What’s Vulnerable › Vulnerabilities

CVE-2021-32823: Potential Denial-of-Service in bindata

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-24 · updated 2026-06-17
• Weakness: CWE-400

Description

In the bindata RubyGem before version 2.4.10 there is a potential denial-of-service vulnerability. In affected versions it is very slow for certain classes in BinData to be created. For example BinData::Bit100000, BinData::Bit100001, BinData::Bit100002, BinData::Bit<N>. In combination with <user_input>.constantize there is a potential for a CPU-based DoS. In version 2.4.10 bindata improved the creation time of Bits and Integers.

Affected products

• Bindata Project Bindata: before 2.4.10 — fixed in 2.4.10
• GitLab: from 12.0 before 13.10.5; from 13.11.0 before 13.11.5; from 13.12.0 before 13.12.2 — fixed in 13.10.5, 13.11.5, 13.12.2

How to fix

Upgrade to a fixed version: Bindata Project Bindata 2.4.10; GitLab 13.10.5, 13.11.5, 13.12.2. Check the vendor advisory for mitigations.

References

• https://about.gitlab.com/releases/2021/06/01/security-release-gitlab-13-12-2-released/#update-bindata-dependency
• https://github.com/dmendel/bindata/blob/v2.4.10/ChangeLog.rdoc#version-2410-2021-05-18-
• https://github.com/dmendel/bindata/commit/d99f050b88337559be2cb35906c1f8da49531323
• https://github.com/rubysec/ruby-advisory-db/issues/476
• https://rubygems.org/gems/bindata
• https://about.gitlab.com/releases/2021/06/01/security-release-gitlab-13-12-2-released/#update-bindata-dependency
• https://github.com/dmendel/bindata/blob/v2.4.10/ChangeLog.rdoc#version-2410-2021-05-18-
• https://github.com/dmendel/bindata/commit/d99f050b88337559be2cb35906c1f8da49531323
• https://github.com/rubysec/ruby-advisory-db/issues/476
• https://rubygems.org/gems/bindata

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