CVE-2020-1935 json
Potential HTTP request smuggling in Apache Tomcat
published 6y ago modified last mo. also BIT-tomcat-2020-1935 , EUVD-2020-0311 , GHSA-qxf4-chvg-4r8r
- cvss
- 4.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 9.4%
- EPSS 9.4% chance of exploitation in 30 days, percentile 95%
- public exploits
- 0
- none known
Summary
In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.
Patch / fix
- maven org.apache.tomcat.embed:tomcat-embed-core 7.0.100, 8.5.51, 9.0.31
- maven org.apache.tomcat:tomcat 7.0.100, 8.5.51, 9.0.31
- bitnami tomcat 7.0.100, 8.5.51, 9.0.31
- tomcat9 Debian 14, Debian 13, Debian 12 9.0.31-1
debian advisories DEBIAN-CVE-2020-1935
- tomcat8 Ubuntu 16.04 LTS 8.0.32-1ubuntu1.13
ubuntu advisories UBUNTU-CVE-2020-1935
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
- jss RHEL 8 4.7.3-1.module+el8.3.0+8058+d5cd4219
- xsom RHEL 8 0-19.20110809svn.module+el8.1.0+3366+6dfb954c
- slf4j RHEL 8 1.7.25-4.module+el8.1.0+3366+6dfb954c
- pki-ca RHEL 8 10.9.4-1.module+el8.3.0+8058+d5cd4219
- ldapjdk RHEL 8 4.22.0-1.module+el8.3.0+6784+6e1e4c62
- pki-kra RHEL 8 10.9.4-1.module+el8.3.0+8058+d5cd4219
- stax-ex RHEL 8 1.7.7-8.module+el8.2.0+5723+4574fbff
- bea-stax RHEL 8 1.2.0-16.module+el8.1.0+3366+6dfb954c
red hat advisories RHSA-2020:4847RHSA-2021:1030RHSA-2021:0882RHSA-2020:1520RHSA-2020:3303RHSA-2020:5020
- tomcat SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES 12 SP3-LTSS +8 more 8.0.53-29.37.1
- tomcat SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +1 more 9.0.31-3.25.1
- tomcat SLE Module for Web and Scripting 15 SP1 9.0.31-4.22.1
- tomcat SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 9.0.31-3.42.2
suse advisories SUSE-SU-2020:2611-1SUSE-SU-2020:0632-1SUSE-SU-2020:0631-1SUSE-SU-2020:0598-1
- tomcat openSUSE Tumbleweed 9.0.36-8.4
- tomcat10 openSUSE Tumbleweed 10.1.14-1.1
- tomcat openSUSE Leap 15.1 9.0.31-lp151.3.12.1
opensuse advisories openSUSE-SU-2024:11468-1openSUSE-SU-2024:13441-1openSUSE-SU-2020:0345-1
- xsom Rocky Linux 8 0-19.20110809svn.module+el8.3.0+53+ea062990
- slf4j Rocky Linux 8 1.7.25-4.module+el8.5.0+697+f586bb30
- slf4j Rocky Linux 8 1.7.25-4.module+el8.3.0+74+855e3f5d
- slf4j Rocky Linux 8 1.7.25-4.module+el8.3.0+133+b8b54b58
- ldapjdk Rocky Linux 8 4.22.0-1.module+el8.4.0+418+b7ae1d4a
- stax-ex Rocky Linux 8 1.7.7-8.module+el8.3.0+53+ea062990
- bea-stax Rocky Linux 8 1.2.0-16.module+el8.3.0+53+ea062990
- resteasy Rocky Linux 8 3.0.26-3.module+el8.3.0+53+ea062990
rocky linux advisories RLSA-2020:4847
Is CVE-2020-1935 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-1935 updated cvss 4.3
tomcat: Mishandling of Transfer-Encoding header allows for HTTP request smuggling
-
Red Hat Enterprise Linux 5 tomcat5 Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb Red Hat JBoss Fuse 6 tomcat Red Hat OpenStack Platform 10 (Newton) opendaylightaffected: workaround, no fix planned “Out of support scope”
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Red Hat OpenStack Platform 13 (Queens) opendaylightaffected: workaround, no fix planned “Will not fix”
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Red Hat Enterprise Linux AppStream (v. 8) jss 4.7.3-1.module+el8.3.0+8058+d5cd4219, slf4j 1.7.25-4.module+el8.1.0+3366+6dfb954c, pki-ca 10.9.4-1.module+el8.3.0+8058+d5cd4219, stax-ex 1.7.7-8.module+el8.2.0+5723+4574fbff, velocity 1.7-24.module+el8.1.0+3366+6dfb954c, ldapjdk 4.22.0-1.module+el8.3.0+6784+6e1e4c62, +44 morefixed: vendor fix RHSA-2020:4847
