CVE-2026-59943Public exploitNetwork attack vectorHinoki check available

File-existence disclosure via embedded SVG image references

Published Jul 28, 2026 · Updated Jul 28, 2026

Information disclosure in dompdf before 3.1.6 allows remote attackers to confirm backend file and directory existence through crafted SVG images. The SVG renderer resolves file URI values from href or xlink:href attributes inside a data-URI image and produces observably different PDF output when a target path exists. Exploitation requires an application to render attacker-controlled unrestricted HTML, and the oracle reveals path existence rather than file contents.

CVSS severity6.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Information disclosure in dompdf before 3.1.6 allows remote attackers to confirm backend file and directory existence through crafted SVG images. The SVG renderer resolves file URI values from href or xlink:href attributes inside a data-URI image and produces observably different PDF output when a target path exists. Exploitation requires an application to render attacker-controlled unrestricted HTML, and the oracle reveals path existence rather than file contents.

The record

CVE
CVE-2026-59943
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
dompdf
Product
dompdf
Classifications
CWE-209, T1083
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

dompdf · dompdfversion=< 3.1.6

Published CVSS scores

6.3GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-209Generation of Error Message Containing Sensitive Information
T1083File and Directory Discovery

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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