Vulnerability in Charleskorn Kaml
CVE-2021-39194
kaml is an open source implementation of the YAML format with support for kotlinx.serialization. In affected versions attackers that could provide arbitrary YAML input to an application that uses kaml could cause the application to endlessly loop while parsing the input. This could result in resource starvation and denial of service. This only affects applications that use polymorphic serialization with the default tagged polymorphism style. Applications using the property polymorphism style are not affected. YAML input for a polymorphic type that provided a tag but no value for the object would trigger the issue. Version 0.35.3 or later contain the fix for this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.017 (75.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Charleskorn Kaml — versions < 0.35.2
- Kaml Project
Weakness classification (CWE)
References
- github.com/charleskorn/kaml/security/advisories/GHSA-fmm9-3gv8-58f4 (Exploit, Third Party Advisory)
- github.com/charleskorn/kaml/issues/179 (Exploit, Patch, Third Party Advisory)
- github.com/charleskorn/kaml/commit/e18785d043fc6324c81e968aae9764b4b060bc6a (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-39194?
- CVE-2021-39194 is a medium-severity vulnerability in Charleskorn Kaml, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 4.3/10. Published 2021-09-07.
- How severe is CVE-2021-39194?
- Medium severity. CVSS v3 base score is 4.3 out of 10.