CVE-2026-84449 Details
Description
libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.19.6, Op_RGB24_32_to_YCbCr::convert_colorspace() stores image-plane strides in an integer width that can overflow for extremely large RGB images created through heif_image_create() and heif_image_add_plane(). The resulting wrapped stride causes the conversion loop in libheif/color-conversion/rgb2yuv.cc to compute an invalid input pointer and read beyond the allocated interleaved plane while heif_context_encode_image() performs RGB-to-YCbCr conversion. This can crash the encoding process. This issue is fixed in version 1.19.6.
A vulnerability in libheif, specifically in the color conversion from RGB24_32 to YCbCr, prior to version 1.19.6, allows for a memory access error that can cause a segmentation fault. This issue arises when extremely large RGB images are created, leading to an integer overflow in the image-plane strides. The wrapped stride causes the conversion loop to read beyond the allocated memory, creating an invalid input pointer. This vulnerability can crash the encoding process when the image is processed with the heif_context_encode_image function.
Users can upgrade to libheif version 1.19.6 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 18, 2026CISA-ADP
Assessed Sep 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/strukturag/libheif/security/advisories/GHSA-2c3g-p585-8rpq | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/strukturag/libheif/commit/e29953da30eb11aa1762df0bff3b36be4b22fbe3 | [email protected] | Source CodeVendor |
| https://github.com/strukturag/libheif/releases/tag/v1.19.6 | [email protected] | Release NotesVendor |
| https://github.com/strukturag/libheif/security/advisories/GHSA-2c3g-p585-8rpq | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
| CWE-190 | Integer Overflow or Wraparound | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| libheif | < 1.19.6 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 22, 2026 | CVE Modified | CISA-ADP |
| Sep 18, 2026 | New CVE Received | [email protected] |