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CVE-2026-87766— Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup

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.

Containers Bubblewrap是Containers组织的一款提供异步消息传递与中间件能力的轻量级消息代理软件。 Containers Bubblewrap存在后置链接漏洞，该漏洞源于Bubblewrap沙箱设置期间创建文件或目录时可通过/oldroot跟随父符号链接到主机，可能导致以启动用户身份将攻击者选择的路径写入沙箱外。

CVSS 8.8 · High EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-87766

Vulnerability Information
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Vulnerability Title
Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in bubblewrap. During sandbox setup, creating files or directories under the new root can follow a parent symlink onto the host via /oldroot, writing attacker-chosen paths outside the sandbox as the launching user. This happens before the sandboxed process starts. This issue is GHSA-pxhw-h44j-8pfx. It is fixed in bubblewrap 0.12.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
Containers Bubblewrap 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Containers Bubblewrap是Containers组织的一款提供异步消息传递与中间件能力的轻量级消息代理软件。 Containers Bubblewrap存在后置链接漏洞，该漏洞源于Bubblewrap沙箱设置期间创建文件或目录时可通过/oldroot跟随父符号链接到主机，可能导致以启动用户身份将攻击者选择的路径写入沙箱外。
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 0:0.10.0-5.el10_2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:0.10.0-3.el10_0.4 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat Red Hat Enterprise Linux 8 0:0.4.0-3.el8_10 ~ * cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:0.4.0-3.el8_4 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:0.4.0-3.el8_4 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:0.4.0-3.el8_6 ~ * cpe:/o:redhat:rhel_aus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:0.4.0-3.el8_6 ~ * cpe:/o:redhat:rhel_aus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:0.4.0-3.el8_8 ~ * cpe:/o:redhat:rhel_e4s:8.8::baseos
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:0.4.0-3.el8_8 ~ * cpe:/o:redhat:rhel_e4s:8.8::baseos
Red Hat Red Hat Enterprise Linux 9 0:0.6.3-1.el9_8.1 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:0.4.1-7.el9_2.1 ~ * cpe:/o:redhat:rhel_e4s:9.2::baseos
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:0.4.1-7.el9_4.1 ~ * cpe:/o:redhat:rhel_e4s:9.4::baseos
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:0.4.1-8.el9_6.1 ~ * cpe:/o:redhat:rhel_eus:9.6::baseos
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1

II. Public POCs for CVE-2026-87766

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III. Intelligence Information for CVE-2026-87766

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Vendor Advisories for CVE-2026-87766 (14)

Mailing List Discussions for CVE-2026-87766 (1)

Vendor Pages for CVE-2026-87766 (1)

Same Patch Batch · Red Hat · 2026-09-09 · 8 CVEs total

CVE-2026-87874 8.1 HIGH Community.general: community.general: memcached cache plugin deserializes untrusted pickle
CVE-2026-18147 8.1 HIGH Freeipa: ipa: freeipa/idm: cross-site scripting vulnerability allows arbitrary code execut
CVE-2026-87853 7.5 HIGH Sssd: sssd: idp authentication prefix comparison allows cross-user impersonation
CVE-2026-87872 6.8 MEDIUM Community.general: community.general: ocapi module_utils (ocapi_command, ocapi_info) hardc
CVE-2026-19729 4.9 MEDIUM Keycloak-services: keycloak-services: incomplete fix for arbitrary filesystem path probing
CVE-2026-87875 4.3 MEDIUM Cups: openprinting cups: heap out-of-bounds read in cupsutf32toutf8() via missing source-l
CVE-2026-87876 3.0 LOW Cups: openprinting cups: remaining case-insensitive username matching in scheduler side pa

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-59