CVE-2025-50951Public exploitNetwork attack vector

Application denial of service via unreleased UTF-7 buffer

Published Oct 23, 2025 · Updated Oct 23, 2025

Memory leak in FontForge 20230101 and earlier allows attackers to interrupt the application via a crafted SFD file opened by a user. The utf7toutf8_copy path in fontforge/sfd.c allocates utf16buf while decoding UTF-7 data but fails to free it after copying into ucs2_str. Exploitation requires user interaction; repeated parsing exhausts process memory and denies service without disclosing or modifying data.

CVSS severity6.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in FontForge 20230101 and earlier allows attackers to interrupt the application via a crafted SFD file opened by a user. The utf7toutf8_copy path in fontforge/sfd.c allocates utf16buf while decoding UTF-7 data but fails to free it after copying into ucs2_str. Exploitation requires user interaction; repeated parsing exhausts process memory and denies service without disclosing or modifying data.

The record

CVE
CVE-2025-50951
Published
Oct 23, 2025
Updated
Oct 23, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 2025Record 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

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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

CWE-401Missing Release of Memory after Effective Lifetime
T1204.002User Execution: Malicious 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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