Secuno
ENNL
Book demo

CVE-2026-40931

Node-modules Compressing vulnerability

8.4 HIGHPublic exploitEPSS 0.22%
  1. Published21 Apr 2026

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.

CVSS 3.1 breakdown

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

Affected products

Node-modules Compressing≥ 2.0.0 < 2.1.1 · < 1.10.5

Remediation

Fixed in
Node-modules Compressing≥ 2.1.1

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1078108.1
Nginx UI is a web user interface for the Nginx web server. From 2.0.0 until 2.5.0,…
CVE-2026-890918.8
A flaw was found in ansible-core. When installing a collection with `ansible-galaxy…
CVE-2026-1065008.5
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1,…
CVE-2026-1064868.5
Backstage is an open framework for building developer portals. Prior to 0.3.10 in…
CVE-2026-1018949.1
The decompress package for Node.js extracts archives. Prior to 10.2.2 and 11.1.4, the…
CVE-2026-877999.9
Improper link resolution in the migration receive path in Canonical LXD versions 4.0…

Frequently asked

Is CVE-2026-40931 being actively exploited?

CVE-2026-40931 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.22%.

How severe is CVE-2026-40931?

CVE-2026-40931 has a CVSS 3.1 base score of 8.4, rated high. EPSS estimates a 0.22% probability of exploitation.

Which products are affected by CVE-2026-40931?

Affected products include Node-modules Compressing.

How do I fix CVE-2026-40931?

Upgrade affected software to a fixed version, for example Node-modules Compressing 2.1.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40931 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.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

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