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CVE-2026-59691— Gstreamer1-plugins-bad-free: gstreamer: rfbsrc/librfb hextile heap out-of-bounds write with 16bpp framebuffer

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.

GStreamer是GStreamer组织开源的一套用于处理流媒体的框架。 GStreamer存在缓冲区错误漏洞，该漏洞源于rfbsrc插件中的堆缓冲区溢出问题，当客户端连接到恶意的RFB/VNC服务器时，Hextile背景填充路径将32位像素值写入为16位像素分配的缓冲区，可能导致拒绝服务和内存损坏。

CVSS 7.1 · High EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 0:1.26.7-2.el10_2.6< * unaffected
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.24.11-3.el10_0.6< * unaffected
Red Hat Red Hat Enterprise Linux 6 any affected
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.10.4-7.el7_9< * unaffected
0:0.10.23-26.el7_9< * unaffected
Red Hat Red Hat Enterprise Linux 8 0:1.16.1-9.el8_10.1< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.16.1-4.el8_4.4< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:1.16.1-4.el8_4.4< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:1.16.1-4.el8_6.4< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:1.16.1-4.el8_6.4< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:1.16.1-4.el8_8.4< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:1.16.1-4.el8_8.4< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:1.22.12-7.el9_8.3< * unaffected
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.18.4-9.el9_2.5< * unaffected
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.22.1-6.el9_4.6< * unaffected
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.22.12-5.el9_6.6< * unaffected
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I. Basic Information for CVE-2026-59691

Vulnerability Information
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Vulnerability Title
Gstreamer1-plugins-bad-free: gstreamer: rfbsrc/librfb hextile heap out-of-bounds write with 16bpp framebuffer
Source: CVE Program / CVE List V5
Vulnerability Description
A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit pixels. This type mismatch causes an out-of-bounds heap write that can lead to denial of service (process crash) and potential 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:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
GStreamer 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GStreamer是GStreamer组织开源的一套用于处理流媒体的框架。 GStreamer存在缓冲区错误漏洞，该漏洞源于rfbsrc插件中的堆缓冲区溢出问题，当客户端连接到恶意的RFB/VNC服务器时，Hextile背景填充路径将32位像素值写入为16位像素分配的缓冲区，可能导致拒绝服务和内存损坏。
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 0:1.26.7-2.el10_2.6 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.24.11-3.el10_0.6 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.10.4-7.el7_9 ~ * cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:0.10.23-26.el7_9 ~ * cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 8 0:1.16.1-9.el8_10.1 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.16.1-4.el8_4.4 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:1.16.1-4.el8_4.4 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:1.16.1-4.el8_6.4 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:1.16.1-4.el8_6.4 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:1.16.1-4.el8_8.4 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:1.16.1-4.el8_8.4 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 9 0:1.22.12-7.el9_8.3 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.18.4-9.el9_2.5 ~ * cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.22.1-6.el9_4.6 ~ * cpe:/a:redhat:rhel_e4s:9.4::appstream
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.22.12-5.el9_6.6 ~ * cpe:/a:redhat:rhel_eus:9.6::appstream
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6

II. Public POCs for CVE-2026-59691

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III. Intelligence Information for CVE-2026-59691

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Patches & Fixes for CVE-2026-59691 (1)

Vendor Advisories for CVE-2026-59691 (14)

Other References for CVE-2026-59691 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-59691

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