CVE-2017-9146: The TNEFFillMapi function in lib/ytnef.c in libytnef in ytnef through 1.9.2 does not ensure a nonzero count va

Q: How do I fix CVE-2017-9146?

ytnef: upgrade to newer than 1.9.2. Exact commands for each OS are on this page.

Q: Is CVE-2017-9146 being exploited?

CVE-2017-9146 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-2017-9146 affect?

CVE-2017-9146 affects ytnef. Severity is high (CVSS 8.8). The TNEFFillMapi function in lib/ytnef.c in libytnef in ytnef through 1.9.2 does not ensure a nonzero count value before a certain memory allocation, which allows remote attackers to cause a denial of service (heap-based buffer overflow and

Q: How urgent is CVE-2017-9146?

Priority 57/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2017-9146 is a high-severity flaw (CVSS 8.8) affecting ytnef. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The TNEFFillMapi function in lib/ytnef.c in libytnef in ytnef through 1.9.2 does not ensure a nonzero count value before a certain memory allocation, which allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted tnef file.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-119
Published	2017-05-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ytnef project

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

Am I affected?

Timeline

2017-05-22 18:29 UTCPublished CVE record published
2026-06-17 01:27 UTCUpdated Record last modified

ytnef project ytnef UPGRADE

Affected: <= 1.9.2

Fixed in: newer than 1.9.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.9.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ytnef

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-2017-9146?

ytnef: upgrade to newer than 1.9.2. Exact commands for each OS are on this page.

Is CVE-2017-9146 being exploited?

CVE-2017-9146 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-2017-9146 affect?

CVE-2017-9146 affects ytnef. Severity is high (CVSS 8.8). The TNEFFillMapi function in lib/ytnef.c in libytnef in ytnef through 1.9.2 does not ensure a nonzero count value before a certain memory allocation, which allows remote attackers to cause a denial of service (heap-based buffer overflow and

How urgent is CVE-2017-9146?

Priority 57/100. High severity; Public exploit reference

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References

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