CVE-2019-12408: It was discovered that the C++ implementation (which underlies the R, Python and Ruby implementations) of Apac

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HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2019-12408 is a high-severity flaw (CVSS 7.5) affecting arrow. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

It was discovered that the C++ implementation (which underlies the R, Python and Ruby implementations) of Apache Arrow 0.14.0 to 0.14.1 had a uninitialized memory bug when building arrays with null values in some cases. This can lead to uninitialized memory being unintentionally shared if Arrow Arrays are transmitted over the wire (for instance with Flight) or persisted in the streaming IPC and file formats.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.3% (top 12%)
CISA exploited list	No
Weakness	CWE-909
Published	2019-11-08
Last modified	2026-06-17

Publisher (CNA): Apache Software Foundation · Vendor: apache

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

Am I affected?

Timeline

2019-11-08 19:15 UTCPublished CVE record published
2026-06-17 02:14 UTCUpdated Record last modified

apache arrow UPGRADE

Affected: >= 0.14.0 and <= 0.14.1

Fixed in: newer than 0.14.1

Safe to downgrade to: a release before 0.14.0

1. Check installed version

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

2. UPGRADE to newer than 0.14.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade arrow

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 0.14.0 (Debian / Ubuntu)

apt-cache madison arrow sudo apt install arrow=<VERSION_BEFORE_0.14.0> sudo apt-mark hold arrow

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

dnf --showduplicates list arrow sudo dnf downgrade arrow-<VERSION_BEFORE_0.14.0> sudo dnf versionlock add arrow

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-2019-12408?

arrow: upgrade to newer than 0.14.1. Exact commands for each OS are on this page.

Is CVE-2019-12408 being exploited?

CVE-2019-12408 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-2019-12408 affect?

CVE-2019-12408 affects arrow. Severity is high (CVSS 7.5). It was discovered that the C++ implementation (which underlies the R, Python and Ruby implementations) of Apache Arrow 0.14.0 to 0.14.1 had a uninitialized memory bug when building arrays with null values in some cases. This can lead to uni

How urgent is CVE-2019-12408?

Priority 58/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Python vulnerabilities · Ruby vulnerabilities

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References

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