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CVE-2024-56732

25
FAUCET Score

CVE-2024-56732 describes a heap-based buffer overflow in the hb_cairo_glyphs_from_buffer function of the HarfBuzz text shaping engine, affecting versions 8.5.0 through 10.0.1. This vulnerability carries a high CVSS score of 8.8, indicating a critical risk due to its network attack vector, low attack complexity, and high potential for confidentiality, integrity, and availability impacts. While no active exploitation, public exploit code, or significant community discussion has been observed, the inherent severity warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
>= 8.5.0, <= 10.0.1CPE matchmatch criteria
cpe:2.3:a:harfbuzz_project:harfbuzz:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

9.3CRITICAL

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.66%
Probability of exploitation in next 30 days
EPSS Percentile
47.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0066 is in the 49th percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 17496-17084Fixed in: 8.3.0-3
microsoftpatch availablevia msrc
Product: 17497-17084Fixed in: 6.6.3-2
microsoftpatch availablevia msrc
Product: 19441-17084Fixed in: 6.6.3-2
microsoftpatch availablevia msrc
Product: azl3 harfbuzz 8.3.0-3 on Azure Linux 3.0Fixed in: 8.3.0-3
microsoftpatch availablevia msrc
Product: azl3 qtbase 6.6.3-2 on Azure Linux 3.0Fixed in: 6.6.3-2
microsoftpatch availablevia msrc
Product: azl3 qtbase 6.6.3-3 on Azure Linux 3.0Fixed in: 6.6.3-2

Vendor Advisories (1)

microsoft2024-Dec/CVE-2024-56732Important

HarfBuzz heap-buffer-overflow on hb_cairo_glyphs_from_buffer

Dec 10, 2024

References

github.com / harfbuzz/harfbuzz/commit/1767f99e2e2196c3fcae27db6d8b60098d3f6d26
Patch
github.com / harfbuzz/harfbuzz/security/advisories/GHSA-qmp9-xqm5-jh6m
ExploitVendor Advisory