{"cve":"CVE-2023-26464","nvd":{"published":"2023-03-10T14:15:10.453","modified":"2026-06-17T05:43:23.487","status":"Modified","description":"** UNSUPPORTED WHEN ASSIGNED **\n\nWhen using the Chainsaw or SocketAppender components with Log4j 1.x on JRE less than 1.7, an attacker that manages to cause a logging entry involving a specially-crafted (ie, deeply nested) \nhashmap or hashtable (depending on which logging component is in use) to be processed could exhaust the available memory in the virtual machine and achieve Denial of Service when the object is deserialized.\n\nThis issue affects Apache Log4j before 2. Affected users are recommended to update to Log4j 2.x.\n\nNOTE: This vulnerability only affects products that are no longer supported by the maintainer.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-502"],"references":["https://lists.apache.org/thread/wkx6grrcjkh86crr49p4blc1v1nflj3t","https://security.netapp.com/advisory/ntap-20230505-0008/","https://lists.apache.org/thread/wkx6grrcjkh86crr49p4blc1v1nflj3t","https://security.netapp.com/advisory/ntap-20230505-0008/"],"products":["apache:log4j"],"source":"nvd","synced_at":"2026-10-19T21:37:41.955480748+00:00"},"epss":{"cve":"CVE-2023-26464","score":0.01905,"percentile":0.79719,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-vp98-w2p3-mv35","url":"https://osv.dev/vulnerability/GHSA-vp98-w2p3-mv35","summary":"Apache Log4j 1.x (EOL) allows Denial of Service (DoS)","modified":"2025-09-02T22:25:25Z","packages":[{"ecosystem":"Maven","name":"org.apache.logging.log4j:log4j-core","purl":"pkg:maven/org.apache.logging.log4j/log4j-core","ranges":[">=1.0.4 <2.0"],"fixed":["2.0"]},{"ecosystem":"Maven","name":"log4j:log4j","purl":"pkg:maven/log4j/log4j","ranges":[">=1.0.4 <2.0"],"fixed":["2.0"]}]}],"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."]}