CVE-2018-1000052: fmtlib version prior to version 4.1.0 (before commit 0555cea5fc0bf890afe0071a558e44625a34ba85) contains a Memo

Q: How do I fix CVE-2018-1000052?

fmt: upgrade to 4.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2018-1000052 being exploited?

CVE-2018-1000052 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-1000052 affect?

CVE-2018-1000052 affects fmt. Severity is high (CVSS 7.5). fmtlib version prior to version 4.1.0 (before commit 0555cea5fc0bf890afe0071a558e44625a34ba85) contains a Memory corruption (SIGSEGV), CWE-134 vulnerability in fmt::print() library function that can result in Denial of Service. This attack

Q: How urgent is CVE-2018-1000052?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2018-1000052 is a high-severity flaw (CVSS 7.5) affecting fmt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

fmtlib version prior to version 4.1.0 (before commit 0555cea5fc0bf890afe0071a558e44625a34ba85) contains a Memory corruption (SIGSEGV), CWE-134 vulnerability in fmt::print() library function that can result in Denial of Service. This attack appear to be exploitable via Specifying an invalid format specifier in the fmt::print() function results in a SIGSEGV (memory corruption, invalid write). This vulnerability appears to have been fixed in after c

Why this priority

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

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	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-134
Published	2018-02-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fmt

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

Am I affected?

Timeline

2018-02-09 23:29 UTCPublished CVE record published
2026-06-17 01:32 UTCUpdated Record last modified

fmt fmt UPGRADE

Affected: < 4.1.0

Fixed in: 4.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 4.1.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fmt

Note

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

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-2018-1000052?

fmt: upgrade to 4.1.0. Exact commands for each OS are on this page.

Is CVE-2018-1000052 being exploited?

CVE-2018-1000052 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-2018-1000052 affect?

CVE-2018-1000052 affects fmt. Severity is high (CVSS 7.5). fmtlib version prior to version 4.1.0 (before commit 0555cea5fc0bf890afe0071a558e44625a34ba85) contains a Memory corruption (SIGSEGV), CWE-134 vulnerability in fmt::print() library function that can result in Denial of Service. This attack

How urgent is CVE-2018-1000052?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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