How severe is CVE-2026-40931?

CVE-2026-40931 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40931 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40931?

CVE-2026-40931 affects Node-modules Compressing. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40931?

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

Does CVE-2026-40931 have an EU (EUVD) identifier?

Yes. CVE-2026-40931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24488.

When was CVE-2026-40931 published?

CVE-2026-40931 was published on 2026-04-21 and last updated on 2026-06-17.

CVE-2026-40931

CVE-2026-40931 is a high-severity vulnerability in Node-modules Compressing with a CVSS 3.x base score of 8.4. 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-59.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24488
Weakness: CWE-59
Affected product: Node-modules Compressing
Published: 2026-04-21
Last modified: 2026-06-17

Description

Compressing is a compressing and uncompressing lib for node. Prior to 2.1.1 and 1.10.5, the patch for CVE-2026-24884 relies on a purely logical string validation within the isPathWithinParent utility. This check verifies if a resolved path string starts with the destination directory string but fails to account for the actual filesystem state. By exploiting this "Logical vs. Physical" divergence, an attacker can bypass the security check using a Directory Poisoning technique (pre-existing symbolic links). This vulnerability is fixed in 2.1.1 and 1.10.5.

Frequently asked questions

What is CVE-2026-40931?: Compressing is a compressing and uncompressing lib for node. Prior to 2.1.1 and 1.10.5, the patch for CVE-2026-24884 relies on a purely logical string validation within the isPathWithinParent utility. This check verifies if a resolved path string starts with the destination directory string but fails to account for the actual filesystem state. By exploiting this "Logical vs. Physical" divergence, an attacker can bypass the security check using a Directory Poisoning technique (pre-existing symbolic links). This vulnerability is fixed in 2.1.1 and 1.10.5.
How severe is CVE-2026-40931?: CVE-2026-40931 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40931 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40931?: CVE-2026-40931 affects Node-modules Compressing. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40931?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40931 have an EU (EUVD) identifier?: Yes. CVE-2026-40931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24488.
When was CVE-2026-40931 published?: CVE-2026-40931 was published on 2026-04-21 and last updated on 2026-06-17.

References

https://github.com/node-modules/compressing/security/advisories/GHSA-4c3q-x735-j3r5

Affected products (1)

cpe:2.3:a:node-modules:compressing:*:*:*:*:*:node.js:*:*

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