How severe is CVE-2026-41242?

CVE-2026-41242 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-41242 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41242?

CVE-2026-41242 primarily affects Protobufjs Project Protobufjs. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-41242?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-41242 have an EU (EUVD) identifier?

Yes. CVE-2026-41242 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23678.

When was CVE-2026-41242 published?

CVE-2026-41242 was published on 2026-04-18 and last updated on 2026-06-30.

CVE-2026-41242

CVE-2026-41242 is a critical-severity vulnerability in Protobufjs Project Protobufjs with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.4
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23678
Weakness: CWE-94
Affected product: Protobufjs Project Protobufjs
Published: 2026-04-18
Last modified: 2026-06-30

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.

Frequently asked questions

What is CVE-2026-41242?: 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.
How severe is CVE-2026-41242?: CVE-2026-41242 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-41242 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41242?: CVE-2026-41242 primarily affects Protobufjs Project Protobufjs. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-41242?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-41242 have an EU (EUVD) identifier?: Yes. CVE-2026-41242 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23678.
When was CVE-2026-41242 published?: CVE-2026-41242 was published on 2026-04-18 and last updated on 2026-06-30.

References

Affected products (2)

cpe:2.3:a:protobufjs_project:protobufjs:*:*:*:*:*:node.js:*:*
cpe:2.3:a:protobufjs_project:protobufjs:8.0.0:*:*:*:*:node.js:*:*

More vulnerabilities in Protobufjs Project Protobufjs

CVE-2023-36665 — Critical (CVSS 9.8): "protobuf.js (aka protobufjs) 6.10.0 through 7.x before 7.2.5 allows Prototype Pollution, a different vulnerability…
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CVE-2026-44290 — High (CVSS 7.5): protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs allowed…

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