How severe is CVE-2026-114637?

CVE-2026-114637 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-114637 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-114637?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-114637 published?

CVE-2026-114637 was published on 2026-10-22.

CVE-2026-114637

CVE-2026-114637 is a high-severity vulnerability with a CVSS 3.x base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-488.

Key facts

Severity: High (CVSS 3.x base score 8.7)
CVSS v4: 7.0
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-488
Published: 2026-10-22
Last modified: 2026-10-22

Description

Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which fails to pin NTLM/Negotiate-authenticated backend connections to their frontend connection. Unauthenticated clients can be handed a pooled keep-alive backend connection where a victim completed an NTLM or Negotiate handshake, letting them read victim data and act as that victim.

Frequently asked questions

What is CVE-2026-114637?: Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which fails to pin NTLM/Negotiate-authenticated backend connections to their frontend connection. Unauthenticated clients can be handed a pooled keep-alive backend connection where a victim completed an NTLM or Negotiate handshake, letting them read victim data and act as that victim.
How severe is CVE-2026-114637?: CVE-2026-114637 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-114637 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-114637?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-114637 published?: CVE-2026-114637 was published on 2026-10-22.

References

Other CWE-488 vulnerabilities

CVE-2026-16326 — Critical (CVSS 10.0): In consul-mcp-server, versions 0.1.0 up to 0.1.3 did not properly isolate session state in stateless mode, which may…
CVE-2026-16498 — Critical (CVSS 10.0): The terraform-mcp-server before version 1.1.0 is vulnerable to a cross-tenant credential reuse issue in the…
CVE-2026-19931 — Critical (CVSS 9.8): A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication,…
CVE-2025-47928 — Critical (CVSS 9.1): Spotipy is a Python library for the Spotify Web API. As of commit 4f5759dbfb4506c7b6280572a4db1aabc1ac778d, using…
CVE-2024-27455 — Critical (CVSS 9.1): In the Bentley ALIM Web application, certain configuration settings can cause exposure of a user's ALIM session token…
CVE-2026-86492 — High (CVSS 8.5): In JetBrains YouTrack before 2026.2.18634 a shared token cache allowed cross-tenant theft of GitHub App installation…

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