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TI-2026-57994 Aliases CVE-2026-84383

libheif: Heap buffer overflow in `scale_nearest_neighbor()` via duplicate Alpha planes from nested `iden`/`auxl` items

Priority HIGH 82CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
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. From 1.22.0 until 1.23.2, a crafted HEIF, HEIC, or AVIF item graph using nested iden and auxl references can make HeifPixelImage::transfer_channel_from_image_as() append duplicate Alpha planes with different bit depths to m_storage. HeifPixelImage::scale_nearest_neighbor() in libheif/image/pixelimage.cc allocates the destination Alpha plane using the first plane's 8-bit depth, then iterates a later 10-bit or 12-bit Alpha component and writes uint16_t samples into the same 8-bit allocation. The output geometry controls the overflow extent and the encoded sample values control the data written, allowing a remote file processed by heif_decode_image() to cause a heap out-of-bounds write. This issue is fixed in version 1.23.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00717 54th percentileScored 2026-11-07
Fix Fixed libheif (strukturag): 1.23.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
strukturaglibheif1.22.0 to before 1.23.21.23.2Patch availableCNA
  • libheif Vendorstrukturag Affected 1.22.0 to before 1.23.2 Fixed in 1.23.2 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 1.23.2

Vendor assessments

Red Hat

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

Not affected: 5 products
  • Red Hat Build of Podman Desktop
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat OpenShift AI (RHOAI)
  • Red Hat Trusted Artifact Signer

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84383
  2. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Other 3

  • 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
  • TI-2026-34830 libheif Vulnerable to Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel Plane Allocation 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