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Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2026-27651

CVE-2026-27651: 2 tracked advisory records across F5, 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.

NVD detail CVE.org

Vendor advisory comparison

F5

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-27651] NGINX ngx_mail_auth_http_module vulnerability

    CVE-2026-27651Source published Source updated

    When the ngx_mail_auth_http_module module is enabled on NGINX Plus or NGINX Open Source, undisclosed requests can cause worker processes to terminate. This issue may occur when (1) CRAM-MD5 or APOP authentication is enabled, and (2) the authentication server permits retry by returning the Auth-Wait response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

    Affected products in this advisory
    • NGINX Open Source
    • NGINX Plus
    Source-reported affected versions
    • NGINX Open Source 1.29.0 before 1.29.7
    • NGINX Open Source 0.5.15 before 1.28.3
    • NGINX Plus R36 before R36 P3
    • NGINX Plus R35 before R35 P2

    3 more entries in the full advisory.

    Source-reported fixed versions
    • 1.29.7
    • 1.28.3
    • R36 P3
    • R35 P2

    1 more entries in the full advisory.

    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-27651] Denial of Service via undisclosed requests when ngx_mail_auth_http_module is enabled

    CVE-2026-27651Source published

    Denial of Service via undisclosed requests when ngx_mail_auth_http_module is enabled. Red Hat rates this important (CVSS 7.5). Weakness: CWE-476. Affected package(s): nginx-main, nginx, nginx:1.26, nginx:1.24, rhui5/cds-rhel9:1776868774, rhui5/rhua-rhel9:1776868842. Resolved in Red Hat advisory RHSA-2026:6906 — update the affected packages (`sudo dnf update`).

    Affected products in this advisory
    • NGINX Open Source
    • NGINX Plus
    • Red Hat Enterprise Linux 10.0 Extended Update Support
    • Red Hat Enterprise Linux 8

    6 more entries in the full advisory.

    Source-reported affected versions
    • nginx-main-1.30.0-1.hum1
    • nginx-2:1.26.3-1.el10_0.8
    • nginx-2:1.20.1-24.el9_7.2
    • nginx:1.26-9060020260504154614.9

    8 more entries in the full advisory.

    Source-reported fixed versions
    • RHSA-2026:6906
    Mitigation guidance
    • Update the affected package(s) to the fixed version shipped in RHSA-2026:6906 (`sudo dnf update` / `yum update`).
    Full advisory and evidenceOpen source bulletin

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