CVE-2019-16943: A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.0.0 through 2.9.10

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2019-16943 is a critical-severity flaw (CVSS 9.8) affecting jackson-databind, debian linux, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.0.0 through 2.9.10. When Default Typing is enabled (either globally or for a specific property) for an externally exposed JSON endpoint and the service has the p6spy (3.8.6) jar in the classpath, and an attacker can find an RMI service endpoint to access, it is possible to make the service execute a malicious payload. This issue exists because of com.p6spy.engine.spy.P6Data

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.7% (top 8%)
CISA exploited list	No
Weakness	CWE-502
Published	2019-10-01
Last modified	2026-10-07

Publisher (CNA): MITRE · Vendor: debian · fasterxml · fedoraproject · oracle · redhat

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-10-01 17:15 UTCPublished CVE record published
2026-10-07 21:17 UTCUpdated Record last modified

fasterxml jackson-databind UPGRADE

Affected: >= 2.0.0 and < 2.6.7.3 · >= 2.7.0 and < 2.8.11.5 · >= 2.9.0 and < 2.9.10.1

Fixed in: 2.6.7.3, 2.8.11.5, 2.9.10.1

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy jackson-databind || rpm -q jackson-databind || jackson-databind --version

2. UPGRADE to 2.6.7.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jackson-databind

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jackson-databind

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison jackson-databind sudo apt install jackson-databind=<VERSION_BEFORE_2.0.0> sudo apt-mark hold jackson-databind

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jackson-databind sudo dnf downgrade jackson-databind-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add jackson-databind

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

debian debian linux MITIGATE

Affected: 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

fedoraproject fedora MITIGATE

Affected: 30 · 31

Fixed in: no fixed release known

Safe to downgrade to: a release before 30

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

redhat jboss enterprise application platform DOWNGRADE

Affected: 7.2 · 7.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.2

1. Check installed version

apt-cache policy jboss-enterprise-application-platform || rpm -q jboss-enterprise-application-platform || jboss-enterprise-application-platform --version

2. No fixed release: DOWNGRADE to a release before 7.2 (Debian / Ubuntu)

apt-cache madison jboss-enterprise-application-platform sudo apt install jboss-enterprise-application-platform=<VERSION_BEFORE_7.2> sudo apt-mark hold jboss-enterprise-application-platform

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jboss-enterprise-application-platform sudo dnf downgrade jboss-enterprise-application-platform-<VERSION_BEFORE_7.2> sudo dnf versionlock add jboss-enterprise-application-platform

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

oracle banking platform DOWNGRADE

Affected: 2.4.0 · 2.4.1 · 2.5.0 · 2.6.0 · 2.6.1 · 2.6.2 · 2.7.0 · 2.7.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.4.0

1. Check installed version

apt-cache policy banking-platform || rpm -q banking-platform || banking-platform --version

2. No fixed release: DOWNGRADE to a release before 2.4.0 (Debian / Ubuntu)

apt-cache madison banking-platform sudo apt install banking-platform=<VERSION_BEFORE_2.4.0> sudo apt-mark hold banking-platform

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list banking-platform sudo dnf downgrade banking-platform-<VERSION_BEFORE_2.4.0> sudo dnf versionlock add banking-platform

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

oracle communications billing and revenue management DOWNGRADE

Affected: 7.5.0.23.0 · 12.0.0.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.5.0.23.0

1. Check installed version

apt-cache policy communications-billing-and-revenue-management || rpm -q communications-billing-and-revenue-management || communications-billing-and-revenue-management --version

2. No fixed release: DOWNGRADE to a release before 7.5.0.23.0 (Debian / Ubuntu)

apt-cache madison communications-billing-and-revenue-management sudo apt install communications-billing-and-revenue-management=<VERSION_BEFORE_7.5.0.23.0> sudo apt-mark hold communications-billing-and-revenue-management

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list communications-billing-and-revenue-management sudo dnf downgrade communications-billing-and-revenue-management-<VERSION_BEFORE_7.5.0.23.0> sudo dnf versionlock add communications-billing-and-revenue-management

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-16943?

jackson-databind: upgrade to 2.6.7.3, 2.8.11.5, 2.9.10.1; debian linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-16943 being exploited?

CVE-2019-16943 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-16943 affect?

CVE-2019-16943 affects jackson-databind, debian linux, fedora. Severity is critical (CVSS 9.8). A Polymorphic Typing issue was discovered in FasterXML jackson-databind 2.0.0 through 2.9.10. When Default Typing is enabled (either globally or for a specific property) for an externally exposed JSON endpoint and the service has the p6spy

How urgent is CVE-2019-16943?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities · JBoss and WildFly vulnerabilities

Related CVEs

CVE-2026-54512 HIGH 8.1 UPGRADE jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Proce
CVE-2026-54513 HIGH 8.1 UPGRADE jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Proce
CVE-2026-50193 HIGH 7.5 UPGRADE jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Proce
CVE-2026-54518 MEDIUM 6.5 UPGRADE jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Proce
CVE-2026-54515 MEDIUM 5.3 UPGRADE jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Proce

References

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