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Vulnerabilities

Vulnerability · CVE-2025-58369

fs2 is a compositional, streaming I/O library for Scala.

Published Sep 5, 2025 · catalog updated Nov 7, 2025 · fs2 is a compositional,

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-58369. EPSS is 0.45%. Act only if a listed version of fs2 is a compositional, is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (fs2 is a compositional,).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.45%
Remediation
Version ranges on file
Affected products
vendor typelevel fs2 3.13.0-M1, < 3.13.0-M7

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 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 serve

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor typelevel fs2 3.13.0-M1, < 3.13.0-M73.13.0-M1, < 3.13.0-M7

How to fix CVE-2025-58369

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-58369. EPSS is 0.45%. Act only if a listed version of fs2 is a compositional, is installed.

Which versions are affected?

Compare what you have installed with typelevel fs2 3.13.0-M1, < 3.13.0-M7 3.13.0-M1, < 3.13.0-M7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.45%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 5, 2025 · EUVD

    Detected

    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 while the peer side is awaiting more data to progress

  2. Nov 7, 2025 · EUVD

    Updated

    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 while the peer side is awaiting more data to progress

Sources

  • CVE.orgVulnerability recordCVE-2025-58369

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-58369

    30-day exploitation probability 0.45%

    first.org
  • EUVDVulnerability recordEUVD-2025-27048

    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 es

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026