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Red Hat Enterprise Linux Client (v. 7) tomcat 7.0.76-16.el7_9, tomcat-servlet-3.0-api 7.0.76-16.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) tomcat 7.0.76-16.el7_9, tomcat-lib 7.0.76-16.el7_9, tomcat-jsvc 7.0.76-16.el7_9, tomcat-javadoc 7.0.76-16.el7_9, tomcat-webapps 7.0.76-16.el7_9, tomcat-el-2.2-api 7.0.76-16.el7_9, +3 morefixed: vendor fix RHSA-2020:5020
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Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) tomcat 7.0.76-11.el7_6, tomcat-servlet-3.0-api 7.0.76-11.el7_6fixed: vendor fix RHSA-2021:0882
-
Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) tomcat 7.0.76-12.el7_7, tomcat-servlet-3.0-api 7.0.76-12.el7_7fixed: vendor fix RHSA-2021:1030
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Red Hat Enterprise Linux ComputeNode Optional (v. 7) tomcat 7.0.76-16.el7_9, tomcat-lib 7.0.76-16.el7_9, tomcat-jsvc 7.0.76-16.el7_9, tomcat-javadoc 7.0.76-16.el7_9, tomcat-webapps 7.0.76-16.el7_9, tomcat-el-2.2-api 7.0.76-16.el7_9, +3 morefixed: vendor fix RHSA-2020:5020
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Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) tomcat 7.0.76-11.el7_6, tomcat-lib 7.0.76-11.el7_6, tomcat-jsvc 7.0.76-11.el7_6, tomcat-javadoc 7.0.76-11.el7_6, tomcat-webapps 7.0.76-11.el7_6, tomcat-el-2.2-api 7.0.76-11.el7_6, +3 morefixed: vendor fix RHSA-2021:0882
show 16 moreshow fewer
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Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) tomcat 7.0.76-12.el7_7, tomcat-lib 7.0.76-12.el7_7, tomcat-jsvc 7.0.76-12.el7_7, tomcat-javadoc 7.0.76-12.el7_7, tomcat-webapps 7.0.76-12.el7_7, tomcat-el-2.2-api 7.0.76-12.el7_7, +3 morefixed: vendor fix RHSA-2021:1030
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Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) tomcat 7.0.76-11.el7_6, tomcat-lib 7.0.76-11.el7_6, tomcat-webapps 7.0.76-11.el7_6, tomcat-el-2.2-api 7.0.76-11.el7_6, tomcat-jsp-2.2-api 7.0.76-11.el7_6, tomcat-admin-webapps 7.0.76-11.el7_6, +1 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) tomcat 7.0.76-11.el7_6, tomcat-lib 7.0.76-11.el7_6, tomcat-jsvc 7.0.76-11.el7_6, tomcat-javadoc 7.0.76-11.el7_6, tomcat-webapps 7.0.76-11.el7_6, tomcat-el-2.2-api 7.0.76-11.el7_6, +3 morefixed: vendor fix RHSA-2021:0882
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Red Hat Enterprise Linux Server (v. 7) tomcat 7.0.76-16.el7_9, tomcat-lib 7.0.76-16.el7_9, tomcat-webapps 7.0.76-16.el7_9, tomcat-el-2.2-api 7.0.76-16.el7_9, tomcat-jsp-2.2-api 7.0.76-16.el7_9, tomcat-admin-webapps 7.0.76-16.el7_9, +1 morefixed: vendor fix RHSA-2020:5020
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Red Hat Enterprise Linux Server EUS (v. 7.6) tomcat 7.0.76-11.el7_6, tomcat-lib 7.0.76-11.el7_6, tomcat-webapps 7.0.76-11.el7_6, tomcat-el-2.2-api 7.0.76-11.el7_6, tomcat-jsp-2.2-api 7.0.76-11.el7_6, tomcat-admin-webapps 7.0.76-11.el7_6, +1 morefixed: vendor fix RHSA-2021:0882
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Red Hat Enterprise Linux Server EUS (v. 7.7) tomcat 7.0.76-12.el7_7, tomcat-lib 7.0.76-12.el7_7, tomcat-webapps 7.0.76-12.el7_7, tomcat-el-2.2-api 7.0.76-12.el7_7, tomcat-jsp-2.2-api 7.0.76-12.el7_7, tomcat-admin-webapps 7.0.76-12.el7_7, +1 morefixed: vendor fix RHSA-2021:1030
