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CVE-2025-58369— fs2: Half-shutdown of socket during TLS handshake may result in spin loop on opposite side

Quick assessment

Affected
typelevel fs2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FS2是typelevel.scala开源的一个Scala的组合式流式I/O库。 FS2 3.12.2及之前版本和3.13.0-M1至3.13.0-M6版本存在资源管理错误漏洞，该漏洞源于TLS会话处理不当，可能导致拒绝服务攻击。

CVSS 5.3 · Medium EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-58369

Vulnerability Information
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Vulnerability Title
fs2: Half-shutdown of socket during TLS handshake may result in spin loop on opposite side
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
FS2 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FS2是typelevel.scala开源的一个Scala的组合式流式I/O库。 FS2 3.12.2及之前版本和3.13.0-M1至3.13.0-M6版本存在资源管理错误漏洞，该漏洞源于TLS会话处理不当，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
typelevel fs2 >= 3.0.0-M1, < 3.12.2 -

II. Public POCs for CVE-2025-58369

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III. Intelligence Information for CVE-2025-58369

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Vendor Advisories for CVE-2025-58369 (1)

IV. Related Vulnerabilities

Same product: fs2
Same vendor: typelevel
Same weakness: CWE-400

V. Comments for CVE-2025-58369

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