CVE-2026-62377Network attack vector

Service interrupt via empty track lookup

Published Aug 18, 2026 · Updated Aug 19, 2026

Denial of service in libheif before 1.23.1 allows attackers to crash applications via a crafted HEIF sequence file. heif_context_read_from_memory() can accept an msf1 sequence that leaves the context with no registered tracks, and HeifContext::get_track() then performs assert(has_sequence()) before its normal error return path. Calls through the documented heif_context_get_track(ctx, 0) API are sufficient; assert-enabled builds abort with SIGABRT, and release builds can dereference m_tracks.begin() on an empty map and crash.

CVSS severity4.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in libheif before 1.23.1 allows attackers to crash applications via a crafted HEIF sequence file. heif_context_read_from_memory() can accept an msf1 sequence that leaves the context with no registered tracks, and HeifContext::get_track() then performs assert(has_sequence()) before its normal error return path. Calls through the documented heif_context_get_track(ctx, 0) API are sufficient; assert-enabled builds abort with SIGABRT, and release builds can dereference m_tracks.begin() on an empty map and crash.

The record

CVE
CVE-2026-62377
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
Struktur AG
Product
libheif
Classifications
CWE-617, CWE-908
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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=< 1.23.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Struktur AG · libheifversion=< 1.23.1

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 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-617Reachable Assertion
CWE-908Use of Uninitialized Resource

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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