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Red Hat Enterprise Linux Server Optional (v. 7) tomcat 7.0.76-16.el7_9, tomcat-lib 7.0.76-16.el7_9, tomcat-jsvc 7.0.76-16.el7_9, tomcat-javadoc 7.0.76-16.el7_9, tomcat-webapps 7.0.76-16.el7_9, tomcat-el-2.2-api 7.0.76-16.el7_9, +3 morefixed: vendor fix RHSA-2020:5020
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Red Hat Enterprise Linux Server Optional EUS (v. 7.6) tomcat 7.0.76-11.el7_6, tomcat-lib 7.0.76-11.el7_6, tomcat-jsvc 7.0.76-11.el7_6, tomcat-javadoc 7.0.76-11.el7_6, tomcat-webapps 7.0.76-11.el7_6, tomcat-el-2.2-api 7.0.76-11.el7_6, +3 morefixed: vendor fix RHSA-2021:0882
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Red Hat Enterprise Linux Server Optional EUS (v. 7.7) tomcat 7.0.76-12.el7_7, tomcat-lib 7.0.76-12.el7_7, tomcat-jsvc 7.0.76-12.el7_7, tomcat-javadoc 7.0.76-12.el7_7, tomcat-webapps 7.0.76-12.el7_7, tomcat-el-2.2-api 7.0.76-12.el7_7, +3 morefixed: vendor fix RHSA-2021:1030
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Red Hat Enterprise Linux Workstation (v. 7) tomcat 7.0.76-16.el7_9, tomcat-lib 7.0.76-16.el7_9, tomcat-webapps 7.0.76-16.el7_9, tomcat-el-2.2-api 7.0.76-16.el7_9, tomcat-jsp-2.2-api 7.0.76-16.el7_9, tomcat-admin-webapps 7.0.76-16.el7_9, +1 more Red Hat Enterprise Linux Workstation Optional (v. 7) tomcat-jsvc 7.0.76-16.el7_9, tomcat-javadoc 7.0.76-16.el7_9, tomcat-docs-webapp 7.0.76-16.el7_9fixed: vendor fix RHSA-2020:5020
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Red Hat Fuse 7.9fixed: vendor fix RHSA-2021:3140
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Red Hat JBoss Web Server (JWS) 5.3fixed: vendor fix RHSA-2020:1521
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Red Hat JBoss Web Server 3.1fixed: vendor fix RHSA-2020:3305
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Red Hat JBoss Web Server 3.1 for RHEL 6 tomcat7 7.0.70-41.ep7.el6, tomcat8 8.0.36-45.ep7.el6, tomcat7-lib 7.0.70-41.ep7.el6, tomcat8-lib 8.0.36-45.ep7.el6, tomcat7-jsvc 7.0.70-41.ep7.el6, tomcat8-jsvc 8.0.36-45.ep7.el6, +18 more Red Hat JBoss Web Server 3.1 for RHEL 7 tomcat7 7.0.70-41.ep7.el7, tomcat8 8.0.36-45.ep7.el7, tomcat7-lib 7.0.70-41.ep7.el7, tomcat8-lib 8.0.36-45.ep7.el7, tomcat7-jsvc 7.0.70-41.ep7.el7, tomcat8-jsvc 8.0.36-45.ep7.el7, +18 morefixed: vendor fix RHSA-2020:3303
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Red Hat JBoss Web Server 5.3 for RHEL 6 Server jws5-tomcat 9.0.30-3.redhat_4.1.el6jws, jws5-tomcat-lib 9.0.30-3.redhat_4.1.el6jws, jws5-tomcat-native 1.2.23-4.redhat_4.el6jws, jws5-tomcat-javadoc 9.0.30-3.redhat_4.1.el6jws, jws5-tomcat-selinux 9.0.30-3.redhat_4.1.el6jws, jws5-tomcat-webapps 9.0.30-3.redhat_4.1.el6jws, +5 more Red Hat JBoss Web Server 5.3 for RHEL 7 Server jws5-tomcat 9.0.30-3.redhat_4.1.el7jws, jws5-tomcat-lib 9.0.30-3.redhat_4.1.el7jws, jws5-tomcat-native 1.2.23-4.redhat_4.el7jws, jws5-tomcat-javadoc 9.0.30-3.redhat_4.1.el7jws, jws5-tomcat-selinux 9.0.30-3.redhat_4.1.el7jws, jws5-tomcat-webapps 9.0.30-3.redhat_4.1.el7jws, +5 more Red Hat JBoss Web Server 5.3 for RHEL 8 jws5-tomcat 9.0.30-3.redhat_4.1.el8jws, jws5-tomcat-lib 9.0.30-3.redhat_4.1.el8jws, jws5-tomcat-native 1.2.23-4.redhat_4.el8jws, jws5-tomcat-javadoc 9.0.30-3.redhat_4.1.el8jws, jws5-tomcat-selinux 9.0.30-3.redhat_4.1.el8jws, jws5-tomcat-webapps 9.0.30-3.redhat_4.1.el8jws, +5 morefixed: vendor fix RHSA-2020:1520
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Red Hat Runtimes Spring Boot 2.1.13fixed: vendor fix RHSA-2020:2367
