{"schemaVersion":3,"id":"CVE-2026-84784","aliases":["ALPINE-CVE-2026-84784","UBUNTU-CVE-2026-84784","DEBIAN-CVE-2026-84784","CGA-3h28-hqr8-mjh4","CGA-7q7p-4g45-7rx8","CGA-fmfx-h7f8-p7wq","CGA-hgvf-799v-4v4j","CGA-hvr6-mj34-3mrh","CGA-m434-666p-ww2w","CGA-qg84-m6xq-r3hg","CGA-vfjc-m86c-p28g"],"status":"published","duplicateOf":null,"title":null,"description":"Issue summary: A malicious remote peer may flood the local QUIC\nstack with NEW_CONNECTION_ID frames by avoiding a limit check on\nhow many connection IDs the remote QUIC stack can use.\n\nImpact summary: The local QUIC stack sends a RETIRE_CONN_ID frame\nfor every NEW_CONNECTION_ID frame it receives. The RETIRE_CONN_ID\nframe is dispatched via the Control Frame Queue (CFQ). If the remote\npeer also withholds ACKs, then it can force the local stack\nto allocate ~400MB (depending on ACK delay).\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: RFC 9000 sections 5.1.1 and 5.1.2 [1] describe the mechanism\nby which a remote peer can notify the local QUIC stack to change the\ndestination connection ID (a.k.a. CID) the local stack uses to\nidentify the connection at the remote peer. Each CID is associated\nwith a sequence number. The sequence number is transmitted\nin NEW_CONNECTION_ID and RETIRE_CONNECTION_ID frames to identify the CID\nwhich is being either associated with a connection or retired.\n\nThe remote peer sends a NEW_CONNECTION_ID frame to let the local stack know\na new CID is being associated with an existing connection. The\nNEW_CONNECTION_ID frame carries the new CID, its sequence number, and the\nretire-prior-to number. The retire-prior-to identifies existing\nCIDs that are to be retired. The local QUIC stack must send a\nRETIRE_CONNECTION_ID for every destination CID whose sequence number\nis less than retire-prior-to. The CID becomes retired after the\nlocal stack receives an ACK for its RETIRE_CONNECTION_ID frame.\n\nAlthough the OpenSSL QUIC stack supports at most one destination CID\nfor every connection, it can be tricked into processing more than\none RETIRE_CONNECTION_ID frame per connection. The OpenSSL QUIC\nstack currently retires the destination CID as soon as it receives\nthe NEW_CONNECTION_ID, while in fact the destination CID must\nbe retired after an ACK for the RETIRE_CONNECTION_ID frame is received.\nCorrecting the flawed logic also fixes the backlog growth.\n\n[1] https://datatracker.ietf.org/doc/html/rfc9000#name-issuing-connection-ids\n\nFIPS impact: no\nThe FIPS module is not affected as the QUIC implementation is outside of\nthe OpenSSL FIPS module boundary.","dates":{"published":"2026-09-29T15:32:25.758Z","modified":"2026-09-29T16:44:09.766Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Alpine","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Chainguard","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00403,"percentile":0.33142,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-09-30T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00403,"percentile":0.33142}],"last30":[{"date":"2026-09-30T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00403,"percentile":0.33142}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling","description":"The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/770.html"}],"affected":[{"vendor":"alpine","product":"openssl","name":"openssl","label":"openssl","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/openssl","purlType":"apk","versions":[{"text":"≥ 3.4.0, < 3.3.7-r2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.4.0, < 3.3.7-r2","eol":null,"hubHref":null},{"vendor":"chainguard","product":"openssl-provider-fips-3.4.0","name":"openssl-provider-fips-3.4.0","label":"openssl-provider-fips-3.4.0","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/openssl-provider-fips-3.4.0","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"openssl-provider-fips-3.4.0-dbg","name":"openssl-provider-fips-3.4.0-dbg","label":"openssl-provider-fips-3.4.0-dbg","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/openssl-provider-fips-3.4.0-dbg","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"openssl-provider-fips-3.6.0","name":"openssl-provider-fips-3.6.0","label":"openssl-provider-fips-3.6.0","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/openssl-provider-fips-3.6.0","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"chainguard","product":"openssl-provider-fips-3.6.0-dbg","name":"openssl-provider-fips-3.6.0-dbg","label":"openssl-provider-fips-3.6.0-dbg","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/openssl-provider-fips-3.6.0-dbg","purlType":"apk","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"debian","product":"openssl","name":"openssl","label":"openssl","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/openssl","purlType":"deb","versions":[{"text":"< 