{"id":"CVE-2026-93750","aliases":["AZL-103451","AZL-103487","DEBIAN-CVE-2026-93750","EUVD-2026-83255","GHSA-f27v-pv5m-c5g6","UBUNTU-CVE-2026-93750"],"status":"published","title":"http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard","description":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00445,"percentile":0.38985,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-436"],"published":"2026-09-18T17:51:35Z","modified":"2026-11-05T05:36:30Z","affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"nodejs-nodemon","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.0.3-5"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"python-tensorboard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.16.2-6"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"node-got","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.8.5+~cs58.13.36-3","11.8.5+~cs58.13.36-4","11.8.5+~cs58.13.36-5","11.8.5+~cs58.13.36-6","11.8.5+~cs58.13.36-7","11.8.5+~cs58.13.36-8","11.8.6+~cs58.13.36-1"]},{"source":"osv","ecosystem":"Debian:13","package":"node-got","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.8.5+~cs58.13.36-5","11.8.5+~cs58.13.36-6","11.8.5+~cs58.13.36-7","11.8.5+~cs58.13.36-8","11.8.6+~cs58.13.36-1"]},{"source":"osv","ecosystem":"Debian:14","package":"node-got","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.8.5+~cs58.13.36-5","11.8.5+~cs58.13.36-6","11.8.5+~cs58.13.36-7","11.8.5+~cs58.13.36-8","11.8.6+~cs58.13.36-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"node-got","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.1.0-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"node-got","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.1.0-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"node-got","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.8.1+~cs53.13.17-3","11.8.2+~cs58.7.32-2","11.8.3+~cs58.7.37-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"node-got","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.8.5+~cs58.13.36-3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"node-got","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.8.5+~cs58.13.36-6","11.8.5+~cs58.13.36-7"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"node-got","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.8.5+~cs58.13.36-5","11.8.5+~cs58.13.36-6"]}],"products":[{"vendor":"kornelski","product":"http-cache-semantics"}],"references":[{"url":"https://github.com/kornelski/http-cache-semantics/issues/57","tags":["issue-tracking","exploit","report"]},{"url":"https://github.com/kornelski/http-cache-semantics","tags":["product","report"]},{"url":"https://github.com/kornelski/http-cache-semantics/blob/f01112e954b83cfa8765b633ba880e5e980aa54c/index.js#L483-L501","tags":["technical-description","report"]},{"url":"https://www.vulncheck.com/advisories/http-cache-semantics-through-4.2.0-cross-client-cache-disclosure-via-vary-wildcard","tags":["third-party-advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93750","tags":["web"]},{"url":"https://github.com/advisories/GHSA-f27v-pv5m-c5g6"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-93750","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-93750","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93750","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-93750","title":"http-cache-semantics through 4.2.0 Cross-Client Cache Disclosure via Vary Wildcard","description":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","status":"published","published":"2026-09-18T17:51:35.687Z","modified":"2026-09-24T14:23:09.209Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:19:54.50686Z"}],"euvd":[{"id":"EUVD-2026-83255","description":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","status":"published","published":"2026-09-18T17:51:35Z","modified":"2026-09-24T14:23:09Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:27:57.035497Z"}],"ghsa":[{"id":"GHSA-f27v-pv5m-c5g6","title":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches(...","description":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","status":"published","published":"2026-09-18T18:31:44Z","modified":"2026-09-18T18:32:00Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T15:12:11.358904Z"}],"nvd":[{"id":"CVE-2026-93750","description":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","status":"published","published":"2026-09-18T18:18:33.633Z","modified":"2026-09-23T17:17:49.997Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:12:50.043898Z"}],"osv":[{"id":"DEBIAN-CVE-2026-93750","description":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","status":"published","published":"2026-09-18T18:18:33.633Z","modified":"2026-09-24T09:00:16.133133877Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:46:06.846102Z"},{"id":"UBUNTU-CVE-2026-93750","description":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","status":"published","published":"2026-09-18T18:18:00Z","modified":"2026-10-17T13:01:18.504108082Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"},{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:57:44.071534Z"},{"id":"AZL-103451","title":"CVE-2026-93750 affecting package nodejs-nodemon 2.0.3-5","description":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","status":"published","published":"2026-09-18T18:18:33Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:17.528763Z"},{"id":"AZL-103487","title":"CVE-2026-93750 affecting package python-tensorboard 2.16.2-6","description":"http-cache-semantics through 4.2.0 contains a cache validation vulnerability in the _varyMatches() function that fails to properly validate Vary header wildcards due to byte-for-byte string comparison. Attackers can request URLs previously fetched by other clients to receive cached responses intended for different users, disclosing sensitive information across clients.","status":"published","published":"2026-09-18T18:18:33Z","modified":"2026-09-28T05:39:54Z","updated_at":"2026-11-02T15:28:00.794214Z"}]}}