CVE•Published 2026-04-21•Modified 2026-04-23•1 article on news•7 live references•NVD data

CVE-2026-40931Node-modules · Compressing

Vulnerability data via NVD (ingested)

CVSS v3.1

8.4

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

—

Weaknesses (CWE)

CWE-59Improper Link Resolution Before File Access ('Link Following')

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.

Timeline

Published 2026-04-21

Modified 2026-04-23

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-40931

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Node-modules Compressing"

All exposed Node-modules Compressing instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Compressing"

HTTP body or banner mentions "Compressing" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-40931