CVE-2019-14697: musl libc through 1.1.23 has an x87 floating-point stack adjustment imbalance, related to the math/i386/ direc

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-14697 is a critical-severity flaw (CVSS 9.8) affecting musl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

musl libc through 1.1.23 has an x87 floating-point stack adjustment imbalance, related to the math/i386/ directory. In some cases, use of this library could introduce out-of-bounds writes that are not present in an application's source code.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-787
Published	2019-08-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: musl-libc

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

Am I affected?

Timeline

2019-08-06 16:15 UTCPublished CVE record published
2026-06-17 02:18 UTCUpdated Record last modified

musl-libc musl UPGRADE

Affected: >= 0.9.12 and <= 1.1.23

Fixed in: newer than 1.1.23

Safe to downgrade to: a release before 0.9.12

1. Check installed version

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

2. UPGRADE to newer than 1.1.23 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade musl

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 0.9.12 (Debian / Ubuntu)

apt-cache madison musl sudo apt install musl=<VERSION_BEFORE_0.9.12> sudo apt-mark hold musl

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

dnf --showduplicates list musl sudo dnf downgrade musl-<VERSION_BEFORE_0.9.12> sudo dnf versionlock add musl

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-2019-14697?

musl: upgrade to newer than 1.1.23. Exact commands for each OS are on this page.

Is CVE-2019-14697 being exploited?

CVE-2019-14697 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-2019-14697 affect?

CVE-2019-14697 affects musl. Severity is critical (CVSS 9.8). musl libc through 1.1.23 has an x87 floating-point stack adjustment imbalance, related to the math/i386/ directory. In some cases, use of this library could introduce out-of-bounds writes that are not present in an application's source code

How urgent is CVE-2019-14697?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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