CVE-2018-7999: In libgraphite2 in graphite2 1.3.11, a NULL pointer dereference vulnerability was found in Segment.cpp during

This month

HIGH 8.8DOWNGRADE

CVE-2018-7999 is a high-severity flaw (CVSS 8.8) affecting graphite2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In libgraphite2 in graphite2 1.3.11, a NULL pointer dereference vulnerability was found in Segment.cpp during a dumbRendering operation, which may allow attackers to cause a denial of service or possibly have unspecified other impact via a crafted .ttf file.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-476
Published	2018-03-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sil

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

Am I affected?

Timeline

2018-03-09 19:29 UTCPublished CVE record published
2026-06-17 02:04 UTCUpdated Record last modified

sil graphite2 DOWNGRADE

Affected: 1.3.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.11

1. Check installed version

apt-cache policy graphite2 || rpm -q graphite2 || graphite2 --version

2. No fixed release: DOWNGRADE to a release before 1.3.11 (Debian / Ubuntu)

apt-cache madison graphite2 sudo apt install graphite2=<VERSION_BEFORE_1.3.11> sudo apt-mark hold graphite2

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list graphite2 sudo dnf downgrade graphite2-<VERSION_BEFORE_1.3.11> sudo dnf versionlock add graphite2

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-2018-7999?

graphite2: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-7999 being exploited?

CVE-2018-7999 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-2018-7999 affect?

CVE-2018-7999 affects graphite2. Severity is high (CVSS 8.8). In libgraphite2 in graphite2 1.3.11, a NULL pointer dereference vulnerability was found in Segment.cpp during a dumbRendering operation, which may allow attackers to cause a denial of service or possibly have unspecified other impact via a

How urgent is CVE-2018-7999?

Priority 57/100. High severity; Public exploit reference

Related CVEs

CVE-2017-7778 CRITICAL 9.8 UPGRADE UPGRADE A number of security vulnerabilities in the Graphite 2 library including out-of-bounds reads, buffer overflow
CVE-2017-7777 HIGH 8.8 UPGRADE UPGRADE Use of uninitialized memory in Graphite2 library in Firefox before 54 in graphite2::GlyphCache::Loader::read_g
CVE-2017-7776 HIGH 8.1 UPGRADE UPGRADE Heap-based Buffer Overflow read in Graphite2 library in Firefox before 54 in graphite2::Silf::getClassGlyph.
CVE-2017-7774 CRITICAL 9.1 UPGRADE UPGRADE Out-of-bounds read in Graphite2 Library in Firefox before 54 in graphite2::Silf::readGraphite function.
CVE-2017-7773 HIGH 8.8 UPGRADE UPGRADE Heap-based Buffer Overflow write in Graphite2 library in Firefox before 54 in lz4::decompress src/Decompressor

References

← Back to latest CVEs