CVE-2026-79515Public exploitNetwork attack vector

Service interruption via malformed glyph contour

Published Sep 9, 2026 · Updated Sep 9, 2026

Out-of-bounds read in stb commit 31c1ad3 allows attackers to interrupt font-processing applications via a crafted TTF file. stbtt__GetGlyphShapeTT indexes vertices[off+i+1] when a glyph contour ends with one off-curve point, reading one byte beyond the allocated vertex array. A user must cause an affected application to process the file; published evidence demonstrates availability loss, not data disclosure or code execution.

CVSS severity4.3
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in stb commit 31c1ad3 allows attackers to interrupt font-processing applications via a crafted TTF file. stbtt__GetGlyphShapeTT indexes vertices[off+i+1] when a glyph contour ends with one off-curve point, reading one byte beyond the allocated vertex array. A user must cause an affected application to process the file; published evidence demonstrates availability loss, not data disclosure or code execution.

The record

CVE
CVE-2026-79515
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3MITRECVSS:3.1/AC:L/AV:N/A:L/C:N/I:N/PR:N/S:U/UI:R

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1204.002Malicious File

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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