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CVE-2026-63395

8.8 highEPSS 0.7%

High (8.8). EPSS 0.7% estimated probability of exploitation activity in the next 30 days.

On this page
isomorphic-git is a pure JavaScript implementation of Git for Node.js and browsers. Prior to 1.38.6, isomorphic-git's git.checkout writes new child paths through symlinked leading directory components without checking them. A malicious repository can first place a directory symlink and later replace the tree state with a child file beneath that path; the usual trigger is a clone followed by a later pull, while a single clone can trigger the issue when a symlink already exists or the consuming application accesses the tree. With Node fs on Linux or macOS, the operating system can resolve the write outside the working tree, permitting arbitrary host file writes and possible code execution. Node fs on Windows usually blocks the symlink plant without additional privilege, and browser or in-memory providers limit impact to their virtual filesystem and are affected only when they implement symlink creation and following. This issue is fixed in version 1.38.6.

Severity

CVSS 3.1

8.8 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
0.7% estimated probability of exploitation activity in the next 30 days; 54th percentile. Scored 2026-11-04. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: PoC · Automatable: no · Technical impact: total, assessed 2026-11-03. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWEs
CWE-22 Improper Limitation of a Pathname to a Restricted Directory (Path traversal)
CWE-59 Improper Link Resolution Before File Access (Link Following)
OWASP Top 10
A01:2025 Broken Access Control
Published
Modified
Record from
the NVD, synced

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Versions

From the CNA's record in the CVE List.

ProductAffected
isomorphic-git< 1.38.6

Red Hat

Red Hat rates this Important.

ProductPackageStateAdvisory
OpenShift Serverlessopenshift-serverless-1/logic-rhel9-operatorAffected
Red Hat Developer Hub 1rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backendAffected
Red Hat Developer Hub 1rhdh/red-hat-developer-hub-backstage-plugin-scaffolder-backend-module-orchestratorAffected
Red Hat Developer Hub 1rhdh/rhdh-hub-rhel9Affected
Self-service automation portal 2ansible-automation-platform/automation-portalAffected
Self-service automation portal 2ansible-automation-platform/bootc-automation-portal-rhel9Affected

Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-63395.

Attack patterns (CAPEC)

  • CAPEC-17 Using Malicious Files Likelihood: High · Severity: Very High
  • CAPEC-35 Leverage Executable Code in Non-Executable Files Likelihood: High · Severity: Very High
  • CAPEC-76 Manipulating Web Input to File System Calls Likelihood: High · Severity: Very High
  • CAPEC-132 Symlink Attack Likelihood: Low · Severity: High
  • CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic Likelihood: High · Severity: High
  • CAPEC-78 Using Escaped Slashes in Alternate Encoding Likelihood: High · Severity: High
  • CAPEC-79 Using Slashes in Alternate Encoding Likelihood: High · Severity: High
  • CAPEC-126 Path Traversal Likelihood: High · Severity: Very High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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