CVE-2020-8441: JYaml through 1.3 allows remote code execution during deserialization of a malicious payload through the load(

Q: How do I fix CVE-2020-8441?

jyaml: upgrade to newer than 1.3. Exact commands for each OS are on this page.

Q: Is CVE-2020-8441 being exploited?

CVE-2020-8441 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-2020-8441 affect?

CVE-2020-8441 affects jyaml. Severity is critical (CVSS 9.8). JYaml through 1.3 allows remote code execution during deserialization of a malicious payload through the load() function. NOTE: this is a discontinued product.

Q: How urgent is CVE-2020-8441?

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

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2020-8441 is a critical-severity flaw (CVSS 9.8) affecting jyaml. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

JYaml through 1.3 allows remote code execution during deserialization of a malicious payload through the load() function. NOTE: this is a discontinued product.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
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	5.0% (top 8%)
CISA exploited list	No
Weakness	CWE-502
Published	2020-02-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jyaml project

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

Am I affected?

Timeline

2020-02-19 17:15 UTCPublished CVE record published
2026-06-17 03:26 UTCUpdated Record last modified

jyaml project jyaml UPGRADE

Affected: <= 1.3

Fixed in: newer than 1.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jyaml || rpm -q jyaml || jyaml --version

2. UPGRADE to newer than 1.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jyaml

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jyaml

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-2020-8441?

jyaml: upgrade to newer than 1.3. Exact commands for each OS are on this page.

Is CVE-2020-8441 being exploited?

CVE-2020-8441 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-2020-8441 affect?

CVE-2020-8441 affects jyaml. Severity is critical (CVSS 9.8). JYaml through 1.3 allows remote code execution during deserialization of a malicious payload through the load() function. NOTE: this is a discontinued product.

How urgent is CVE-2020-8441?

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

References

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