{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-48779: ws: Memory exhaustion DoS from tiny fragments and data chunks","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-48779","status":"final","version":"1","initial_release_date":"2026-06-16T21:26:22.537Z","current_release_date":"2026-06-16T21:26:22.537Z","revision_history":[{"date":"2026-06-16T21:26:22.537Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"ws is an open source WebSocket client and server for Node.js. All versions from 1.1.0 up to (but not including) 5.2.5, from 6.0.0 up to 6.2.4, from 7.0.0 up to 7.5.11, and from 8.0.0 up to 8.21.0 are affected by a memory exhaustion DoS vulnerability. A peer can send a high volume of exceptionally small fragments and data chunks, with modest network traffic, to force the remote peer into allocating and holding structural wrappers that consume far more memory than the default documented message-size limit, leading to process termination due to OOM. This issue has been fixed in versions 5.2.5, 6.2.4, 7.5.11, and 8.21.0.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-48779 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-48779"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-48779"},{"category":"external","summary":"https://github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p","url":"https://github.com/websockets/ws/security/advisories/GHSA-96hv-2xvq-fx4p"},{"category":"external","summary":"https://github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7","url":"https://github.com/websockets/ws/commit/86d3e8a5fb0246ed373860c5fbb0de88824a27f7"},{"category":"external","summary":"https://github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53","url":"https://github.com/websockets/ws/commit/b5372ac67bb97a773727b8e9f5035a8123556d53"},{"category":"external","summary":"https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94","url":"https://github.com/websockets/ws/commit/bca91adf15677e47dbe4f959653452727be28b94"},{"category":"external","summary":"https://github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8","url":"https://github.com/websockets/ws/commit/fd36cd864fcdf62a08273a99e19a7d975401fee8"}]},"product_tree":{"branches":[{"category":"vendor","name":"websockets","branches":[{"category":"product_name","name":"ws","branches":[{"category":"product_version","name":">= 1.1.0, < 5.2.5","product":{"name":"websockets ws >= 1.1.0, < 5.2.5","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:websockets:ws:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 6.0.0, < 6.2.4","product":{"name":"websockets ws >= 6.0.0, < 6.2.4","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:websockets:ws:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 7.0.0, < 7.5.11","product":{"name":"websockets ws >= 7.0.0, < 7.5.11","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:websockets:ws:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 8.0.0, < 8.21.0","product":{"name":"websockets ws >= 8.0.0, < 8.21.0","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:websockets:ws:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-48779","title":"ws: Memory exhaustion DoS from tiny fragments and data chunks","notes":[{"category":"description","text":"ws is an open source WebSocket client and server for Node.js. All versions from 1.1.0 up to (but not including) 5.2.5, from 6.0.0 up to 6.2.4, from 7.0.0 up to 7.5.11, and from 8.0.0 up to 8.21.0 are affected by a memory exhaustion DoS vulnerability. A peer can send a high volume of exceptionally small fragments and data chunks, with modest network traffic, to force the remote peer into allocating and holding structural wrappers that consume far more memory than the default documented message-size limit, leading to process termination due to OOM. This issue has been fixed in versions 5.2.5, 6.2.4, 7.5.11, and 8.21.0.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]}]}]}