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    CVE-2026-27651

    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.

    Published:Mar 24, 2026
    Last Modified:Mar 30, 2026
    EPS:Mar 24, 2026
    EPSS Score:0.00039
    CVSS Score:7.5

    Affected Products

    Vendor
    F5
    Product
    Nginx Open Source
    Vendor
    F5
    Product
    Nginx Plus

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-60005 (CVSS 8.8) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_slice_module module. When the slice dire…
    CVE-2026-56434 (CVSS 8.3) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability ma…
    CVE-2026-42533 (CVSS 9.2) — A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a stri…
    CVE-2026-42530 (CVSS 9.2) — NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured t…
    CVE-2026-42055 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module…
    CVE-2026-48142 (CVSS 6.3) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When content is s…
    CVE-2026-9256 (CVSS 9.2) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerabilit…
    CVE-2026-42926 (CVSS 6.3) — When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses…
    CVE-2026-40460 (CVSS 6.9) — When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to …
    CVE-2026-42934 (CVSS 6.3) — NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, sou…

    References

    https://my.f5.com/manage/s/article/K000160383
    https://access.redhat.com/errata/RHSA-2026:10065
    https://access.redhat.com/errata/RHSA-2026:13634
    https://access.redhat.com/errata/RHSA-2026:13680
    https://access.redhat.com/errata/RHSA-2026:13839
    https://access.redhat.com/errata/RHSA-2026:14836
    https://access.redhat.com/errata/RHSA-2026:15942
    https://access.redhat.com/errata/RHSA-2026:15943
    https://access.redhat.com/errata/RHSA-2026:15945
    https://access.redhat.com/errata/RHSA-2026:15966
    https://access.redhat.com/errata/RHSA-2026:6906
    https://access.redhat.com/errata/RHSA-2026:6907
    https://access.redhat.com/errata/RHSA-2026:6923
    https://access.redhat.com/errata/RHSA-2026:7002
    https://access.redhat.com/errata/RHSA-2026:7343
    https://access.redhat.com/errata/RHSA-2026:8346
    https://access.redhat.com/security/cve/CVE-2026-27651
    https://bugzilla.redhat.com/show_bug.cgi?id=2450791
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27651.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High