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CVE-2026-53702— Gstreamer1-plugins-bad-free: gstreamer: stack buffer overflow in h.265 buffering period sei parser

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
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.

gst-plugins-bad是GStreamer开源的一个GStreamer插件。 gst-plugins-bad存在缓冲区错误漏洞，该漏洞源于H.265编解码器解析器库在解析缓冲期SEI消息时使用错误的循环边界，导致写入栈分配的CPB延迟数组边界之外，精心构造的H.265视频文件或流可能导致崩溃或栈内存损坏。

CVSS 6.5 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 4

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-53702

Vulnerability Information
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Vulnerability Title
Gstreamer1-plugins-bad-free: gstreamer: stack buffer overflow in h.265 buffering period sei parser
Source: CVE Program / CVE List V5
Vulnerability Description
A stack buffer overflow flaw was found in the GStreamer H.265 codec parser library (gst-plugins-bad). When parsing a buffering period SEI message, the parser uses an incorrect loop bound derived from cpb_cnt_minus1[i] (the loop index) instead of the sub-layer 0 CPB count cpb_cnt_minus1[0] from the referenced Sequence Parameter Set. A crafted H.265 video file or stream can cause the parser to write beyond the bounds of stack-allocated CPB delay arrays, resulting in a crash or potential stack memory corruption.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
gst-plugins-bad 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gst-plugins-bad是GStreamer开源的一个GStreamer插件。 gst-plugins-bad存在缓冲区错误漏洞，该漏洞源于H.265编解码器解析器库在解析缓冲期SEI消息时使用错误的循环边界，导致写入栈分配的CPB延迟数组边界之外，精心构造的H.265视频文件或流可能导致崩溃或栈内存损坏。
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
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-53702

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III. Intelligence Information for CVE-2026-53702

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Vendor Advisories for CVE-2026-53702 (2)

Same Patch Batch · Red Hat · 2026-06-11 · 5 CVEs total

CVE-2026-11774 7.6 HIGH 389-ds-base: 389-ds-base: integer overflow in sasl packet length bypasses size limit leadi
CVE-2026-53701 6.5 MEDIUM Gstreamer1-plugins-bad-free: gstreamer: out-of-bounds write in h.266/vvc pps picture parti
CVE-2026-11850 5.0 MEDIUM Krb5: krb5: integer underflow in berval2tl_data() leads to heap out-of-bounds read
CVE-2026-11986 4.9 MEDIUM Keycloak-rest-admin-ui-ext: authorization bypass vulnerability in the admin-ui-ext bulk ro

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-787

V. Comments for CVE-2026-53702

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