{"id":"JLSEC-2026-1334","details":"curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as `CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending `NEW_ENV` variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.","modified":"2026-08-17T13:30:03.099571784Z","published":"2026-08-17T13:15:13.400Z","upstream":["CVE-2021-22898"],"database_specific":{"sources":[{"url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-22898","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22898","database_specific":{"status":"Modified"},"id":"CVE-2021-22898","imported":"2026-08-16T08:05:12.435Z","modified":"2026-06-17T03:37:58.730Z","published":"2021-06-11T16:15:11.043Z"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2021/07/21/4"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2021/07/21/4"},{"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://curl.se/docs/CVE-2021-22898.html"},{"type":"WEB","url":"https://curl.se/docs/CVE-2021-22898.html"},{"type":"WEB","url":"https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde"},{"type":"WEB","url":"https://github.com/curl/curl/commit/39ce47f219b09c380b81f89fe54ac586c8db6bde"},{"type":"WEB","url":"https://hackerone.com/reports/1176461"},{"type":"WEB","url":"https://hackerone.com/reports/1176461"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rc713534b10f9daeee2e0990239fa407e2118e4aa9e88a7041177497c%40%3Cissues.guacamole.apache.org%3E"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2021/08/msg00017.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2021/08/msg00017.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html"},{"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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POOC3UV7V6L4CJ5KA2PTWTNUV5Y72T3Q/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/POOC3UV7V6L4CJ5KA2PTWTNUV5Y72T3Q/"},{"type":"WEB","url":"https://www.debian.org/security/2022/dsa-5197"},{"type":"WEB","url":"https://www.debian.org/security/2022/dsa-5197"},{"type":"WEB","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"WEB","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2022.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-2026-1334.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V2","score":"AV:N/AC:H/Au:N/C:P/I:N/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N"}]}