HOMEVULNERABILITIESCVE-2026-40931
HIGH

CVE-2026-40931

CWE-59Published: April 21, 2026· Updated: Apr 23, 2026

7.8
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.8th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40931 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

node-modules1 product
compressing
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (2)

→
https://github.com/node-modules/compressing/security/advisories/GHSA-4c3q-x735-j3r5Exploit · Mitigation · Vendor Advisory
→
https://github.com/node-modules/compressing/security/advisories/GHSA-4c3q-x735-j3r5Exploit · Mitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2026-40931
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-59
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedApr 21, 2026

Related CVEs (CWE-59)

CVE-2026-44881
9.9
CVE-2026-7374
9.9
CVE-2025-66277
9.8
CVE-2026-50549
9.8
CVE-2026-41397
9.6
CVE-2026-53476
9.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-40931 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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