CVE-2021-23470: This affects the package putil-merge before 3.8.0

Q: How do I fix CVE-2021-23470?

putil-merge: upgrade to 3.8.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-23470 being exploited?

CVE-2021-23470 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-2021-23470 affect?

CVE-2021-23470 affects putil-merge. Severity is high (CVSS 8.2). This affects the package putil-merge before 3.8.0. The merge() function does not check the values passed into the argument. An attacker can supply a malicious value by adjusting the value to include the constructor property. Note: This vuln

Q: How urgent is CVE-2021-23470?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.2REMOTEUPGRADE

CVE-2021-23470 is a high-severity flaw (CVSS 8.2) affecting putil-merge. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This affects the package putil-merge before 3.8.0. The merge() function does not check the values passed into the argument. An attacker can supply a malicious value by adjusting the value to include the constructor property. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-PUTILMERGE-1317077

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-1321
Published	2022-02-04
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: putil-merge project

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

Am I affected?

Timeline

2022-02-04 20:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

putil-merge project putil-merge UPGRADE

Affected: < 3.8.0

Fixed in: 3.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy putil-merge || rpm -q putil-merge || putil-merge --version

2. UPGRADE to 3.8.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade putil-merge

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade putil-merge

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-2021-23470?

putil-merge: upgrade to 3.8.0. Exact commands for each OS are on this page.

Is CVE-2021-23470 being exploited?

CVE-2021-23470 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-2021-23470 affect?

CVE-2021-23470 affects putil-merge. Severity is high (CVSS 8.2). This affects the package putil-merge before 3.8.0. The merge() function does not check the values passed into the argument. An attacker can supply a malicious value by adjusting the value to include the constructor property. Note: This vuln

How urgent is CVE-2021-23470?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-25953 CRITICAL 9.8 UPGRADE Prototype pollution vulnerability in 'putil-merge' versions1.0.0 through 3.6.6 allows attacker to cause a deni

References

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