How severe is CVE-2026-21440?

CVE-2026-21440 has a CVSS 4.0 base score of 9.2, rated critical severity.

Is CVE-2026-21440 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-21440?

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-2026-21440 have an EU (EUVD) identifier?

Yes. CVE-2026-21440 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0036.

When was CVE-2026-21440 published?

CVE-2026-21440 was published on 2026-01-02 and last updated on 2026-06-17.

CVE-2026-21440

CVE-2026-21440 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.2. 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-22.

Key facts

Severity: Critical (CVSS 4.0 base score 9.2)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-0036
Weakness: CWE-22
Published: 2026-01-02
Last modified: 2026-06-17

Description

AdonisJS is a TypeScript-first web framework. A Path Traversal vulnerability in AdonisJS multipart file handling may allow a remote attacker to write arbitrary files to arbitrary locations on the server filesystem. This impacts @adonisjs/bodyparser through version 10.1.1 and 11.x prerelease versions prior to 11.0.0-next.6. This issue has been patched in @adonisjs/bodyparser versions 10.1.2 and 11.0.0-next.6.

Frequently asked questions

What is CVE-2026-21440?: AdonisJS is a TypeScript-first web framework. A Path Traversal vulnerability in AdonisJS multipart file handling may allow a remote attacker to write arbitrary files to arbitrary locations on the server filesystem. This impacts @adonisjs/bodyparser through version 10.1.1 and 11.x prerelease versions prior to 11.0.0-next.6. This issue has been patched in @adonisjs/bodyparser versions 10.1.2 and 11.0.0-next.6.
How severe is CVE-2026-21440?: CVE-2026-21440 has a CVSS 4.0 base score of 9.2, rated critical severity.
Is CVE-2026-21440 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-21440?: 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-2026-21440 have an EU (EUVD) identifier?: Yes. CVE-2026-21440 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-0036.
When was CVE-2026-21440 published?: CVE-2026-21440 was published on 2026-01-02 and last updated on 2026-06-17.

References

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