CVE-2026-55700
pnpm: stage download writes outside destination via manifest version traversal
Description
pnpm is a package manager. From 11.3.0 until 11.5.3, `pnpm stage download` derived a local filename from registry-controlled package name and version fields. A crafted manifest could escape the selected download directory and overwrite another reachable file. The merged fix validates both fields, derives one safe filename, and verifies the final destination before writing. This vulnerability is fixed in 11.5.3.
INFO
Published Date :
June 25, 2026, 6:16 p.m.
Last Modified :
June 29, 2026, 9:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update pnpm to version 11.5.3 or later.
- Ensure package manifests are validated.
- Verify file destinations before writing.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55700.
| URL | Resource |
|---|---|
| https://github.com/pnpm/pnpm/pull/12303 | Patch |
| https://github.com/pnpm/pnpm/security/advisories/GHSA-v23m-ccfg-pq9h | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55700 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55700
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55700 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55700 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 29, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:pnpm:pnpm:*:*:*:*:*:node.js:*:* versions from (including) 11.3.0 up to (excluding) 11.5.3 Added Reference Type GitHub, Inc.: https://github.com/pnpm/pnpm/pull/12303 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/pnpm/pnpm/security/advisories/GHSA-v23m-ccfg-pq9h Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 25, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-55700', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-25T18:16:18.487487Z'} -
New CVE Received by [email protected]
Jun. 25, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'pnpm', 'product': 'pnpm', 'versions': [{'status': 'affected', 'version': '>= 11.3.0, < 11.5.3'}]}] Added Description pnpm is a package manager. From 11.3.0 until 11.5.3, `pnpm stage download` derived a local filename from registry-controlled package name and version fields. A crafted manifest could escape the selected download directory and overwrite another reachable file. The merged fix validates both fields, derives one safe filename, and verifies the final destination before writing. This vulnerability is fixed in 11.5.3. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L Added CWE CWE-22 Added CWE CWE-73 Added Reference https://github.com/pnpm/pnpm/pull/12303 Added Reference https://github.com/pnpm/pnpm/security/advisories/GHSA-v23m-ccfg-pq9h