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Fencer Vulns
high 7.5

CVE-2019-9516 in the critical feed json

Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service

published 2019-08-13 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-18888

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
57.5%
EPSS 57.5% chance of exploitation in 30 days, percentile 99%
public exploits
0
none known

Summary

Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.

Patch / fix

  • mcafee web_gateway 7.7.2.24, 7.8.2.13, 8.2.0
  • f5 nginx 1.16.1
  • nodejs node.js 8.16.1, 10.16.3, 12.8.1
  • nginx Debian 14, Debian 13, Debian 12 1.14.2-3

debian advisories DEBIAN-CVE-2019-9516

  • nginx Ubuntu 16.04 LTS 1.10.3-0ubuntu0.16.04.4
  • nginx Ubuntu 18.04 LTS 1.14.0-0ubuntu1.4

ubuntu advisories UBUNTU-CVE-2019-9516

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

  • npm RHEL 8 1:6.9.0-1.10.16.3.2.module+el8.0.0+4214+49953fda
  • nodejs RHEL 8 1:10.16.3-2.module+el8.0.0+4214+49953fda
  • nodejs-nodemon RHEL 8 1.18.3-1.module+el8+2632+6c5111ed
  • nodejs-packaging RHEL 8 17-3.module+el8+2873+aa7dfd9a
  • nginx RHEL 8 1:1.14.1-9.module+el8.0.0+4108+af250afe
  • nginx-mod-mail RHEL 8 1:1.14.1-9.module+el8.0.0+4108+af250afe
  • nginx-filesystem RHEL 8 1:1.14.1-9.module+el8.0.0+4108+af250afe
  • nginx-mod-stream RHEL 8 1:1.14.1-9.module+el8.0.0+4108+af250afe

red hat advisories RHSA-2019:2925RHSA-2019:2799RHSA-2019:2955RHSA-2019:3932RHSA-2019:3933RHSA-2019:2939

  • nodejs12 SLE Module for Web and Scripting 12 12.13.0-1.3.1
  • nginx SLE Module for Server Applications 15 1.14.2-3.6.1
  • nginx SLE Module for Server Applications 15 SP1 1.14.2-6.3.1
  • nodejs8 SLE Module for Web and Scripting 15 SP1, SLE Module for Web and Scripting 15 8.16.1-3.20.1
  • nodejs10 SLE Module for Web and Scripting 15 SP1, SLE Module for Web and Scripting 15, SLE Module for Web and Scripting 12 10.16.3-1.12.1
  • firefox-atk SLES 11 SP4-LTSS 2.26.1-2.8.4
  • mozilla-nss SLES 11 SP4-LTSS 3.45-38.9.3
  • firefox-gtk3 SLES 11 SP4-LTSS 3.10.9-2.15.3

suse advisories SUSE-SU-2019:14246-1SUSE-SU-2020:0059-1SUSE-SU-2019:2559-1SUSE-SU-2019:2309-1SUSE-SU-2019:2260-1SUSE-SU-2019:2259-1

  • nginx openSUSE Tumbleweed 1.21.3-1.4
  • nginx openSUSE Leap 15.0 1.14.2-lp150.2.11.1
  • nginx openSUSE Leap 15.1 1.14.2-lp151.4.3.1
  • nodejs8 openSUSE Leap 15.1, openSUSE Leap 15.0 8.16.1-lp151.2.6.1
  • nodejs10 openSUSE Leap 15.1, openSUSE Leap 15.0 10.16.3-lp151.2.6.1

opensuse advisories openSUSE-SU-2024:11092-1openSUSE-SU-2019:2264-1openSUSE-SU-2019:2120-1openSUSE-SU-2019:2115-1openSUSE-SU-2019:2114-1

  • nodejs-nodemon AlmaLinux 8 1.18.3-1.module_el8.3.0+2023+d2377ea3
  • nodejs-nodemon AlmaLinux 8 1.18.3-1.module_el8.3.0+2047+b07ac28e
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.4.0+2224+b07ac28e
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.4.0+2521+c668cc9f
  • nodejs-packaging AlmaLinux 8 17-3.module_el8.3.0+2023+d2377ea3
  • nginx AlmaLinux 8 1:1.14.1-9.module_el8.5.0+34+dc1cfba5.alma
  • nginx AlmaLinux 8 1:1.14.1-9.module_el8.3.0+2165+af250afe.alma
  • nginx AlmaLinux 8 1:1.14.1-9.module_el8.4.0+2221+af250afe.alma

almalinux advisories ALSA-2019:2925ALSA-2019:2799

  • nodejs-nodemon Rocky Linux 8 1.18.3-1.module+el8.3.0+101+f84c7154
  • nodejs-packaging Rocky Linux 8 17-3.module+el8.3.0+101+f84c7154
  • nginx Rocky Linux 8 1:1.14.1-9.module+el8.4.0+542+81547229

rocky linux advisories RLSA-2019:2925RLSA-2019:2799

  • nginx Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 1.16.1-r0
  • nginx Alpine 3.8 1.14.1-r1
  • nginx Alpine 3.9 1.14.1-r2
  • nodejs Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 10.16.3-r0

