CVE-2026-47178 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-47178HIGH

strukturag libheif — libheif has Heap Out Of Bounds Write in unci subsystem

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  H  H  H    7.8   .0020   10.0     —

AFFECTED
  Product  Versions               Fixed
  libheif  >= 1.19.0, < 1.22.0 –  —

TIMELINE
  May 18  Reserved by GitHub_M
  Jul 21  EXPLOIT PUBLISHED — CVE-2026-47178 (strukturag libheif). Public exploit reference added.
  Jul 21  Published (CNA: GitHub_M)
  Jul 27  EXPLOIT PUBLISHED — CVE-2026-47178 (strukturag libheif). Public exploit reference added.

CWE-787 · CNA: GitHub_M · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.19.0 through 1.21.2, a crafted HEIF file (uncompressed `unci` codec, tiled, component-interleaved, 4:2:0) triggers a heap out-of-bounds write in libheif's uncompressed tile decoder. The write overwrites the C++ vtable pointer of an adjacent `unc_decoder_component_interleave` object; the next virtual call dispatches to an attacker-chosen address. Version 1.22.0 patches the issue.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
May 18, 2026	Reserved	Reserved by GitHub_M
July 21, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-47178 (strukturag libheif). Public exploit reference added.
July 21, 2026	Published	Published (CNA: GitHub_M)
July 27, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-47178 (strukturag libheif). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
strukturag	libheif	—	>= 1.19.0, < 1.22.0	—

Weaknesses

CWE-787

References (1)

https://github.com/strukturag/libheif/security/advisories/GHSA-5x55-x5pf-9c6g [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-47178 at cve.org

Vendors: strukturag

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-47178 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.