fs2 is a compositional, streaming I/O library for Scala. Versions 3.12.2 and lower and 3.13.0-M1 through 3.13.0-M6 is 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 3.12.1 and 3.13.0-M7.
Metrics
Affected Vendors & Products
References
History
Mon, 08 Sep 2025 20:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Sun, 07 Sep 2025 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Typelevel
Typelevel fs2 |
|
| Vendors & Products |
Typelevel
Typelevel fs2 |
Fri, 05 Sep 2025 22:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | fs2 is a compositional, streaming I/O library for Scala. Versions 3.12.2 and lower and 3.13.0-M1 through 3.13.0-M6 is 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 3.12.1 and 3.13.0-M7. | |
| Title | fs2: Half-shutdown of socket during TLS handshake may result in spin loop on opposite side | |
| Weaknesses | CWE-400 | |
| References |
|
|
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: GitHub_M
Published: 2025-09-05T21:59:58.981Z
Updated: 2025-09-08T20:09:32.825Z
Reserved: 2025-08-29T16:19:59.012Z
Link: CVE-2025-58369
Updated: 2025-09-08T20:09:29.795Z
Status : Awaiting Analysis
Published: 2025-09-05T22:15:34.883
Modified: 2025-09-08T16:25:38.810
Link: CVE-2025-58369
No data.