# CVE-2026-123871: Node.js is vulnerable to proxy credential disclosure via ERR_PROXY_INVALID_CONFIG error messages

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

Node.js discloses proxy credentials in ERR_PROXY_INVALID_CONFIG error messages. CVE-2026-48615 established that a proxy credential must not appear in a Node.js error message and redacted the username and password from ProxyConfig.href, but that fix missed four error paths in the same subsystem, one of them inside the same constructor, which interpolate the raw proxy URL, credentials included, into an ERR_PROXY_INVALID_CONFIG message. The proxy URL comes from the environment, but the defect is the sink: a secret that Node.js redacts everywhere else is emitted verbatim into a much wider audience than the process environment, such as stderr, container logs, log aggregation, and crash reporting services. This vulnerability affects Node.js 26.x, 24.x, and 22.x.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- nodejs / node: ≥ 0.0.0; < 22.23.5 (affected, semver); ≥ 23.0.0; < 24.22.3 (affected, semver); ≥ 25.0.0; < 26.13.1 (affected, semver). Source: CNA: openjs

## Severity and prioritization

- CVSS 3.0: 6.2 (medium); CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N; source: CNA: openjs

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-209

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://nodejs.org/en/blog/vulnerability/november-2026-security-releases (CNA: openjs; vendor-advisory)

- https://cna.openjsf.org/security-advisories.html (CNA: openjs)

## Provenance

- CNA: openjs: https://www.cve.org/CVERecord?id=CVE-2026-123871; retrieved 2026-11-11; source updated 2026-11-11

Revision: 2c880638c145f8cbca69fc35a909aef33d8ef336d06cf926dc087f865259f9cc

Canonical: https://y2.dev/cve/CVE-2026-123871

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