{"id":"CVE-2025-58369","state":"PUBLISHED","title":"fs2: Half-shutdown of socket during TLS handshake may result in spin loop on opposite side","description":"fs2 is a compositional, streaming I/O library for Scala. Versions up to and including 2.5.12, 3.0.0-M1 through 3.12.2, and 3.13.0-M1 through 3.13.0-M6 are vulnerable to denial of service attacks though TLS sessions using fs2-io on the JVM using the fs2.io.net.tls package. When establishing a TLS session, if one side of the connection shuts down `write` while the peer side is awaiting more data to progress the TLS handshake, the peer side will spin loop on the socket read, fully utilizing a CPU. The CPU is consumed until the overall connection is closed, potentially shutting down a fs2-io powered server. This issue is fixed in versions  2.5.13, 3.12.1, and 3.13.0-M7.","publishedAt":"2025-09-05T21:59:58.981Z","updatedAt":"2025-11-07T11:52:43.148Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["typelevel fs2"],"affected":[{"vendor":"typelevel","product":"fs2","versions":[{"version":">= 3.0.0-M1, < 3.12.2","status":"affected"},{"version":">= 3.13.0-M1, < 3.13.0-M7","status":"affected"},{"version":"< 2.5.13","status":"affected"}]}],"references":["https://github.com/typelevel/fs2/security/advisories/GHSA-rrw2-px9j-qffj","https://github.com/typelevel/fs2/issues/3590","https://github.com/typelevel/fs2/commit/46e2dc3abf994dcf3d0b804b2ddb3c10c04d4976","https://github.com/typelevel/fs2/commit/5c6c4c6c1ef330f7e6b53661ecc63d5f5ba8885c","https://github.com/typelevel/fs2/commit/edf0c4f2e660360d1c1a8c5377ce32294de89238","https://github.com/typelevel/fs2/releases/tag/v3.12.2","https://github.com/typelevel/fs2/releases/tag/v3.13.0-M7"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T20:09:39.787Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/58xxx/CVE-2025-58369.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-58369","state":"PUBLISHED","datePublished":"2025-09-05T21:59:58.981Z","dateUpdated":"2025-11-07T11:52:43.148Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2025-08-29T16:19:59.012Z"},"containers":{"cna":{"title":"fs2: Half-shutdown of socket during TLS handshake may result in spin loop on opposite side","descriptions":[{"lang":"en","value":"fs2 is a compositional, streaming I/O library for Scala. Versions up to and including 2.5.12, 3.0.0-M1 through 3.12.2, and 3.13.0-M1 through 3.13.0-M6 are vulnerable to denial of service attacks though TLS sessions using fs2-io on the JVM using the fs2.io.net.tls package. When establishing a TLS session, if one side of the connection shuts down `write` while the peer side is awaiting more data to progress the TLS handshake, the peer side will spin loop on the socket read, fully utilizing a CPU. The CPU is consumed until the overall connection is closed, potentially shutting down a fs2-io powered server. This issue is fixed in versions  2.5.13, 3.12.1, and 3.13.0-M7."}],"affected":[{"vendor":"typelevel","product":"fs2","versions":[{"version":">= 3.0.0-M1, < 3.12.2","status":"affected"},{"version":">= 3.13.0-M1, < 3.13.0-M7","status":"affected"},{"version":"< 2.5.13","status":"affected"}]}],"references":[{"url":"https://github.com/typelevel/fs2/security/advisories/GHSA-rrw2-px9j-qffj","name":"https://github.com/typelevel/fs2/security/advisories/GHSA-rrw2-px9j-qffj","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/typelevel/fs2/issues/3590","name":"https://github.com/typelevel/fs2/issues/3590","tags":["x_refsource_MISC"]},{"url":"https://github.com/typelevel/fs2/commit/46e2dc3abf994dcf3d0b804b2ddb3c10c04d4976","name":"https://github.com/typelevel/fs2/commit/46e2dc3abf994dcf3d0b804b2ddb3c10c04d4976","tags":["x_refsource_MISC"]},{"url":"https://github.com/typelevel/fs2/commit/5c6c4c6c1ef330f7e6b53661ecc63d5f5ba8885c","name":"https://github.com/typelevel/fs2/commit/5c6c4c6c1ef330f7e6b53661ecc63d5f5ba8885c","tags":["x_refsource_MISC"]},{"url":"https://github.com/typelevel/fs2/commit/edf0c4f2e660360d1c1a8c5377ce32294de89238","name":"https://github.com/typelevel/fs2/commit/edf0c4f2e660360d1c1a8c5377ce32294de89238","tags":["x_refsource_MISC"]},{"url":"https://github.com/typelevel/fs2/releases/tag/v3.12.2","name":"https://github.com/typelevel/fs2/releases/tag/v3.12.2","tags":["x_refsource_MISC"]},{"url":"https://github.com/typelevel/fs2/releases/tag/v3.13.0-M7","name":"https://github.com/typelevel/fs2/releases/tag/v3.13.0-M7","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2025-11-07T11:52:43.148Z"},"source":{"advisory":"GHSA-rrw2-px9j-qffj","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-09-08T20:09:25.588603Z","id":"CVE-2025-58369","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-09-08T20:09:32.825Z"}}]}}}