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    CVE-2018-8777

    In Ruby before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1, an attacker can pass a large HTTP request with a crafted header to WEBrick server or a crafted body to WEBrick server/handler and cause a denial of service (memory consumption).

    Published:Mar 28, 2018
    Last Modified:Nov 21, 2024
    EPS:Apr 3, 2018
    EPSS Score:0.01256
    CVSS Score:7.5

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Software Collections
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Ruby-lang
    Product
    Ruby

    Exploits

    No exploit reference

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    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
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    References

    http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
    http://www.securityfocus.com/bid/103683
    http://www.securitytracker.com/id/1042004
    https://access.redhat.com/errata/RHSA-2018:3729
    https://access.redhat.com/errata/RHSA-2018:3730
    https://access.redhat.com/errata/RHSA-2018:3731
    https://access.redhat.com/errata/RHSA-2019:2028
    https://access.redhat.com/errata/RHSA-2020:0542
    https://access.redhat.com/errata/RHSA-2020:0591
    https://access.redhat.com/errata/RHSA-2020:0663
    https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html
    https://lists.debian.org/debian-lts-announce/2018/04/msg00024.html
    https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
    https://usn.ubuntu.com/3685-1/
    https://www.debian.org/security/2018/dsa-4259
    https://www.ruby-lang.org/en/news/2018/03/28/large-request-dos-in-webrick-cve-2018-8777/
    https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-2-10-released/
    https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-3-7-released/
    https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-4-4-released/
    https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-5-1-released/
    http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html
    http://www.securityfocus.com/bid/103683
    http://www.securitytracker.com/id/1042004
    https://access.redhat.com/errata/RHSA-2018:3729
    https://access.redhat.com/errata/RHSA-2018:3730
    https://access.redhat.com/errata/RHSA-2018:3731
    https://access.redhat.com/errata/RHSA-2019:2028
    https://access.redhat.com/errata/RHSA-2020:0542
    https://access.redhat.com/errata/RHSA-2020:0591
    https://access.redhat.com/errata/RHSA-2020:0663
    https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html
    https://lists.debian.org/debian-lts-announce/2018/04/msg00024.html
    https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
    https://usn.ubuntu.com/3685-1/
    https://www.debian.org/security/2018/dsa-4259
    https://www.ruby-lang.org/en/news/2018/03/28/large-request-dos-in-webrick-cve-2018-8777/
    https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-2-10-released/
    https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-3-7-released/
    https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-4-4-released/
    https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-5-1-released/

    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