Denial of Service Vulnerability in fs2 Streaming I/O Library for Scala
CVE-2025-58369

5.3MEDIUM

Key Information:

Vendor

Typelevel

Status
Fs2
Vendor
CVE Published:
5 September 2025

What is CVE-2025-58369?

The fs2 library, utilized for compositional and streaming I/O in Scala applications, is susceptible to a denial of service attack during TLS session establishment. When one side of the connection terminates its write operations prematurely while the peer waits for further data to complete the TLS handshake, the peer may enter a spin loop on socket read operations. This continuous CPU usage can lead to severe performance degradation, potentially incapacitating servers reliant on the fs2-io framework. The issue has been resolved in fs2 versions 3.12.1 and 3.13.0-M7.

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Affected Version(s)

fs2 >= 3.0.0-M1, < 3.12.2 < 3.0.0-M1, 3.12.2

fs2 >= 3.13.0-M1, < 3.13.0-M7 < 3.13.0-M1, 3.13.0-M7

fs2 < 2.5.13 < 2.5.13

References

https://github.com/typelevel/fs2/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/typelevel/fs2/issues/3590
x_refsource_MISC
https://github.com/typelevel/fs2/commit/46e2dc3abf994dcf3...
x_refsource_MISC

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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