CVE-2019-19507: In jpv (aka Json Pattern Validator) before 2.1.1, compareCommon() can be bypassed because certain internal att

Q: How do I fix CVE-2019-19507?

json pattern validator: upgrade to 2.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2019-19507 being exploited?

CVE-2019-19507 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-19507 affect?

CVE-2019-19507 affects json pattern validator. Severity is medium (CVSS 5.3). In jpv (aka Json Pattern Validator) before 2.1.1, compareCommon() can be bypassed because certain internal attributes can be overwritten via a conflicting name, as demonstrated by 'constructor': {'name':'Array'}. This affects validate(). He

Q: How urgent is CVE-2019-19507?

Priority 44/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2019-19507 is a medium-severity flaw (CVSS 5.3) affecting json pattern validator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In jpv (aka Json Pattern Validator) before 2.1.1, compareCommon() can be bypassed because certain internal attributes can be overwritten via a conflicting name, as demonstrated by 'constructor': {'name':'Array'}. This affects validate(). Hence, a crafted payload can overwrite this builtin attribute to manipulate the type detection result.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-287
Published	2019-12-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: json pattern validator project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-12-02 17:15 UTCPublished CVE record published
2026-06-17 02:26 UTCUpdated Record last modified

json pattern validator project json pattern validator UPGRADE

Affected: < 2.1.1

Fixed in: 2.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy json-pattern-validator || rpm -q json-pattern-validator || json-pattern-validator --version

2. UPGRADE to 2.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade json-pattern-validator

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade json-pattern-validator

Note

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

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-2019-19507?

json pattern validator: upgrade to 2.1.1. Exact commands for each OS are on this page.

Is CVE-2019-19507 being exploited?

CVE-2019-19507 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-2019-19507 affect?

CVE-2019-19507 affects json pattern validator. Severity is medium (CVSS 5.3). In jpv (aka Json Pattern Validator) before 2.1.1, compareCommon() can be bypassed because certain internal attributes can be overwritten via a conflicting name, as demonstrated by 'constructor': {'name':'Array'}. This affects validate(). He

How urgent is CVE-2019-19507?

Priority 44/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-17479 CRITICAL 9.8 UPGRADE jpv (aka Json Pattern Validator) before 2.2.2 does not properly validate input, as demonstrated by a corrupted

References

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