Bug 2504754 (CVE-2026-45382)

Summary: CVE-2026-45382 libde265: libde265: Denial of Service due to heap-buffer-overflow when processing malformed H.265 video
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gtanzill, jbuscemi
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libde265, an open-source implementation of the H.265 video codec. A remote attacker could exploit this by providing a malformed H.265 video stream. Processing this malformed data can lead to a heap-buffer-overflow read, which may cause a denial of service (DoS) by crashing the application.
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Description OSIDB Bzimport 2026-07-21 22:03:16 UTC
libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.19, `decoder_context::decode_slice_unit_tiles` (libde265/decctx.cc:920) reads `pps.CtbAddrRStoTS[ctbAddrRS]` at line 966 where `ctbAddrRS = ctbY * ctbsWidth + ctbX` is computed from PPS-supplied `colBd[]`/`rowBd[]` arrays without validating the result against `CtbAddrRStoTS.size() == sps->PicSizeInCtbsY`. A malformed PPS that passes `set_derived_values` but encodes geometry inconsistent with the SPS produces a `ctbAddrRS` past the allocation, causing a 4-byte heap-buffer-overflow READ. Version 1.0.19 fixes the issue.