Skip to content
VulniPulse
Sign in
Medium 2 vendors · 2 advisories

CVE-2026-4438: Invalid DNS hostname returned via gethostbyaddr functions

CVE-2026-4438 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
Medium
CVSS base score
4 (Red Hat)
Weakness
CWE-838
Fixed releases
  • Red Hat: RHSA-2026:19061
Vendor advisories
2 from NetApp, Red Hat
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-4438; each belongs to its advisory, not to every product listed. How records are collected and checked.

How do I fix CVE-2026-4438?

Upgrade to a fixed release named by the vendor:

  • Red Hat: RHSA-2026:19061
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:19061 (`sudo dnf update` / `yum update`). (Red Hat)

Vendor advisories for CVE-2026-4438

NetApp

1 advisory
  • Advisory severityMedium6.5

    Medium [CVE-2026-4437 +1] March 2026 GNU C Library (glibc) Vulnerabilities in NetApp Products

    NTAP-20260410-0017Source published Source updated

    This bulletin covers 2 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.

    Multiple NetApp products incorporate GNU C Library. GNU C Library (glibc) versions 2.34 through 2.43 are susceptible to vulnerabilities which when successfully exploited could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). Active IQ Unified Manager for VMware vSphere: Affected only by CVE-2026-4437. NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. Affected products named by the advisory: E-Series SANtricity OS Controller Software; NetApp HCI Baseboard Management Controller (BMC) - H610S.

    Affected products in this advisory
    • Active IQ Unified Manager for VMware vSphere
    • E-Series SANtricity OS Controller Software
    • NetApp HCI Baseboard Management Controller (BMC) - H610S
    Source-reported affected versions
    • 2.34
    • 2.43
    Source-reported fixed versions
    • E-Series SANtricity OS Controller Software: 11.90R1
    • E-Series SANtricity OS Controller Software: 12.10
    Mitigation guidance
    • Update affected NetApp products to a fixed release: E-Series SANtricity OS Controller Software: 11.90R1, E-Series SANtricity OS Controller Software: 12.10.
    Workarounds
    • E-Series SANtricity OS Controller Software 11.x:<br> Avoid configuring DNS.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityMedium4.0

    Medium [CVE-2026-4438] Invalid DNS hostname returned via gethostbyaddr functions

    CVE-2026-4438Source published

    Invalid DNS hostname returned via gethostbyaddr functions. Red Hat rates this low (CVSS 4). Weakness: CWE-838. Affected package(s): glibc-main, rhui5/haproxy-rhel9:1781525671, insights-proxy/insights-proxy-container-rhel9:1780420428, glibc, rhui5/installer-rhel9:1781525693, costmanagement/costmanagement-metrics-rhel9-operator:1780946239. Resolved in Red Hat advisory RHSA-2026:19061 — update the affected packages (`sudo dnf update`).

    Related products — impact not confirmed
    • Red Hat Enterprise Linux 9
    • Red Hat Enterprise Linux 1
    • glibc-main
    • rhui5/haproxy-rhel9:1781525671

    3 more entries in the full advisory.

    Source-reported affected versions
    • glibc-main-2.42-11.1.hum1
    • rhui5/haproxy-rhel9:1781525671
    • insights-proxy/insights-proxy-container-rhel9:1780420428
    • glibc-0:2.34-270.el9_8

    7 more entries in the full advisory.

    Source-reported fixed versions
    • RHSA-2026:19061
    Mitigation guidance
    • Update the affected package(s) to the fixed version shipped in RHSA-2026:19061 (`sudo dnf update` / `yum update`).
    Full advisory and evidenceOpen source bulletin

References

More NetApp advisories

All NetApp advisories

Get an email when NetApp publishes the next one.

See NetApp's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).

Alert me about NetApp

iPhone and Android apps · New on the App Store

Get alerts for new CVEs on your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery
Download on the App StoreGet CVE alerts on AndroidSee app features