How severe is CVE-2026-47178?

CVE-2026-47178 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability high.

Is CVE-2026-47178 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-47178?

CVE-2026-47178 affects Struktur Libheif. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-47178?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-47178 published?

CVE-2026-47178 was published on 2026-07-21 and last updated on 2026-07-27.

CVE-2026-47178

CVE-2026-47178 is a medium-severity vulnerability in Struktur Libheif with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Struktur Libheif
Published: 2026-07-21
Last modified: 2026-07-27

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.

Frequently asked questions

What is CVE-2026-47178?: 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.
How severe is CVE-2026-47178?: CVE-2026-47178 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability high.
Is CVE-2026-47178 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-47178?: CVE-2026-47178 affects Struktur Libheif. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-47178?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-47178 published?: CVE-2026-47178 was published on 2026-07-21 and last updated on 2026-07-27.

References

https://github.com/strukturag/libheif/security/advisories/GHSA-5x55-x5pf-9c6g

Affected products (1)

cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*

More vulnerabilities in Struktur Libheif

CVE-2026-32740 — High (CVSS 8.8): libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow…
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CVE-2023-49463 — High (CVSS 8.8): libheif v1.17.5 was discovered to contain a segmentation violation via the function find_exif_tag at /libheif/exif.cc.
CVE-2023-49462 — High (CVSS 8.8): libheif v1.17.5 was discovered to contain a segmentation violation via the component /libheif/exif.cc.
CVE-2023-49460 — High (CVSS 8.8): libheif v1.17.5 was discovered to contain a segmentation violation via the function…
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