CVE-2019-15552: An issue was discovered in the libflate crate before 0.1.25 for Rust

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-15552 is a critical-severity flaw (CVSS 9.8) affecting libflate. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the libflate crate before 0.1.25 for Rust. MultiDecoder::read has a use-after-free, leading to arbitrary code execution.

Why this priority

Critical severity
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 16%)
CISA exploited list	No
Weakness	CWE-416
Published	2019-08-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: libflate project

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

Am I affected?

Timeline

2019-08-26 15:15 UTCPublished CVE record published
2026-06-17 02:20 UTCUpdated Record last modified

libflate project libflate UPGRADE

Affected: >= 0.1.14 and < 0.1.25

Fixed in: 0.1.25

Safe to downgrade to: a release before 0.1.14

1. Check installed version

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

2. UPGRADE to 0.1.25 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libflate

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 0.1.14 (Debian / Ubuntu)

apt-cache madison libflate sudo apt install libflate=<VERSION_BEFORE_0.1.14> sudo apt-mark hold libflate

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

dnf --showduplicates list libflate sudo dnf downgrade libflate-<VERSION_BEFORE_0.1.14> sudo dnf versionlock add libflate

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-2019-15552?

libflate: upgrade to 0.1.25. Exact commands for each OS are on this page.

Is CVE-2019-15552 being exploited?

CVE-2019-15552 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-2019-15552 affect?

CVE-2019-15552 affects libflate. Severity is critical (CVSS 9.8). An issue was discovered in the libflate crate before 0.1.25 for Rust. MultiDecoder::read has a use-after-free, leading to arbitrary code execution.

How urgent is CVE-2019-15552?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

References

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