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CVE-2026-41242

Protobufjs code injection

9.8 CRITICALPublic exploitEPSS 0.99%
  1. Published18 Apr 2026

Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. In versions prior to 8.0.1 and 7.5.5, attackers can inject arbitrary code in the "type" fields of protobuf definitions, which will then execute during object decoding using that definition. Versions 8.0.1 and 7.5.5 patch the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Protobufjs8.0.0 · < 7.5.5

Remediation

Fixed in
Protobufjs≥ 7.5.5

References

and 3 more references

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Frequently asked

Is CVE-2026-41242 being actively exploited?

CVE-2026-41242 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.99%.

How severe is CVE-2026-41242?

CVE-2026-41242 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.99% probability of exploitation.

Which products are affected by CVE-2026-41242?

Affected products include Protobufjs.

How do I fix CVE-2026-41242?

Upgrade affected software to a fixed version, for example Protobufjs 7.5.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-41242 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.