CVE-2022-33068Public exploit

Application interruption via oversized sbix glyph dimensions

Published Jun 22, 2022 · Updated Aug 3, 2024

Integer overflow in HarfBuzz 4.3.0 allows context-dependent attackers to interrupt a consuming application with a crafted sbix font. The sbix glyph-extents parser accepts PNG IHDR dimensions of at least 65,536, allowing later signed positioning arithmetic in fallback shaping to overflow. A target must process attacker-controlled bitmap-font data; the demonstrated consequence is undefined arithmetic and service interruption, not data access or code execution.

CVSS severity5.5
Medium
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in HarfBuzz 4.3.0 allows context-dependent attackers to interrupt a consuming application with a crafted sbix font. The sbix glyph-extents parser accepts PNG IHDR dimensions of at least 65,536, allowing later signed positioning arithmetic in fallback shaping to overflow. A target must process attacker-controlled bitmap-font data; the demonstrated consequence is undefined arithmetic and service interruption, not data access or code execution.

The record

CVE
CVE-2022-33068
Published
Jun 22, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-190
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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