{"cve":"CVE-2019-16779","nvd":{"published":"2019-12-16T20:15:15.540","modified":"2026-07-28T18:16:09.650","status":"Analyzed","description":"In RubyGem excon before 0.71.0, there was a race condition around persistent connections, where a connection which is interrupted (such as by a timeout) would leave data on the socket. Subsequent requests would then read this data, returning content from the previous response. The race condition window appears to be short, and it would be difficult to purposefully exploit this.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-362","CWE-664"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00021.html","http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00062.html","https://github.com/excon/excon/commit/ccb57d7a422f020dc74f1de4e8fb505ab46d8a29","https://github.com/excon/excon/security/advisories/GHSA-q58g-455p-8vw9","https://lists.debian.org/debian-lts-announce/2020/01/msg00015.html"],"products":["debian:debian_linux","excon_project:excon","opensuse:backports_sle","opensuse:leap"],"source":"nvd","synced_at":"2026-10-19T20:59:27.069234358+00:00"},"epss":{"cve":"CVE-2019-16779","score":0.01662,"percentile":0.76695,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-q58g-455p-8vw9","url":"https://osv.dev/vulnerability/GHSA-q58g-455p-8vw9","summary":"In RubyGem excon, interrupted Persistent Connections May Leak Response Data","modified":"2026-09-10T03:49:25.169523118Z","packages":[{"ecosystem":"RubyGems","name":"excon","purl":"pkg:gem/excon","ranges":["<0.71.0"],"fixed":["0.71.0"]}]}],"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."]}