{"cve":"CVE-2021-39194","nvd":{"published":"2021-09-07T20:15:08.193","modified":"2026-06-17T04:03:17.230","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-835"],"references":["https://github.com/charleskorn/kaml/commit/e18785d043fc6324c81e968aae9764b4b060bc6a","https://github.com/charleskorn/kaml/issues/179","https://github.com/charleskorn/kaml/security/advisories/GHSA-fmm9-3gv8-58f4","https://github.com/charleskorn/kaml/commit/e18785d043fc6324c81e968aae9764b4b060bc6a","https://github.com/charleskorn/kaml/issues/179"],"products":["kaml_project:kaml"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-39194","score":0.01658,"percentile":0.76636,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-fmm9-3gv8-58f4","url":"https://osv.dev/vulnerability/GHSA-fmm9-3gv8-58f4","summary":"Improper Handling of Missing Values in kaml","modified":"2026-07-08T06:28:53.326181749Z","packages":[{"ecosystem":"Maven","name":"com.charleskorn.kaml:kaml","purl":"pkg:maven/com.charleskorn.kaml/kaml","ranges":["<0.35.3"],"fixed":["0.35.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}