CVE-2026-55102: hashi-vault-js Vault Token And Secret Values Vulnerability

MODERATE
Advisory Identifier: GHSA-5pq8-3ffp-7w5m
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CWE-532 CWE-209
Published
Advisory Summary

CVE-2026-55102 is a MODERATE vault token and secret values vulnerability (CWE-532: Insertion of Sensitive Information into Log File) affecting hashi-vault-js libraries in the npm ecosystem. The issue involves vault token and secret values exposed in thrown errors. Remediation is available by upgrading affected packages to version 0.5.2.

CVE-2026-55102 at a Glance

CVE Identifier CVE-2026-55102
GHSA Identifier GHSA-5pq8-3ffp-7w5m
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-532: Insertion of Sensitive Information into Log File
Affected Product hashi-vault-js
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-55102

To remediate this vulnerability, upgrade all affected hashi-vault-js dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

hashi-vault-js fixed: 0.5.2 
npm install hashi-vault-js@0.5.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls hashi-vault-js

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-55102, inspect your project dependencies using npm:

npm ls hashi-vault-js

Analyze the terminal output to locate any version of hashi-vault-js in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.5.2), your application is affected.

Note: The npm ls hashi-vault-js command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-532: Insertion of Sensitive Information into Log File, where the product writes sensitive information to a log file. In hashi-vault-js, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Summary Vault token and secret values are exposed in thrown errors when using `hashi-vault-js`. ## Details Every API method in `Vault.js` executes `throw parseAxiosError(err)`, which returns the raw `AxiosError` untouched. That error carries the full Axios configuration, including the `X-Vault-Token` header and the request body. Consuming applications that log caught errors (e.g., using `console.error`, `pino`, `winston`, Sentry, or APMs) inadvertently log the live Vault token in plaintext. Furthermore, write-path methods expose submitted passwords and secret values via `err.config.data`. ## Impact When consuming applications log intercepted exceptions, sensitive credentials such as tokens, passwords, and secrets are unknowingly exposed to application logs, monitoring services, and APM systems via the raw `AxiosError`. This may lead to authorization bypass or unauthorized access to the underlying Vault instance. ## Patches This vulnerability should be addressed by redacting `err.config.headers['X-Vault-Token']` and `err.config.data` before re-throwing, or by throwing a purpose-built error containing only safe properties like status and message. Users should upgrade to a version that includes this fix. ## Workarounds If users cannot immediately update the library, they can mitigate this issue by capturing all exceptions thrown by `hashi-vault-js` and sanitizing or omitting the `err.config` object before passing the errors to logging utilities or crash reporters. ## Acknowledgements hashi-vault-js would like to thank Sebastián Alba Vives for reporting this vulnerability. ## Resources - [CWE-532: Insertion of Sensitive Information into Log File](https://cwe.mitre.org/data/definitions/532.html) - [CWE-209: Generation of Error Message Containing Sensitive Information](https://cwe.mitre.org/data/definitions/209.html)

CVE-2026-55102 Affected hashi-vault-js Versions

1 component(s)
Fixed Versions:
0.5.2
Product / Package Ecosystem Affected Versions Fixed Version
hashi-vault-js
npm/hashi-vault-js
npm
< 0.5.2
0.5.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/kyndryl-open-source/hashi-vault-js/security/advisories/GHSA-5pq8-3ffp-7w5m
hashi-vault-js Source Repository REPOSITORY
https://github.com/kyndryl-open-source/hashi-vault-js

Frequently Asked Questions

What is CVE-2026-55102?
CVE-2026-55102 is a security vulnerability in hashi-vault-js involving Vault token and secret values exposed in thrown errors under CWE-532: Insertion of Sensitive Information into Log File.
Which hashi-vault-js versions are affected?
Affected versions include releases prior to 0.5.2 across affected packages: hashi-vault-js.
What version fixes CVE-2026-55102?
Upgrading to 0.5.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is hashi-vault-js affected?
Yes, hashi-vault-js is affected in releases prior to 0.5.2. Upgrade your dependency to 0.5.2 or later.
What CWE is associated with CVE-2026-55102?
CVE-2026-55102 is classified under CWE-532: Insertion of Sensitive Information into Log File (The product writes sensitive information to a log file.).
How can I check npm dependencies for CVE-2026-55102?
Run the dependency tree command: 'npm ls hashi-vault-js'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5pq8-3ffp-7w5m",
  "modified" : "2026-08-13T14:14:32Z",
  "published" : "2026-08-13T14:14:32Z",
  "aliases" : [ "CVE-2026-55102" ],
  "summary" : "hashi-vault-js: Vault token and secret values exposed in thrown errors",
  "details" : "## Summary\n\nVault token and secret values are exposed in thrown errors when using `hashi-vault-js`.\n\n## Details\n\nEvery API method in `Vault.js` executes `throw parseAxiosError(err)`, which returns the raw `AxiosError` untouched. That error carries the full Axios configuration, including the `X-Vault-Token` header and the request body. Consuming applications that log caught errors (e.g., using `console.error`, `pino`, `winston`, Sentry, or APMs) inadvertently log the live Vault token in plaintext. Furthermore, write-path methods expose submitted passwords and secret values via `err.config.data`.\n\n## Impact\n\nWhen consuming applications log intercepted exceptions, sensitive credentials such as tokens, passwords, and secrets are unknowingly exposed to application logs, monitoring services, and APM systems via the raw `AxiosError`. This may lead to authorization bypass or unauthorized access to the underlying Vault instance.\n\n## Patches\n\nThis vulnerability should be addressed by redacting `err.config.headers['X-Vault-Token']` and `err.config.data` before re-throwing, or by throwing a purpose-built error containing only safe properties like status and message. Users should upgrade to a version that includes this fix.\n\n## Workarounds\n\nIf users cannot immediately update the library, they can mitigate this issue by capturing all exceptions thrown by `hashi-vault-js` and sanitizing or omitting the `err.config` object before passing the errors to logging utilities or crash reporters.\n\n## Acknowledgements\nhashi-vault-js would like to thank Sebastián Alba Vives for reporting this vulnerability.\n\n## Resources\n\n- [CWE-532: Insertion of Sensitive Information into Log File](https://cwe.mitre.org/data/definitions/532.html)\n- [CWE-209: Generation of Error Message Containing Sensitive Information](https://cwe.mitre.org/data/definitions/209.html)",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "hashi-vault-js"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.5.1"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/kyndryl-open-source/hashi-vault-js/security/advisories/GHSA-5pq8-3ffp-7w5m"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kyndryl-open-source/hashi-vault-js"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-209", "CWE-532" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-13T14:14:32Z",
    "nvd_published_at" : null
  }
}