{"id":"JLSEC-2026-1337","details":"curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.","modified":"2026-08-17T13:30:03.156588647Z","published":"2026-08-17T13:15:13.400Z","upstream":["CVE-2021-22925"],"database_specific":{"license":"CC-BY-4.0","sources":[{"id":"CVE-2021-22925","imported":"2026-08-16T08:05:12.517Z","modified":"2026-06-17T03:38:02.427Z","published":"2021-08-05T21:15:11.467Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-22925","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22925","database_specific":{"status":"Modified"}}]},"references":[{"type":"WEB","url":"http://seclists.org/fulldisclosure/2021/Sep/39"},{"type":"WEB","url":"http://seclists.org/fulldisclosure/2021/Sep/39"},{"type":"WEB","url":"http://seclists.org/fulldisclosure/2021/Sep/40"},{"type":"WEB","url":"http://seclists.org/fulldisclosure/2021/Sep/40"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf"},{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf"},{"type":"WEB","url":"https://hackerone.com/reports/1223882"},{"type":"WEB","url":"https://hackerone.com/reports/1223882"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/"},{"type":"WEB","url":"https://security.gentoo.org/glsa/202212-01"},{"type":"WEB","url":"https://security.gentoo.org/glsa/202212-01"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20210902-0003/"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20210902-0003/"},{"type":"WEB","url":"https://support.apple.com/kb/HT212804"},{"type":"WEB","url":"https://support.apple.com/kb/HT212804"},{"type":"WEB","url":"https://support.apple.com/kb/HT212805"},{"type":"WEB","url":"https://support.apple.com/kb/HT212805"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"}],"affected":[{"package":{"name":"LibCURL_jll","ecosystem":"Julia","purl":"pkg:julia/LibCURL_jll?uuid=deac9b47-8bc7-5906-a0fe-35ac56dc84c0"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.81.0+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1337.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V2","score":"AV:N/AC:L/Au:N/C:P/I:N/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}