CVE-2026-48491
CVE-2026-48491: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityCritical9.1
Critical [CVE-2026-48491] Unauthorized access due to mutual TLS bypass
CVE-2026-48491Source published Source updated
Traefik is an HTTP reverse proxy and load balancer. From 3.7.0 until 3.7.3, there is a high severity vulnerability in Traefik's domain-fronting protection (SNICheck) that allows an unauthenticated client to bypass mutual TLS enforced through wildcard router TLSOptions. When a router uses a wildcard host rule such as Host(*.example.com) with stricter TLS options (for example RequireAndVerifyClientCert), SNICheck resolves the TLS options for the HTTP Host header using exact map lookups only and never applies wildcard matching. If another permissive SNI is served on the same entrypoint, an attacker can complete the TLS handshake under the permissive options and then send an HTTP Host header targeting the wildcard-protected backend, reaching it without presenting a client certificate. This…
- Affected products in this advisory
- Red Hat OpenShift Dev Spaces 3.30
- Source-reported affected versions
- 3.7.0
- Source-reported fixed versions
- 3.7.3
- devspaces/traefik-rhel9:1787756799
- RHSA-2026:62260
- Mitigation guidance
- To mitigate this issue, avoid configuring Traefik with wildcard host rules (e.g., Host(*.example.com)) alongside strict TLS options such as RequireAndVerifyClientCert on entrypoints that also serve permissive SNI configurations. Alternatively, restrict network access to Traefik's entrypoints to trusted networks only, thereby limiting potential exposure.
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