CVE-2021-32823: In the bindata RubyGem before version 2.4.10 there is a potential denial-of-service vulnerability

This week

LOW 3.7REMOTEUPGRADEUPGRADE

CVE-2021-32823 is a low-severity flaw (CVSS 3.7) affecting bindata, gitlab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-400
Published	2021-06-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: bindata project · gitlab

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-06-24 00:15 UTCPublished CVE record published
2026-06-17 03:53 UTCUpdated Record last modified

bindata project bindata UPGRADE

Affected: < 2.4.10

Fixed in: 2.4.10

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bindata || rpm -q bindata || bindata --version

2. UPGRADE to 2.4.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bindata

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bindata

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

gitlab gitlab UPGRADE

Affected: >= 12.0 and < 13.10.5 · >= 13.11.0 and < 13.11.5 · >= 13.12.0 and < 13.12.2

Fixed in: 13.10.5, 13.11.5, 13.12.2

Safe to downgrade to: a release before 12.0

1. Check installed version

apt-cache policy gitlab || rpm -q gitlab || gitlab --version

2. UPGRADE to 13.10.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gitlab

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gitlab

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 12.0 (Debian / Ubuntu)

apt-cache madison gitlab sudo apt install gitlab=<VERSION_BEFORE_12.0> sudo apt-mark hold gitlab

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gitlab sudo dnf downgrade gitlab-<VERSION_BEFORE_12.0> sudo dnf versionlock add gitlab

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-32823?

bindata: upgrade to 2.4.10; gitlab: upgrade to 13.10.5, 13.11.5, 13.12.2. Exact commands for each OS are on this page.

Is CVE-2021-32823 being exploited?

CVE-2021-32823 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-32823 affect?

CVE-2021-32823 affects bindata, gitlab. Severity is low (CVSS 3.7). 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, BinDat

How urgent is CVE-2021-32823?

Priority 43/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

GitLab vulnerabilities

References

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