CVE-2016-4852: YoruFukurou (NightOwl) before 2.85 relies on support for emoji skin-tone modifiers even though this support is

Q: How do I fix CVE-2016-4852?

yorufukurou: upgrade to newer than 2.84. Exact commands for each OS are on this page.

Q: Is CVE-2016-4852 being exploited?

CVE-2016-4852 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-2016-4852 affect?

CVE-2016-4852 affects yorufukurou. Severity is medium (CVSS 6.5). YoruFukurou (NightOwl) before 2.85 relies on support for emoji skin-tone modifiers even though this support is missing from the CoreText CTFramesetter API on OS X 10.9, which allows remote attackers to cause a denial of service (application

Q: How urgent is CVE-2016-4852?

Priority 42/100. No elevated risk signals yet.

This month

MEDIUM 6.5UPGRADE

CVE-2016-4852 is a medium-severity flaw (CVSS 6.5) affecting yorufukurou. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

YoruFukurou (NightOwl) before 2.85 relies on support for emoji skin-tone modifiers even though this support is missing from the CoreText CTFramesetter API on OS X 10.9, which allows remote attackers to cause a denial of service (application crash) via a crafted emoji character sequence.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.7% (top 22%)
CISA exploited list	No
Weakness	CWE-20
Published	2016-09-12
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: aki-null

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

Am I affected?

Timeline

2016-09-12 10:59 UTCPublished CVE record published
2026-06-17 00:48 UTCUpdated Record last modified

aki-null yorufukurou UPGRADE

Affected: <= 2.84

Fixed in: newer than 2.84

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.84 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade yorufukurou

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-2016-4852?

yorufukurou: upgrade to newer than 2.84. Exact commands for each OS are on this page.

Is CVE-2016-4852 being exploited?

CVE-2016-4852 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-2016-4852 affect?

CVE-2016-4852 affects yorufukurou. Severity is medium (CVSS 6.5). YoruFukurou (NightOwl) before 2.85 relies on support for emoji skin-tone modifiers even though this support is missing from the CoreText CTFramesetter API on OS X 10.9, which allows remote attackers to cause a denial of service (application

How urgent is CVE-2016-4852?

Priority 42/100. No elevated risk signals yet.

References

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