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Medium, CVSS 6.9amended

Axios: CIDR-form NO_PROXY entries are ignored, causing proxy exclusion bypass for internal IP ranges

CVE-2026-101899GHSA-44g4-m2mj-wpvx

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (axios 1.20.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm axios

    Affected
    >= 1.15.0, < 1.20.0
    Fixed in
    1.20.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N · score source
EPSS
  • CVE-2026-101899: 0.51% estimated exploitation activity in the next 30 days; percentile 43.73 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary Axios supports proxy environment variables and evaluates NOPROXY exclusions in the Node.js adapter. CIDR-form NOPROXY entries such as 127.0.0.0/8, 10.0.0.0/8, or 169.254.169.254/32 are not interpreted as IP ranges. As a result, a request to an IP address inside a configured CIDR exclusion can still be sent through the configured proxy. This affects deployments that rely on CIDR notation to keep loopback, private, Kubernetes, CI, or cloud metadata traffic away from proxy infrastructure. Impact If the configured proxy is outside the intended trust boundary, requests that operators expected to bypass the proxy may be exposed to it. For plaintext HTTP targets, the proxy can see and modify URLs, headers, and bodies. For HTTPS targets, the proxy still observes connection metadata and may receive CONNECT requests that policy expected to avoid. This is a proxy exclusion bypass, not arbitrary proxy injection by itself. Affected Functionality Affected: - Node.js adapter proxy…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-44g4-m2mj-wpvx

  2. Revision 3 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 2 · amended ·

    Amended from osv record GHSA-44g4-m2mj-wpvx

  4. Revision 1 · created ·

    Published from ghsa record GHSA-44g4-m2mj-wpvx

Agent brief

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# Patch Next advisory brief: CVE-2026-101899

Advisory: Axios: CIDR-form NO_PROXY entries are ignored, causing proxy exclusion bypass for internal IP ranges
IDs: CVE-2026-101899, GHSA-44g4-m2mj-wpvx
Record: https://patchnext.com/advisories/cve-2026-101899 (revision 4, source checked 26 Oct 2026, 13:06 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: axios 1.20.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm axios: affected >= 1.15.0, < 1.20.0; fixed in 1.20.0

## Suggested inspection (read-only)
- `npm ls axios --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on axios.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-44g4-m2mj-wpvx (GitHub-reviewed advisory GHSA-44g4-m2mj-wpvx lists affected ranges: npm axios >=1.15.0 <1.20.0)
- Verified: https://osv.dev/vulnerability/GHSA-44g4-m2mj-wpvx (OSV record GHSA-44g4-m2mj-wpvx lists affected ranges: npm axios >=1.15.0 <1.20.0 (fixed))

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