TI-2026-25232 Aliases CVE-2026-32740

libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing

MEDIUM 41CWE-787Published 2026-05-19 · Updated 2026-07-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled data past the end of a chroma plane heap allocation by crafting a HEIF/AVIF file with a 1×4 grid of odd-height tiles. The overflow is triggered during normal image decoding with default build configuration. The written bytes are chroma (Cb/Cr) pixel values from the attacking tile, giving the attacker full control over the overflow content. This issue has been fixed in version 1.22.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00684 52nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed libheif (strukturag): 1.22.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
strukturag	libheif	before 1.22.0	1.22.0	Patch available	CNA

libheif Vendorstrukturag Affected before 1.22.0 Fixed in 1.22.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:struktur:libheif::::::::	before 1.22.0	Vulnerable	strukturag

cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:* Versions before 1.22.0 Vulnerable ·strukturag

Remediation

Fix · CNA libheif (strukturag) Fixed in 1.22.0

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 1 product

Red Hat Enterprise Linux 10

Timeline

2026-10-02 Threatist record created from CVE-2026-32740

References

Exploit 1

https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6j

Other 1

https://github.com/strukturag/libheif/releases/tag/v1.22.0

TI-2023-27020 libheif v1.17.5 was discovered to contain a segmentation violation via the function… CVSS 3.1HIGH 8.8
TI-2026-34830 libheif Vulnerable to Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel Plane Allocation CVSS 3.1HIGH 7.5
TI-2024-16668 libheif <= 1.17.6 contains a memory leak in the function JpegEncoder::Encode. CVSS 3.1HIGH 7.5
TI-2024-27575 In Libheif 1.17.6, insufficient checks in ImageOverlay::parse() decoding a heif file… CVSS 3.1HIGH 8.1
TI-2026-35472 libheif: heap OOB read in ImageItem_Grid::decode_grid_tile via irot-induced tile-coordinate underflow CVSS 3.1HIGH 7.1
TI-2026-35212 libheif has a NULL pointer dereference in heif_image_handle_get_image_tiling for malformed unci image missing ispe CVSS 4.0MEDIUM 6.9

See all 28 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences