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

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CRITICAL 9.8REMOTEUPGRADE

CVE-2020-17479 is a critical-severity flaw (CVSS 9.8) affecting json pattern validator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

jpv (aka Json Pattern Validator) before 2.2.2 does not properly validate input, as demonstrated by a corrupted array.

Why this priority

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

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	2.5% (top 16%)
CISA exploited list	No
Weakness	CWE-20
Published	2020-08-10
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

2020-08-10 20:15 UTCPublished CVE record published
2026-06-17 02:58 UTCUpdated Record last modified

json pattern validator project json pattern validator UPGRADE

Affected: < 2.2.2

Fixed in: 2.2.2

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls json-pattern-validator

2. UPGRADE to 2.2.2

npm install json-pattern-validator@">=2.2.2"

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-2020-17479?

json pattern validator: upgrade to 2.2.2. Exact commands for each OS are on this page.

Is CVE-2020-17479 being exploited?

CVE-2020-17479 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-2020-17479 affect?

CVE-2020-17479 affects json pattern validator. Severity is critical (CVSS 9.8). jpv (aka Json Pattern Validator) before 2.2.2 does not properly validate input, as demonstrated by a corrupted array.

How urgent is CVE-2020-17479?

Priority 65/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-19507 MEDIUM 5.3 UPGRADE In jpv (aka Json Pattern Validator) before 2.1.1, compareCommon() can be bypassed because certain internal att

References

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