CVE-2026-54604Network attack vector

Heap-data disclosure via partial TIFF tile sizing

Published Sep 17, 2026 · Updated Sep 17, 2026

Information disclosure in OpenSlide before 4.0.1 allows remote authenticated users to read heap data via crafted TIFF slides. The indirect TIFF tile path requests a full-height destination for a partial bottom tile row, causing openslide_read_region() to return uninitialized heap bytes as pixels. Exploitation requires libtiff 4.7.1 and a non-NDPI TIFF-based slide, while transparency handling and recompression determine whether the leaked bytes remain recoverable.

CVSS severity5.3
Medium
EPSS probability0.53%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in OpenSlide before 4.0.1 allows remote authenticated users to read heap data via crafted TIFF slides. The indirect TIFF tile path requests a full-height destination for a partial bottom tile row, causing openslide_read_region() to return uninitialized heap bytes as pixels. Exploitation requires libtiff 4.7.1 and a non-NDPI TIFF-based slide, while transparency handling and recompression determine whether the leaked bytes remain recoverable.

The record

CVE
CVE-2026-54604
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
OpenSlide
Product
OpenSlide
Classifications
CWE-908, CWE-758
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=< 4.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenSlide · OpenSlideversion=< 4.0.1

Published CVSS scores

2.3GitHub Security AdvisoryCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
5.3GitHub CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
CWE-758Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

Public exploit references

No public exploit references are available in this record.

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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