CVE-2021-39131: ced detects character encoding using Google’s compact_enc_det library

Q: How do I fix CVE-2021-39131?

ced: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-39131 being exploited?

CVE-2021-39131 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-2021-39131 affect?

CVE-2021-39131 affects ced. Severity is high (CVSS 7.5). ced detects character encoding using Google’s compact_enc_det library. In ced v0.1.0, passing data types other than `Buffer` causes the Node.js process to crash. The problem has been patched in ced v1.0.0. As a workaround, before passing an

Q: How urgent is CVE-2021-39131?

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

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2021-39131 is a high-severity flaw (CVSS 7.5) affecting ced. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ced detects character encoding using Google’s compact_enc_det library. In ced v0.1.0, passing data types other than `Buffer` causes the Node.js process to crash. The problem has been patched in ced v1.0.0. As a workaround, before passing an argument to ced, verify it’s a `Buffer` using `Buffer.isBuffer(obj)`.

Why this priority

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

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 20%)
CISA exploited list	No
Weakness	CWE-241, CWE-755
Published	2021-08-17
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: ced project

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

Am I affected?

Timeline

2021-08-17 23:15 UTCPublished CVE record published
2026-06-17 04:03 UTCUpdated Record last modified

ced project ced DOWNGRADE

Affected: 0.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.1.0

1. Check installed version

npm ls ced

2. No fixed release: DOWNGRADE to a release before 0.1.0

npm view ced versions npm install ced@"<0.1.0"

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-2021-39131?

ced: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-39131 being exploited?

CVE-2021-39131 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-2021-39131 affect?

CVE-2021-39131 affects ced. Severity is high (CVSS 7.5). ced detects character encoding using Google’s compact_enc_det library. In ced v0.1.0, passing data types other than `Buffer` causes the Node.js process to crash. The problem has been patched in ced v1.0.0. As a workaround, before passing an

How urgent is CVE-2021-39131?

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

Software pages

Node.js vulnerabilities

References

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