CVE-2026-54241Network attack vectorHinoki check available

Heap disclosure and crash via undersized SAO allocation

Published Sep 11, 2026 · Updated Sep 11, 2026

Heap buffer overflow in libde265 before 1.1.1 allows remote attackers to disclose heap data or crash decoding via crafted HEVC streams. In apply_sample_adaptive_offset_sequential(), signed 32-bit multiplication wraps the luma buffer size, causing a small allocation that later reads use with the full stride. The stream must declare very large dimensions, 16-bit luma, and SAO; successful processing can copy heap contents into decoded pixels or terminate the consuming application.

CVSS severity7.4
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Heap buffer overflow in libde265 before 1.1.1 allows remote attackers to disclose heap data or crash decoding via crafted HEVC streams. In apply_sample_adaptive_offset_sequential(), signed 32-bit multiplication wraps the luma buffer size, causing a small allocation that later reads use with the full stride. The stream must declare very large dimensions, 16-bit luma, and SAO; successful processing can copy heap contents into decoded pixels or terminate the consuming application.

The record

CVE
CVE-2026-54241
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Struktur AG
Product
libde265
Classifications
CWE-190, CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=< 1.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Struktur AG · libde265version=< 1.1.1

Published CVSS scores

7.4GitHub Security AdvisoryCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CWE-122Heap-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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