alpine advisories ALPINE-CVE-2019-9516

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

  • nginx-mainline Arch Linux 1.17.3-1
  • nginx Arch Linux 1.16.1-1

arch linux advisories AVG-1022AVG-1023

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-2019-9516 updated cvss 6.5

HTTP/2: 0-length headers lead to denial of service

  • Red Hat 3scale API Management Platform 2 nginx Red Hat AMQ Broker 7 jetty
    affected: workaround, no fix available
  • Red Hat JBoss Enterprise Web Server 3 httpd Red Hat JBoss Fuse 6 undertow undertow Red Hat OpenShift Application Runtimes rhoar-nodejs rhoar-nodejs
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Quay v3 quay3/clair-jwt v2.0.9-7
    fixed: vendor fix RHSA-2019:2966
  • Red Hat AMQ
    fixed: vendor fix RHSA-2020:0922
  • Red Hat AMQ 7.4.3
    fixed: vendor fix RHSA-2020:1445
  • Red Hat Enterprise Linux AppStream (v. 8) nginx 1.14.1-9.module+el8.0.0+4108+af250afe, nodejs 10.16.3-2.module+el8.0.0+4214+49953fda, nodejs-packaging 17-3.module+el8+2873+aa7dfd9a, nodejs-nodemon 1.18.3-1.module+el8+2632+6c5111ed, npm 6.9.0-1.10.16.3.2.module+el8.0.0+4214+49953fda, nginx-mod-mail 1.14.1-9.module+el8.0.0+4108+af250afe, +6 more
    fixed: vendor fix RHSA-2019:2799
  • Red Hat Fuse 7.6.0
    fixed: vendor fix RHSA-2020:0983
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2019:2950
show 4 more
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el6, jbcs-httpd24-brotli 1.0.6-7.jbcs.el6, jbcs-httpd24-curl 7.64.1-14.jbcs.el6, jbcs-httpd24-httpd 2.4.29-41.jbcs.el6, jbcs-httpd24-httpd 2.4.37-33.jbcs.el6, jbcs-httpd24-jansson 2.11-20.jbcs.el6, +34 more
    fixed: vendor fix RHSA-2019:3932
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-apr 1.6.3-63.jbcs.el7, jbcs-httpd24-brotli 1.0.6-7.jbcs.el7, jbcs-httpd24-curl 7.64.1-14.jbcs.el7, jbcs-httpd24-httpd 2.4.29-41.jbcs.el7, jbcs-httpd24-httpd 2.4.37-33.jbcs.el7, jbcs-httpd24-jansson 2.11-20.jbcs.el7, +34 more
    fixed: vendor fix RHSA-2019:2946
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-nginx110-nginx 1.10.2-9.el6.1, rh-nginx110-nginx-mod-mail 1.10.2-9.el6.1, rh-nginx110-nginx-mod-stream 1.10.2-9.el6.1, rh-nginx110-nginx-mod-http-perl 1.10.2-9.el6.1, rh-nginx110-nginx-mod-http-xslt-filter 1.10.2-9.el6.1, rh-nginx110-nginx-mod-http-image-filter 1.10.2-9.el6.1 Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +22 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) rh-nginx110-nginx 1.10.2-9.el7.1, rh-nginx112-nginx 1.12.1-3.el7.1, rh-nginx114-nginx 1.14.1-1.el7.1, rh-nginx110-nginx-mod-mail 1.10.2-9.el7.1, rh-nginx112-nginx-mod-mail 1.12.1-3.el7.1, rh-nginx114-nginx-mod-mail 1.14.1-1.el7.1, +12 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +22 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +22 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +22 more
    +2 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-nginx110-nginx 1.10.2-9.el6.1, rh-nginx110-nginx-mod-mail 1.10.2-9.el6.1, rh-nginx110-nginx-mod-stream 1.10.2-9.el6.1, rh-nginx110-nginx-mod-http-perl 1.10.2-9.el6.1, rh-nginx110-nginx-mod-http-xslt-filter 1.10.2-9.el6.1, rh-nginx110-nginx-mod-http-image-filter 1.10.2-9.el6.1 Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-nodejs8 3.0-5.el7, rh-nodejs10 3.2-3.el7, rh-nodejs8-runtime 3.0-5.el7, rh-nodejs10-runtime 3.2-3.el7, rh-nodejs8-scldevel 3.0-5.el7, rh-nodejs10-scldevel 3.2-3.el7, +22 more
    fixed: vendor fix RHSA-2019:2745
  • 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 AMQ Broker 7 netty netty Red Hat Ansible Tower 3 nginx Red Hat Enterprise Linux 8 nginx, nghttp2, mod_http2, libnghttp2, nginx-mod-mail, nginx-filesystem, +5 more Red Hat JBoss Data Grid 7 undertow undertow Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb
    +11 more products
    Red Hat JBoss Enterprise Application Platform 7 undertow-core Red Hat JBoss Web Server 5 nghttp2 Red Hat OpenShift Application Runtimes undertow undertow Red Hat OpenShift Container Platform 3.9 nodejs, atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, +9 more Red Hat OpenShift Container Platform 3.10 nodejs, atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, +8 more Red Hat OpenShift Container Platform 3.11 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +7 more Red Hat OpenShift Container Platform 4 openshift, openshift-clients, openshift-kubelet, openshift-hyperkube, openshift-kube-apiserver, openshift-kube-scheduler, +2 more Red Hat Process Automation 7 undertow undertow Red Hat Quay 3 nodejs Red Hat Single Sign-On 7 undertow undertow Red Hat Software Collections httpd24-httpd, httpd24-mod_md, httpd24-mod_ssl, httpd24-nghttp2, httpd24-mod_ldap, rh-nginx116-nginx, +10 more
    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

57.46% chance of exploitation in the next 30 days, higher than 99% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 6.8 AV:N/AC:L/Au:S/C:N/I:N/A:C

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling
Technology feeds

References

Sources

Fencer Vulns 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.