CVE-2026-42043Public exploitNetwork attack vectorHinoki check available

SSRF via incomplete loopback address matching

Published Apr 24, 2026 · Updated Aug 26, 2026

SSRF in Axios before 0.31.1 and 1.0.0 through 1.15.0 allows remote attackers to expose loopback traffic via crafted target URLs. The isLoopback check in lib/helpers/shouldBypassProxy.js recognizes only 127.0.0.1 instead of the full 127.0.0.0/8 block. Exploitation requires control of a request URL plus configured HTTP_PROXY or HTTPS_PROXY and NO_PROXY, exposing requests and responses to that proxy.

CVSS severity7.2
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in Axios before 0.31.1 and 1.0.0 through 1.15.0 allows remote attackers to expose loopback traffic via crafted target URLs. The isLoopback check in lib/helpers/shouldBypassProxy.js recognizes only 127.0.0.1 instead of the full 127.0.0.0/8 block. Exploitation requires control of a request URL plus configured HTTP_PROXY or HTTPS_PROXY and NO_PROXY, exposing requests and responses to that proxy.

The record

CVE
CVE-2026-42043
Published
Apr 24, 2026
Updated
Aug 26, 2026
Vendor
389 Directory Server
Product
Red Hat Quay
Classifications
CWE-918, CWE-183, CWE-441
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat QuayAffected versions are unavailable in this record.
389 Directory Server · Red Hat Quay 3.12Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Service MeshAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift AIAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Dev SpacesAffected versions are unavailable in this record.
389 Directory Server · Red Hat Quay 3.1Affected versions are unavailable in this record.
389 Directory Server · Red Hat build of Apicurio RegistryAffected versions are unavailable in this record.
389 Directory Server · Red Hat Developer HubAffected versions are unavailable in this record.
389 Directory Server · Red Hat build of Apicurio Registry 2Affected versions are unavailable in this record.
Axios · Axiosversion=< 0.31.1; version=>= 1.0.0, < 1.15.1
389 Directory Server · Red Hat Enterprise Linux AIAffected versions are unavailable in this record.
389 Directory Server · multicluster engine for Kubernetes 2.6Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4.21Affected versions are unavailable in this record.
389 Directory Server · Red Hat Advanced Cluster Management for KubernetesAffected versions are unavailable in this record.
389 Directory Server · Red Hat Advanced Cluster Security for KubernetesAffected versions are unavailable in this record.
389 Directory Server · multicluster engine for Kubernetes 2.10Affected versions are unavailable in this record.
389 Directory Server · Network Observability OperatorAffected versions are unavailable in this record.
389 Directory Server · Red Hat Ansible Automation PlatformAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Service Mesh 3.1Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Service Mesh 2.6Affected versions are unavailable in this record.
389 Directory Server · multicluster engine for Kubernetes 2.8Affected versions are unavailable in this record.
389 Directory Server · Red Hat Migration ToolkitAffected versions are unavailable in this record.
389 Directory Server · Self-service automation portalAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Service Mesh 3.2Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Service Mesh 3.3Affected versions are unavailable in this record.
389 Directory Server · Red Hat Quay 3.15Affected versions are unavailable in this record.
389 Directory Server · Red Hat Discovery 2Affected versions are unavailable in this record.
389 Directory Server · Red Hat Build of Podman Desktop - Tech PreviewAffected versions are unavailable in this record.
389 Directory Server · Red Hat SatelliteAffected versions are unavailable in this record.
389 Directory Server · Red Hat Quay 3.14Affected versions are unavailable in this record.
389 Directory Server · multicluster engine for Kubernetes 2.9Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift PipelinesAffected versions are unavailable in this record.
389 Directory Server · multicluster engine for KubernetesAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4.20Affected versions are unavailable in this record.

Published CVSS scores

10.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
7.2Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
7.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CWE-183Permissive List of Allowed Inputs
CWE-441Unintended Proxy or Intermediary ('Confused Deputy')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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