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CVE-2021-39194

21
FAUCET Score

CVE-2021-39194 is a denial-of-service vulnerability affecting the kaml library, an open-source YAML implementation for Kotlin. Attackers providing specially crafted YAML input to applications using kaml with default tagged polymorphic serialization could trigger an infinite loop, leading to resource exhaustion and application unavailability. This medium-severity vulnerability (CVSS 6.5) requires low privileges and network access, with a high impact on availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.35.3CPE matchmatch criteria
cpe:2.3:a:kaml_project:kaml:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.66%
Probability of exploitation in next 30 days
EPSS Percentile
74.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0166 is in the 87th percentile among its peer group of 21,974 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: com.charleskorn.kaml:kamlFixed in: 0.35.3

Vendor Advisories (1)

mavenGHSA-fmm9-3gv8-58f4medium

Improper Handling of Missing Values in kaml

Sep 7, 2021

References

github.com / charleskorn/kaml/commit/e18785d043fc6324c81e968aae9764b4b060bc6a
PatchThird Party Advisory
github.com / charleskorn/kaml/issues/179
ExploitPatchThird Party Advisory
github.com / charleskorn/kaml/security/advisories/GHSA-fmm9-3gv8-58f4
ExploitThird Party Advisory