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Red Hat Decision Manager 7 tomcat Red Hat Process Automation 7 tomcatnot 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
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
9.39% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |
| NVD | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
| OSV | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.apache.tomcat.embed:tomcat-embed-core | <7.0.100 >=8.0.0, <8.5.51 >=9.0.0, <9.0.31 |
7.0.100 8.5.51 9.0.31 |
| maven | org.apache.tomcat:tomcat | <7.0.100 >=8.0.0, <8.5.51 >=9.0.0, <9.0.31 |
7.0.100 8.5.51 9.0.31 |
| bitnami | tomcat | >=7.0.0, <7.0.100 >=8.5.0, <8.5.51 >=9.0.0, <9.0.31 |
7.0.100 8.5.51 9.0.31 |
Affected products
- Apache Apache Tomcat
Classification
- Weakness
-
- CWE-444 Inconsistent Interpretation of HTTP Requests
References
-
lists.opensuse.org
/opensuse-security-announce/2020-03/msg00025.html
vendor-advisory, web, broken-link, mailing-list, third-party-advisory, advisory
-
debian.org
/security/2020/dsa-4673
vendor-advisory, web, third-party-advisory, advisory
-
debian.org
/security/2020/dsa-4680
vendor-advisory, web, third-party-advisory, advisory
-
usn.ubuntu.com
/4448-1/
vendor-advisory, third-party-advisory, advisory
-
lists.apache.org
/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E
mailing-list, web, vendor-advisory, advisory
-
lists.debian.org
/debian-lts-announce/2020/03/msg00006.html
mailing-list, web, third-party-advisory, advisory
-
lists.apache.org
/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E
mailing-list, web
-
lists.debian.org
/debian-lts-announce/2020/05/msg00026.html
mailing-list, web, third-party-advisory, advisory
-
oracle.com
/security-alerts/cpujul2020.html
web, third-party-advisory, advisory
-
security.netapp.com
/advisory/ntap-20200327-0005/
third-party-advisory, advisory
-
lists.apache.org
/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E
mailing-list, web
-
oracle.com
/security-alerts/cpuoct2020.html
web, third-party-advisory, advisory
-
oracle.com
/security-alerts/cpujan2021.html
web, third-party-advisory, advisory
-
lists.apache.org
/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E
mailing-list, web
-
nvd.nist.gov
/vuln/detail/CVE-2020-1935
advisory, web
-
usn.ubuntu.com
/4448-1
web
-
security.netapp.com
/advisory/ntap-20200327-0005
web
-
lists.apache.org
/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18@%3Cusers.tomcat.apache.org%3E
web
-
lists.apache.org
/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743@%3Ccommits.tomee.apache.org%3E
web
-
lists.apache.org
/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7@%3Cusers.tomcat.apache.org%3E
web
-
lists.apache.org
/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6@%3Cdev.tomcat.apache.org%3E
web
-
lists.apache.org
/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1@%3Cusers.tomcat.apache.org%3E
web
-
lists.apache.org
/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78@%3Ccommits.tomee.apache.org%3E
web
-
lists.apache.org
/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919@%3Cusers.tomcat.apache.org%3E
web
-
lists.apache.org
/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75@%3Cusers.tomcat.apache.org%3E
web
Sources
- CVE List CVE-2020-1935
- GitHub Advisory GHSA-qxf4-chvg-4r8r
- NVD CVE-2020-1935
- OSV BIT-tomcat-2020-1935
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.