3.5.7-1~deb13u3","noFixRecorded":false,"fixedIn":null},{"text":"< 3.6.5-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.5.7-1~deb13u3 | < 3.6.5-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"edk2","name":"edk2","label":"edk2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/edk2","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"edk2-hwe","name":"edk2-hwe","label":"edk2-hwe","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/edk2-hwe","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"nodejs","name":"nodejs","label":"nodejs","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/nodejs","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"openssl","name":"openssl","label":"openssl","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/openssl","purlType":"deb","versions":[{"text":"< 3.5.5-1ubuntu3.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.5.5-1ubuntu3.6","eol":null,"hubHref":null},{"vendor":"openssl","product":"openssl","name":"OpenSSL","label":"openssl","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.4.0, < 3.4.8","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.5.0, < 3.5.9","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.6.0, < 3.6.5","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.0.0, < 4.0.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.4.0, < 3.4.8 | ≥ 3.5.0, < 3.5.9 | ≥ 3.6.0, < 3.6.5 | ≥ 4.0.0, < 4.0.3","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"openssl","label":"OpenSSL","category":"framework"}},"hubHref":"/vendor/openssl/openssl"}],"affectedCount":11,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://openssl-library.org/news/secadv/20260929.txt","label":"openssl-library.org/news/secadv/20260929.txt","hostname":"openssl-library.org","tags":["Vendor Advisory","REPORT","Advisory"]},{"url":"https://github.com/openssl/openssl/commit/e9e5155833fa968bee50024bf9ca3a185ab599fe","label":"github.com/openssl/openssl/commit/e9e5155833fa968bee50024bf9ca3a185ab599fe","hostname":"github.com","tags":["Patch","FIX"]},{"url":"https://github.com/openssl/openssl/commit/4685c914b0d410b1034f40b547c95bc95e7a380a","label":"github.com/openssl/openssl/commit/4685c914b0d410b1034f40b547c95bc95e7a380a","hostname":"github.com","tags":["Patch","FIX"]},{"url":"https://github.com/openssl/openssl/commit/dba3c48d653c64fcbc9070a17a0ee2b3e2f3af1f","label":"github.com/openssl/openssl/commit/dba3c48d653c64fcbc9070a17a0ee2b3e2f3af1f","hostname":"github.com","tags":["Patch","FIX"]},{"url":"https://github.com/openssl/openssl/commit/9a30fe0fba195c14e5b87bf93c0d0fdb70373806","label":"github.com/openssl/openssl/commit/9a30fe0fba195c14e5b87bf93c0d0fdb70373806","hostname":"github.com","tags":["Patch","FIX"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-84784","label":"security.alpinelinux.org/vuln/CVE-2026-84784","hostname":"security.alpinelinux.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-84784","label":"ubuntu.com/security/CVE-2026-84784","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84784","label":"www.cve.org/CVERecord?id=CVE-2026-84784","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-8847-1","label":"ubuntu.com/security/notices/USN-8847-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-84784","label":"security-tracker.debian.org/tracker/CVE-2026-84784","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84784.json","label":"github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84784.json","hostname":"github.com","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84784","label":"nvd.nist.gov/vuln/detail/CVE-2026-84784","hostname":"nvd.nist.gov","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["MGASA-2026-0481","OPENSUSE-SU-2026:22102-1","RHSA-2026:74162","RHSA-2026:74166","SUSE-SU-2026:4414-1","USN-8847-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:22102-1","SUSE-SU-2026:4414-1","USN-8847-1"]},"timeline":[{"kind":"published","date":"2026-09-29T15:32:25.758Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-29T16:44:09.766Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T04:25:20.148Z","stale":false,"partial":false}}