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Fencer Intel
medium 5.3

CVE-2018-16843 json

nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive memory consumption.

published 8y ago modified 4mo ago also EUVD-2018-8639

cvss
5.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
48.0%
EPSS 48.0% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive memory consumption. This issue affects nginx compiled with the ngx_http_v2_module (not compiled by default) if the 'http2' option of the 'listen' directive is used in a configuration file.

Patch / fix

  • f5 nginx 1.14.1, 1.15.6
  • apple xcode 13.0
  • nginx Debian 14, Debian 13, Debian 12 1.14.1-1

debian advisories DEBIAN-CVE-2018-16843

  • nginx Ubuntu 16.04 LTS 1.10.3-0ubuntu0.16.04.3
  • nginx Ubuntu 18.04 LTS 1.14.0-0ubuntu1.2

ubuntu advisories UBUNTU-CVE-2018-16843

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rh-nginx114-nginx RHEL 3 SOFTWARE_COLLECTIONS 1:1.14.1-1.el7
  • rh-nginx114-nginx-mod-mail RHEL 3 SOFTWARE_COLLECTIONS 1:1.14.1-1.el7
  • rh-nginx114-nginx-mod-stream RHEL 3 SOFTWARE_COLLECTIONS 1:1.14.1-1.el7
  • rh-nginx114-nginx-mod-http-perl RHEL 3 SOFTWARE_COLLECTIONS 1:1.14.1-1.el7
  • rh-nginx114-nginx-mod-http-xslt-filter RHEL 3 SOFTWARE_COLLECTIONS 1:1.14.1-1.el7
  • rh-nginx114-nginx-mod-http-image-filter RHEL 3 SOFTWARE_COLLECTIONS 1:1.14.1-1.el7
  • rh-nginx112-nginx RHEL 3 SOFTWARE_COLLECTIONS 1:1.12.1-2.el7.1
  • rh-nginx112-nginx-mod-mail RHEL 3 SOFTWARE_COLLECTIONS 1:1.12.1-2.el7.1

red hat advisories RHSA-2018:3681RHSA-2018:3680RHSA-2018:3653

  • nginx SLE Module for Server Applications 15 SP1 1.14.2-6.3.1
  • nginx SLE Module for Server Applications 15 1.14.2-3.3.1

suse advisories SUSE-SU-2019:2309-1SUSE-SU-2019:0334-1

  • nginx openSUSE Tumbleweed 1.21.3-1.4
  • nginx openSUSE Leap 15.1 1.14.2-lp151.4.3.1
  • nginx Package Hub 12, openSUSE Leap 15.0 1.14.2-16.1

opensuse advisories openSUSE-SU-2024:11092-1openSUSE-SU-2019:2120-1openSUSE-SU-2019:0195-1

  • nginx Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 1.14.1-r0
  • nginx Alpine 3.6 1.12.2-r2
  • nginx Alpine 3.7 1.12.1-r4

alpine advisories ALPINE-CVE-2018-16843

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2018-16843 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16843 updated cvss 5.3

nginx: Excessive memory consumption via flaw in HTTP/2 implementation

  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-nginx110-nginx 1.10.2-8.el6.1, rh-nginx110-nginx-mod-mail 1.10.2-8.el6.1, rh-nginx110-nginx-mod-stream 1.10.2-8.el6.1, rh-nginx110-nginx-mod-http-perl 1.10.2-8.el6.1, rh-nginx110-nginx-mod-http-xslt-filter 1.10.2-8.el6.1, rh-nginx110-nginx-mod-http-image-filter 1.10.2-8.el6.1 Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-nginx114-nginx 1.14.1-1.el7, rh-nginx110-nginx 1.10.2-8.el7.1, rh-nginx112-nginx 1.12.1-2.el7.1, rh-nginx114-nginx-mod-mail 1.14.1-1.el7, rh-nginx110-nginx-mod-mail 1.10.2-8.el7.1, rh-nginx112-nginx-mod-mail 1.12.1-2.el7.1, +12 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) rh-nginx114-nginx 1.14.1-1.el7, rh-nginx110-nginx 1.10.2-8.el7.1, rh-nginx112-nginx 1.12.1-2.el7.1, rh-nginx114-nginx-mod-mail 1.14.1-1.el7, rh-nginx110-nginx-mod-mail 1.10.2-8.el7.1, rh-nginx112-nginx-mod-mail 1.12.1-2.el7.1, +12 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) rh-nginx114-nginx 1.14.1-1.el7, rh-nginx110-nginx 1.10.2-8.el7.1, rh-nginx112-nginx 1.12.1-2.el7.1, rh-nginx114-nginx-mod-mail 1.14.1-1.el7, rh-nginx110-nginx-mod-mail 1.10.2-8.el7.1, rh-nginx112-nginx-mod-mail 1.12.1-2.el7.1, +12 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-nginx114-nginx 1.14.1-1.el7, rh-nginx110-nginx 1.10.2-8.el7.1, rh-nginx112-nginx 1.12.1-2.el7.1, rh-nginx114-nginx-mod-mail 1.14.1-1.el7, rh-nginx110-nginx-mod-mail 1.10.2-8.el7.1, rh-nginx112-nginx-mod-mail 1.12.1-2.el7.1, +12 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-nginx110-nginx 1.10.2-8.el6.1, rh-nginx110-nginx-mod-mail 1.10.2-8.el6.1, rh-nginx110-nginx-mod-stream 1.10.2-8.el6.1, rh-nginx110-nginx-mod-http-perl 1.10.2-8.el6.1, rh-nginx110-nginx-mod-http-xslt-filter 1.10.2-8.el6.1, rh-nginx110-nginx-mod-http-image-filter 1.10.2-8.el6.1
    +1 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-nginx114-nginx 1.14.1-1.el7, rh-nginx110-nginx 1.10.2-8.el7.1, rh-nginx112-nginx 1.12.1-2.el7.1, rh-nginx114-nginx-mod-mail 1.14.1-1.el7, rh-nginx110-nginx-mod-mail 1.10.2-8.el7.1, rh-nginx112-nginx-mod-mail 1.12.1-2.el7.1, +12 more
    fixed: vendor fix RHSA-2018:3653
  • Red Hat CloudForms Management Engine 5 nginx, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, nginx-mod-http-perl, +3 more Red Hat 3scale API Management Platform 2 openresty openresty Red Hat Ansible Tower 3 nginx Red Hat Enterprise Linux 8 nginx, nginx-mod-mail, nginx-filesystem, nginx-mod-stream, nginx-all-modules, nginx-mod-http-perl, +2 more Red Hat Software Collections rh-nginx18-nginx
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

47.99% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • [UNKNOWN] nginx

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.