CVE-2018-1000101: Mingw-w64 version 5.0.3 and earlier, 5.0.4, 6.0.0 and 7.0.0 contains an Improper Null Termination (CWE-170) vu

Q: How do I fix CVE-2018-1000101?

mingw-w64: upgrade to newer than 5.0.3. Exact commands for each OS are on this page.

Q: Is CVE-2018-1000101 being exploited?

CVE-2018-1000101 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-2018-1000101 affect?

CVE-2018-1000101 affects mingw-w64. Severity is critical (CVSS 9.8). Mingw-w64 version 5.0.3 and earlier, 5.0.4, 6.0.0 and 7.0.0 contains an Improper Null Termination (CWE-170) vulnerability in mingw-w64-crt (libc)->(v)snprintf that can result in The bug may be used to corrupt subsequent string functions. Th

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CRITICAL 9.8REMOTEUPGRADE

CVE-2018-1000101 is a critical-severity flaw (CVSS 9.8) affecting mingw-w64. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Mingw-w64 version 5.0.3 and earlier, 5.0.4, 6.0.0 and 7.0.0 contains an Improper Null Termination (CWE-170) vulnerability in mingw-w64-crt (libc)->(v)snprintf that can result in The bug may be used to corrupt subsequent string functions. This attack appear to be exploitable via Depending on the usage, worst case: network.

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	2.2% (top 17%)
CISA exploited list	No
Published	2018-03-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mingw-w64

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

Am I affected?

Timeline

2018-03-06 17:29 UTCPublished CVE record published
2026-06-17 01:32 UTCUpdated Record last modified

mingw-w64 mingw-w64 UPGRADE

Affected: <= 5.0.3

Fixed in: newer than 5.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mingw-w64 || rpm -q mingw-w64 || mingw-w64 --version

2. UPGRADE to newer than 5.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mingw-w64

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mingw-w64

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-2018-1000101?

mingw-w64: upgrade to newer than 5.0.3. Exact commands for each OS are on this page.

Is CVE-2018-1000101 being exploited?

CVE-2018-1000101 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-2018-1000101 affect?

CVE-2018-1000101 affects mingw-w64. Severity is critical (CVSS 9.8). Mingw-w64 version 5.0.3 and earlier, 5.0.4, 6.0.0 and 7.0.0 contains an Improper Null Termination (CWE-170) vulnerability in mingw-w64-crt (libc)->(v)snprintf that can result in The bug may be used to corrupt subsequent string functions. Th

How urgent is CVE-2018-1000101?

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

Related CVEs

CVE-2018-5392 HIGH 7.5 DOWNGRADE mingw-w64 version 5.0.4 by default produces executables that opt in to ASLR, but are not compatible with ASLR

References

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