{"schemaVersion":3,"id":"CVE-2026-63075","aliases":["ALPINE-CVE-2026-63075","UBUNTU-CVE-2026-63075","DEBIAN-CVE-2026-63075","CGA-4848-c5hg-v9m2","CGA-4939-6pqc-xmvc","CGA-7q35-4x7w-c74w","CGA-7r29-5qxq-grcf","CGA-8x83-8x4j-r96r","CGA-958x-74vh-f9fc","CGA-c882-cv2h-c726","CGA-cx76-gwx2-5wpm","CGA-gggw-vhcj-r8rg","CGA-mjgp-gf66-x4gp","CGA-p353-6xgv-v5f2","CGA-v32g-864g-52rg","CGA-wq93-r9m2-2qjg","CGA-wxwg-4954-qgcp"],"status":"published","duplicateOf":null,"title":null,"description":"Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly\nsends ack-eliciting packets while not acknowledging ACK-only responses, the\nQUIC stack can retain ACK-only packet metadata for the lifetime of the\nconnection.\n\nImpact summary: A remote peer that can complete a QUIC handshake can\ncause connection-scoped memory growth which may lead to Denial of Service\nthrough memory exhaustion, especially with sustained traffic or many concurrent\nQUIC connections.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: When the OpenSSL QUIC stack sends an ACK-only packet,\nthere is no requirement by the QUIC protocol that the peer will acknowledge\nthat ACK-only packet (i.e. it is itself not ack-eliciting). However, the OpenSSL\nimplementation stores the metadata about the ACK frames regardless.\nIn and of itself that's ok, but if a malicious peer establishes a connection, and\nthen drives the connection such that ACK-only packets are forced from the\nOpenSSL implementation peer (i.e., by sending numerous PING frames),\nand then withholding any subsequent acks for ack-eliciting data, like\nlegitimate data, said malicious peer can force inappropriate memory growth\non the OpenSSL peer, potentially leading to a Denial of Service.\n\nThe fix is to ensure that we account for the transmission of the ACK-only\npacket in the packet histories high and low watermark without actually storing\nthe ACK-only packet metadata itself.\n\nFIPS impact: no\nThe OpenSSL FIPS module is not affected as the QUIC code is\noutside the FIPS module boundary.","dates":{"published":"2026-08-25T13:00:04.752Z","modified":"2026-08-25T14:36:51.928Z","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 · 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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, < 3.5.8-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.4.0, < 3.5.8-r0","eol":null,"hubHref":null},{"vendor":"chainguard","product":"eco-python-openssl-4","name":"eco-python-openssl-4","label":"eco-python-openssl-4","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/eco-python-openssl-4","purlType":"apk","versions":[{"text":"< 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