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CVE-2026-49337— libde265 has an unbounded memory leak via orphaned slice headers in `read_slice_NAL`

Quick assessment

Affected
strukturag libde265
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

strukturag libde265是strukturag公司的一个处理HEVC视频编码的库。 strukturag libde265 1.0.20之前版本存在资源管理错误漏洞，该漏洞源于 decoder_context::read_slice_NAL() 将切片标头附加到无活动图像单元的已完成的图片对象上，导致攻击者控制的未绑定的堆增长，从而可能造成资源耗尽。

CVSS 4.3 · Medium EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
strukturag libde265 < 1.0.20 affected
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I. Basic Information for CVE-2026-49337

Vulnerability Information
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Vulnerability Title
libde265 has an unbounded memory leak via orphaned slice headers in `read_slice_NAL`
Source: CVE Program / CVE List V5
Vulnerability Description
libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted sequence of H.265 NAL units causes `decoder_context::read_slice_NAL()` (`libde265/decctx.cc:481`) to attach slice headers to a finished picture object that has no active image unit, resulting in attacker-controlled unbounded heap growth. The retained headers are never freed until the picture is released, which may not happen during continuous streaming. Version 1.0.20 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
strukturag libde265 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
strukturag libde265是strukturag公司的一个处理HEVC视频编码的库。 strukturag libde265 1.0.20之前版本存在资源管理错误漏洞，该漏洞源于 decoder_context::read_slice_NAL() 将切片标头附加到无活动图像单元的已完成的图片对象上，导致攻击者控制的未绑定的堆增长，从而可能造成资源耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
strukturag libde265 < 1.0.20 -

II. Public POCs for CVE-2026-49337

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III. Intelligence Information for CVE-2026-49337

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Patches & Fixes for CVE-2026-49337 (1)

Vendor Advisories for CVE-2026-49337 (1)

Same Patch Batch · strukturag · 2026-06-19 · 4 CVEs total

CVE-2026-49346 7.1 HIGH libde265 has a heap buffer overflow in de265_image_get_buffer via SPS dimension integer ov
CVE-2026-49295 7.1 HIGH libde265 has an out-of-bounds write in process_reference_picture_set via predicted short-t
CVE-2026-49271 6.5 MEDIUM libheif: Wrapped icef compressed-unit range check causes out-of-bounds read in uncompresse

IV. Related Vulnerabilities

Same product: libde265
Same vendor: strukturag
Same weakness: CWE-770

V. Comments for CVE-2026-49337

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