pnpm: stage download writes outside destination via manifest version traversal
Published Jun 25, 2026
7.1
HIGHCVSS 3.1
EPSS 0.42%
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.
Affected products
-
- Version >= 11.3.0, < 11.5.3StatusaffectedConstraints-
- Version
No data.
Red Hat AMQ Broker 7
pnpm
Not affected
Red Hat Build of Keycloak
pnpm
Not affected
Red Hat JBoss Enterprise Application Platform 8
pnpm
Not affected
Red Hat JBoss Enterprise Application Platform Expansion Pack
pnpm
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat AMQ Broker 7 | pnpm | Not affected | n/a |
| Red Hat Build of Keycloak | pnpm | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 8 | pnpm | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform Expansion Pack | pnpm | Not affected | n/a |
pnpm
npm
Introduced 11.3.0 Fixed 11.5.3
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | pnpm | 11.3.0 | 11.5.3 |
Remediation
Red Hat statement
This Important flaw in pnpm allows a remote attacker to achieve arbitrary file write by providing a specially crafted package manifest during the `pnpm stage download` operation. This could lead to unauthorized modification of system files and compromise system integrity, particularly in environments where pnpm processes untrusted package sources.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Jun 25, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Jun–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.42% (0.00417) | 33.76th | v5 (v2026.06.15) |
| Jun 26, 2026 | 0.26% (0.00258) | 17.11th | v5 (v2026.06.15) |
References (7)
- https://access.redhat.com/security/cve/CVE-2026-55700 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2493019 Issue Tracking
- https://github.com/advisories/GHSA-v23m-ccfg-pq9h Advisory
- https://github.com/pnpm/pnpm/pull/12303 x_refsource_MISCPatch
- https://github.com/pnpm/pnpm/security/advisories/GHSA-v23m-ccfg-pq9h x_refsource_CONFIRMExploitVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-55700
- https://www.cve.org/CVERecord?id=CVE-2026-55700
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-55700 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2493019 | Issue Tracking | |
| https://github.com/advisories/GHSA-v23m-ccfg-pq9h | Advisory | |
| https://github.com/pnpm/pnpm/pull/12303 | x_refsource_MISCPatch | |
| https://github.com/pnpm/pnpm/security/advisories/GHSA-v23m-ccfg-pq9h | x_refsource_CONFIRMExploitVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-55700 | ||
| https://www.cve.org/CVERecord?id=CVE-2026-55700 |
Change history (0)
No recorded changes yet.