CVE-2026-53496Public exploitNetwork attack vectorHinoki check available

Denial of service via unchecked ISO-BMFF reads

Published Sep 14, 2026 · Updated Sep 14, 2026

Denial of service in Mattias Wallander ExifReader before 4.40.1 allows remote attackers to abort requests via crafted HEIC or AVIF files. The ISO-BMFF findMetaBox and parseBox path accepts an eight-byte box header, then reads full-box or extended-size fields beyond the DataView. Exploitation requires an application to parse attacker-supplied HEIC or AVIF data without catching the RangeError; one file can abort its request or worker.

CVSS severity5.3
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in Mattias Wallander ExifReader before 4.40.1 allows remote attackers to abort requests via crafted HEIC or AVIF files. The ISO-BMFF findMetaBox and parseBox path accepts an eight-byte box header, then reads full-box or extended-size fields beyond the DataView. Exploitation requires an application to parse attacker-supplied HEIC or AVIF data without catching the RangeError; one file can abort its request or worker.

The record

CVE
CVE-2026-53496
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Mattias Wallander
Product
ExifReader
Classifications
CWE-755, CWE-248, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 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=< 4.40.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mattias Wallander · ExifReaderversion=< 4.40.1

Published CVSS scores

5.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
CWE-248Uncaught Exception
T1499Endpoint Denial of Service

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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