How severe is CVE-2026-45740?

CVE-2026-45740 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-45740 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-45740?

CVE-2026-45740 affects Protobufjs Project Protobufjs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-45740?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-45740 have an EU (EUVD) identifier?

Yes. CVE-2026-45740 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30039.

When was CVE-2026-45740 published?

CVE-2026-45740 was published on 2026-05-13 and last updated on 2026-06-17.

CVE-2026-45740

CVE-2026-45740 is a medium-severity vulnerability in Protobufjs Project Protobufjs with a CVSS 3.x base score of 5.3. 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-674.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30039
Weakness: CWE-674
Affected product: Protobufjs Project Protobufjs
Published: 2026-05-13
Last modified: 2026-06-17

Description

protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.8 and 8.2.0, protobufjs could recurse without a depth limit while expanding nested JSON descriptors through Root.fromJSON() and Namespace.addJSON(). A crafted JSON descriptor with deeply nested namespace definitions could cause the JavaScript call stack to be exhausted during descriptor loading. This vulnerability is fixed in 7.5.8 and 8.2.0.

Frequently asked questions

What is CVE-2026-45740?: protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.8 and 8.2.0, protobufjs could recurse without a depth limit while expanding nested JSON descriptors through Root.fromJSON() and Namespace.addJSON(). A crafted JSON descriptor with deeply nested namespace definitions could cause the JavaScript call stack to be exhausted during descriptor loading. This vulnerability is fixed in 7.5.8 and 8.2.0.
How severe is CVE-2026-45740?: CVE-2026-45740 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-45740 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-45740?: CVE-2026-45740 affects Protobufjs Project Protobufjs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-45740?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-45740 have an EU (EUVD) identifier?: Yes. CVE-2026-45740 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30039.
When was CVE-2026-45740 published?: CVE-2026-45740 was published on 2026-05-13 and last updated on 2026-06-17.

References

https://github.com/protobufjs/protobuf.js/security/advisories/GHSA-jggg-4jg4-v7c6

Affected products (1)

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

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