CVE-2024-56732: HarfBuzz is a text shaping engine

This month

HIGH 8.8UPGRADE

CVE-2024-56732 is a high-severity flaw (CVSS 8.8) affecting harfbuzz. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HarfBuzz is a text shaping engine. Starting with 8.5.0 through 10.0.1, there is a heap-based buffer overflow in the hb_cairo_glyphs_from_buffer function.

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	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-122
Published	2024-12-27
Last modified	2026-06-25

Publisher (CNA): GitHub, Inc. · Vendor: harfbuzz project

Last updated 2026-06-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-12-27 20:15 UTCPublished CVE record published
2026-06-25 15:32 UTCUpdated Record last modified

harfbuzz project harfbuzz UPGRADE

Affected: >= 8.5.0 and <= 10.0.1

Fixed in: newer than 10.0.1

Safe to downgrade to: a release before 8.5.0

1. Check installed version

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

2. UPGRADE to newer than 10.0.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade harfbuzz

Note

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

3. If no update is available yet, DOWNGRADE to a release before 8.5.0 (Debian / Ubuntu)

apt-cache madison harfbuzz sudo apt install harfbuzz=<VERSION_BEFORE_8.5.0> sudo apt-mark hold harfbuzz

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list harfbuzz sudo dnf downgrade harfbuzz-<VERSION_BEFORE_8.5.0> sudo dnf versionlock add harfbuzz

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-2024-56732?

harfbuzz: upgrade to newer than 10.0.1. Exact commands for each OS are on this page.

Is CVE-2024-56732 being exploited?

CVE-2024-56732 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-2024-56732 affect?

CVE-2024-56732 affects harfbuzz. Severity is high (CVSS 8.8). HarfBuzz is a text shaping engine. Starting with 8.5.0 through 10.0.1, there is a heap-based buffer overflow in the hb_cairo_glyphs_from_buffer function.

How urgent is CVE-2024-56732?

Priority 49/100. High severity; Public exploit reference

References

← Back to latest CVEs