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    2 vulnerabilities found for Red Hat JBoss Web Server 7 by Red Hat

    CVE-2026-76166 (GCVE-0-2026-76166)

    Vulnerability from nvd – Published: 2026-08-19 10:01 – Updated: 2026-08-19 10:01
    VLAI
    Title
    Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram
    Summary
    A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted UDP multicast datagram with a valid HTTP status line and a "Server:" header but without the "Date:", "Digest:", and "Sequence:" headers triggers a NullPointerException in verifyDigest() that is not caught by the worker thread's exception handler. This causes the advertise listener thread to terminate permanently. The failure is silent (isListening() continues to return true) and persists until the node is restarted. The crash occurs before the AdvertiseSecurityKey comparison, so deployments with a configured security key are still affected.
    Severity
    4.3 (Medium)
    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
    CWE
    • CWE-476 - NULL Pointer Dereference
    Assigner
    References
    URL Tags
    https://access.redhat.com/security/cve/CVE-2026-76166 vdb-entryx_refsource_REDHAT
    https://bugzilla.redhat.com/show_bug.cgi?id=2510883 issue-trackingx_refsource_REDHAT
    Impacted products
    Date Public
    2026-08-04 00:00
    Credits
    Red Hat would like to thank Kien Pham (Ninh Thanh Cyber Security (NTCS)) and Ta Duc Thien (Ninh Thanh Cyber Security (NTCS)) for reporting this issue.
    Show details on NVD website
    To clipboard 

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    CVE-2026-76166 (GCVE-0-2026-76166)

    Vulnerability from cvelistv5 – Published: 2026-08-19 10:01 – Updated: 2026-08-19 10:01
    VLAI
    Title
    Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram
    Summary
    A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted UDP multicast datagram with a valid HTTP status line and a "Server:" header but without the "Date:", "Digest:", and "Sequence:" headers triggers a NullPointerException in verifyDigest() that is not caught by the worker thread's exception handler. This causes the advertise listener thread to terminate permanently. The failure is silent (isListening() continues to return true) and persists until the node is restarted. The crash occurs before the AdvertiseSecurityKey comparison, so deployments with a configured security key are still affected.
    Severity
    4.3 (Medium)
    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
    CWE
    • CWE-476 - NULL Pointer Dereference
    Assigner
    References
    URL Tags
    https://access.redhat.com/security/cve/CVE-2026-76166 vdb-entryx_refsource_REDHAT
    https://bugzilla.redhat.com/show_bug.cgi?id=2510883 issue-trackingx_refsource_REDHAT
    Impacted products
    Date Public
    2026-08-04 00:00
    Credits
    Red Hat would like to thank Kien Pham (Ninh Thanh Cyber Security (NTCS)) and Ta Duc Thien (Ninh Thanh Cyber Security (NTCS)) for reporting this issue.
    Show details on NVD website
    To clipboard 

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