CVE-2020-10933

MEDIUM
5.3
CVSS Score
Published: May 4, 2020 at 02:54 PM UTC
Updated: June 17, 2026 at 02:48 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraRuby· also runs on 1 platform

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Severity
MEDIUM5.3
Exploit prediction
EPSS 3%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

95%
2.5.0 ≤ v ≤ 2.5.72.6.0 ≤ v ≤ 2.6.52.7.0
linux-linux-kernel (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-908

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