Security readout for executives and security teams
Plain-English summary
CVE-2026-24131 affects pnpm before 10.28.2 on Unix-like systems. A malicious package can make pnpm change file permissions outside the package directory during install processing. This can expose sensitive local files by making them executable/readable according to chmod behavior. Windows is not affected per the advisory. A patched pnpm release is available.
Executive priority
Treat as a build and developer-environment security update. It is not described as remotely exploitable or actively exploited, but malicious packages could alter permissions on local files. Prioritize patching CI and developer systems because those environments commonly process untrusted dependency metadata.
Technical view
pnpm’s handling of a package directories.bin field used path.join() without confirming the resulting path remained under the package root. This creates path traversal leading to arbitrary chmod 755 operations. The issue maps to CWE-22 and CWE-732. CVSS 4.0 is 6.7 with local attack vector and user interaction required.
Likely exposure
Exposure is most likely in developer workstations, CI runners, and build systems using pnpm versions earlier than 10.28.2 on Linux, macOS, or other Unix-like platforms. Risk depends on installing or processing a malicious package. Windows is listed as not affected.
Exploitation context
Sources do not indicate active exploitation, and the CVE is not listed as KEV in the provided bundle. Exploitation requires pnpm to process a malicious package. The main impact described is unauthorized permission modification of files outside the package directory, not direct code execution.
Researcher notes
The patch is associated with pnpm 10.28.2 and commit 17432ad5bbed5c2e77255ca6d56a1449bbcfd943. Review the advisory and diff for boundary validation around directories.bin path handling. Avoid assuming broader impact beyond chmod permission changes and Unix-like platforms unless new vendor information appears.
Mitigation direction
- Upgrade pnpm to version 10.28.2 or later.
- Prioritize Unix/Linux/macOS developer and CI environments using pnpm.
- Review vendor advisory and release notes for deployment guidance.
- Restrict installation of untrusted packages in build and developer workflows.
Validation and detection
- Inventory pnpm versions across developer endpoints and CI runners.
- Confirm affected systems are running pnpm 10.28.2 or later.
- Identify Unix-like systems where pnpm processes third-party packages.
- Review package ingestion controls for untrusted npm dependencies.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-732: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-24131 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.7MediumVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/pnpm/pnpm/security/advisories/GHSA-v253-rj99-jwpqCVE reference · x_refsource_CONFIRM
- https://github.com/pnpm/pnpm/commit/17432ad5bbed5c2e77255ca6d56a1449bbcfd943CVE reference · x_refsource_MISC
- https://github.com/pnpm/pnpm/releases/tag/v10.28.2CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.