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libde265 EUVDEUVD-2026-38079

| CVE-2026-49295 HIGH
Out-of-bounds Write (CWE-787)
2026-06-19 GitHub_M
Memory Corruption Buffer Overflow Libde265
7.1
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
vuln.today AI
7.1 HIGH

Network-delivered crafted bitstream, no auth, but requires the user to open the file (UI:R); OOB write yields integrity tampering and high availability impact with no direct confidentiality disclosure.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

Lifecycle Timeline

3
Patch available
Jun 19, 2026 - 23:17 EUVD
Source Code Evidence Fetched
Jun 19, 2026 - 20:45 vuln.today
Analysis Generated
Jun 19, 2026 - 20:45 vuln.today

DescriptionCVE.org

libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted H.265 bitstream can cause an out-of-bounds array write in decoder_context::process_reference_picture_set() (libde265/decctx.cc:1376). The root cause is a missing aggregate bound check on predicted short-term reference picture set entries. Individual list sizes are validated, but the combined count after predicted RPS construction can exceed the 16-entry PocStFoll array, writing at index 16. Version 1.0.20 patches the issue.

AnalysisAI

Out-of-bounds write in libde265 prior to version 1.0.20 allows remote attackers to corrupt memory by tricking a user into processing a maliciously crafted H.265 bitstream. The flaw resides in the short-term reference picture set handling and can lead to denial of service or potential code execution in any application that links libde265 for HEVC decoding. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malformed H.265 RPS bitstream
Delivery
Deliver via .heic/.mp4 email or web link
Exploit
Victim opens file in libde265-backed viewer
Execution
Predicted RPS construction overflows NumDeltaPocs past 16
Persist
Out-of-bounds write to PocStFoll[16] corrupts decoder context
Impact
Process crash or potential code execution
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Vulnerability AssessmentAI

Exploitation Victim must open or render an attacker-supplied H.265 bitstream (raw stream, .heic, or HEVC-encoded video) using an application built against libde265 prior to 1.0.20; UI:R in the CVSS vector confirms user interaction is required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H) accurately reflects a client-side parsing bug: network-reachable via any application that decodes attacker-supplied HEVC content, but requires user interaction such as opening a file or visiting a page. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious H.265 bitstream (e.g., embedded in a .heic image or .mp4 video) where the predicted short-term reference picture set construction pushes NumDeltaPocs to 17, and delivers it via email attachment, web download, or messaging app. When the victim opens the file in a viewer that uses libde265 (directly or via libheif), the decoder writes past the 16-entry PocStFoll array, corrupting adjacent decoder state and crashing the process or potentially enabling code execution. …
Remediation Vendor-released patch: libde265 1.0.20 - upgrade to this version, which adds an aggregate NumDeltaPocs > MAX_NUM_REF_PICS check in read_short_term_ref_pic_set() (commit 691f3a3c55b3d32478c4a49895dee061a282652b). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all systems using libde265 (check video applications, media servers, and codec library dependencies for versions prior to 1.0.20). …

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Libde265 v1.0.14 was discovered to contain a global buffer overflow vulnerability in the read_coding_unit function at sl
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Libde265 v1.0.14 was discovered to contain a heap-buffer-overflow vulnerability in the derive_spatial_luma_vector_predic
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Libde265 v1.0.11 was discovered to contain a heap buffer overflow via the function derive_collocated_motion_vectors at m
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Heap Buffer Overflow vulnerability in Libde265 v1.0.15 allows attackers to crash the application via crafted payload to

CVE-2023-27102 MEDIUM POC
6.5 Mar 15

Libde265 v1.0.11 was discovered to contain a segmentation violation via the function decoder_context::process_slice_segm
CVE-2023-24751 MEDIUM POC
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libde265 v1.0.10 was discovered to contain a NULL pointer dereference in the mc_chroma function at motion.cc. Rated medi
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Libde265 v1.0.8 was discovered to contain a heap-buffer-overflow vulnerability via put_unweighted_pred_16_fallback in fa
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Libde265 v1.0.8 was discovered to contain a heap-buffer-overflow vulnerability via put_epel_16_fallback in fallback-moti

Same weakness CWE-787 – Out-of-bounds Write

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Same technique Memory Corruption

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EUVD-2026-38079 vulnerability details – vuln.today
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