Bug 2564466 (CVE-2026-120208)

Summary: CVE-2026-120208 libheif: libheif: Arbitrary code execution via heap-based buffer overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in libheif. This vulnerability allows a remote attacker to achieve arbitrary code execution or cause a denial of service (DoS) by supplying a specially crafted High Efficiency Image File Format (HEIF) image. Due to improper handling of color components with unequal bit depths in the uncompressed image decoder, processing the image triggers a heap-based buffer overflow, writing data outside allocated memory boundaries.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2565442, 2565443, 2565444, 2565445, 2565446    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-31 17:31:21 UTC 
libheif 1.18.0 before 1.23.3 contains a heap-based buffer overflow vulnerability in unc_decoder_mixed_interleave::processTile() that allows attackers to write out of bounds by supplying chroma components with unequal bit depths. Attackers can craft a HEIF file declaring, for example, 16-bit Cb and 8-bit Cr to trigger file-controlled heap writes past the Cr plane, potentially achieving code execution in image-processing pipelines.