CVE-2020-26683Public exploit

Sensitive-information exposure via retained font-width object

Published Aug 22, 2023 · Updated Oct 3, 2024

Memory leak in Artifex MuPDF 1.17.0 allows local users to obtain sensitive information when a crafted PDF document is opened. When curr_code reaches face->num_glyphs, pdf_add_cid_font_widths fails to publish and drop the current run_obj array, leaving its allocation retained. Exploitation requires local execution and user interaction; the published assessment reports confidentiality impact without integrity or availability impact.

CVSS severity5.5
Medium
EPSS probability0.31%
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 Artifex MuPDF 1.17.0 allows local users to obtain sensitive information when a crafted PDF document is opened. When curr_code reaches face->num_glyphs, pdf_add_cid_font_widths fails to publish and drop the current run_obj array, leaving its allocation retained. Exploitation requires local execution and user interaction; the published assessment reports confidentiality impact without integrity or availability impact.

The record

CVE
CVE-2020-26683
Published
Aug 22, 2023
Updated
Oct 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 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:H/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

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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