CVE-2023-28118: kaml provides YAML support for kotlinx.serialization

Q: How do I fix CVE-2023-28118?

kaml: upgrade to 0.53.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-28118 being exploited?

CVE-2023-28118 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-2023-28118 affect?

CVE-2023-28118 affects kaml. Severity is high (CVSS 7.5). kaml provides YAML support for kotlinx.serialization. Prior to version 0.53.0, applications that use kaml to parse untrusted input containing anchors and aliases may consume excessive memory and crash. Version 0.53.0 and later default to re

Q: How urgent is CVE-2023-28118?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2023-28118 is a high-severity flaw (CVSS 7.5) affecting kaml. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

kaml provides YAML support for kotlinx.serialization. Prior to version 0.53.0, applications that use kaml to parse untrusted input containing anchors and aliases may consume excessive memory and crash. Version 0.53.0 and later default to refusing to parse YAML documents containing anchors and aliases. There are no known workarounds.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
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-776
Published	2023-03-20
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2023-03-20 13:15 UTCPublished CVE record published
2026-06-17 05:46 UTCUpdated Record last modified

kaml project kaml UPGRADE

Affected: < 0.53.0

Fixed in: 0.53.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.53.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kaml

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-2023-28118?

kaml: upgrade to 0.53.0. Exact commands for each OS are on this page.

Is CVE-2023-28118 being exploited?

CVE-2023-28118 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-2023-28118 affect?

CVE-2023-28118 affects kaml. Severity is high (CVSS 7.5). kaml provides YAML support for kotlinx.serialization. Prior to version 0.53.0, applications that use kaml to parse untrusted input containing anchors and aliases may consume excessive memory and crash. Version 0.53.0 and later default to re

How urgent is CVE-2023-28118?

Priority 47/100. High severity; Remotely exploitable, no login, no user action

References

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