CVE-2020-10933

An issue was discovered in Ruby 2.5.x through 2.5.7, 2.6.x through 2.6.5, and 2.7.0. If a victim calls BasicSocket#read_nonblock(requested_size, buffer, exception: false), the method resizes the buffer to fit the requested size, but no data is copied. Thus, the buffer string provides the previous value of the heap. This may expose possibly sensitive data from the interpreter.

• CWE-908

• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F4TNVTT66VPRMX5UZYSDGSVRXKKDDDU5/
• https://security.netapp.com/advisory/ntap-20200625-0001/Third Party Advisory
• https://www.debian.org/security/2020/dsa-4721Third Party Advisory
• https://www.ruby-lang.org/en/news/2020/03/31/heap-exposure-in-socket-cve-2020-10933/Exploit, Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F4TNVTT66VPRMX5UZYSDGSVRXKKDDDU5/
• https://security.netapp.com/advisory/ntap-20200625-0001/Third Party Advisory
• https://www.debian.org/security/2020/dsa-4721Third Party Advisory
• https://www.ruby-lang.org/en/news/2020/03/31/heap-exposure-in-socket-cve-2020-10933/Exploit, Vendor Advisory

Published

May 4, 2020

Last Modified

Jun 17, 2026

Status

Modified

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