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TI-2026-25341 Aliases CVE-2026-32882

libheif: Heap Buffer OOB Read in overlay compositing due to wrong alpha stride

Priority MEDIUM 64CWE-125Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap buffer over-read in HeifPixelImage::overlay() in libheif/pixelimage.cc. When compositing an overlay image (iovl) whose child image has a different bit depth for the alpha channel than for the color channels, the function indexes into the alpha plane using the color channel stride (in_stride) instead of the previously retrieved alpha_stride, causing reads past the end of the alpha buffer (up to 3,123 bytes for a 100×50 image with 10-bit color and 8-bit alpha). A crafted HEIF file can exploit this to cause a denial of service (crash) or potentially disclose adjacent heap memory through leaked bytes embedded in the decoded output pixels. This issue has been fixed in versionThis issue has been fixed in version 1.22.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00708 53rd percentileScored 2026-11-07
Fix Fixed libheif (strukturag): 1.22.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
strukturaglibheifbefore 1.22.01.22.0Patch availableCNA
  • libheif Vendorstrukturag Affected before 1.22.0 Fixed in 1.22.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*——strukturag
  • cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:* Versions — — ·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

  1. 2026-10-02 Threatist record created from CVE-2026-32882

References

Other 2

  • TI-2026-57994 libheif: Heap buffer overflow in `scale_nearest_neighbor()` via duplicate Alpha planes from nested `iden`/`auxl` items CVSS 3.1CRITICAL 9.8
  • TI-2026-25594 NULL Pointer Dereference in libde265 CVSS 4.0HIGH 8.7
  • TI-2023-27026 Libde265 v1.0.14 was discovered to contain a global buffer overflow vulnerability in the… CVSS 3.1HIGH 8.8
  • TI-2023-27020 libheif v1.17.5 was discovered to contain a segmentation violation via the function… CVSS 3.1HIGH 8.8
  • TI-2026-58037 Resource allocation without limits in strukturag libheif CVSS 3.1HIGH 7.5
  • TI-2026-57995 libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoS CVSS 3.1HIGH 7.5
See all 113 →

Sources

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