exploitation of CVE-2026-54270 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-54270 be exploited remotely?

Yes. CVE-2026-54270 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-54270?

CVE-2026-54270 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-54270

CWE-770Published: June 22, 2026· Updated: Jun 24, 2026

5.3

CVSS v3.1

EPSS:0.29%probability of exploitation in 30 daysPercentile:20.8th

Official Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 to 8.4.2, protobufjs preserved unknown wire elements in message.$unknowns and did not provide a decode-time option to discard unknown fields before retaining them. A crafted protobuf payload containing many unknown fields could therefore cause a decoded message to retain substantially more memory than the input size would suggest, even when unknown-field round-tripping is not needed. protobufjs 8.5.0 added the relevant decode-time options, allowing applications that decode untrusted protobuf data to disable unknown-field retention during decode. protobufjs 8.6.2 flips the default so unknown fields are discarded unless explicitly opted into.

NVD Source

Technical Analysis

CVE-2026-54270 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.