Vulnerability-Lookup

RHSA-2026:85308

Vulnerability from csaf_redhat - Published: 2026-10-19 20:59 - Updated: 2026-10-19 23:40

Summary

Red Hat Security Advisory: bubblewrap security update

Severity

Important

Notes

Topic: An update for bubblewrap is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Bubblewrap (/usr/bin/bwrap) is a core execution engine for unprivileged containers that works as a setuid binary on kernels without user namespaces. Security Fix(es): * bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup (CVE-2026-87766) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-87766

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.

8.8 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.s390x	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:85308	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2530542	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-87766	self
https://bugzilla.redhat.com/show_bug.cgi?id=2530542	external
https://www.cve.org/CVERecord?id=CVE-2026-87766	external
https://nvd.nist.gov/vuln/detail/CVE-2026-87766	external
https://bugs.debian.org/1145655	external
https://github.com/containers/bubblewrap/releases…	external
https://github.com/containers/bubblewrap/security…	external
https://www.openwall.com/lists/oss-security/2026/…	external

Acknowledgments

geeknik

JSON

To clipboard

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        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw in bubblewrap is rated as Important because it allows a local attacker to write files outside of a sandbox on the host system. This occurs during the initial setup phase, before any sandboxed process begins, by exploiting symlink traversal when processing untrusted application images, such as those used by Flatpak. While the created files are written with the privileges of the user launching bubblewrap, this can lead to unintended file creation on the host filesystem.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.aarch64",
          "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.ppc64le",
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          "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.x86_64",
          "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.aarch64",
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          "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.s390x",
          "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.x86_64",
          "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.aarch64",
          "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.ppc64le",
          "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.s390x",
          "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-87766"
        },
        {
          "category": "external",
          "summary": "RHBZ#2530542",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2530542"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-87766",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-87766"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-87766",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87766"
        },
        {
          "category": "external",
          "summary": "https://bugs.debian.org/1145655",
          "url": "https://bugs.debian.org/1145655"
        },
        {
          "category": "external",
          "summary": "https://github.com/containers/bubblewrap/releases/tag/v0.12.0",
          "url": "https://github.com/containers/bubblewrap/releases/tag/v0.12.0"
        },
        {
          "category": "external",
          "summary": "https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx",
          "url": "https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx"
        },
        {
          "category": "external",
          "summary": "https://www.openwall.com/lists/oss-security/2026/08/27/7",
          "url": "https://www.openwall.com/lists/oss-security/2026/08/27/7"
        }
      ],
      "release_date": "2026-09-09T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-19T20:59:17+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.aarch64",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.s390x",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.src",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.x86_64",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.aarch64",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.s390x",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.x86_64",
            "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.aarch64",
            "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.s390x",
            "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:85308"
        },
        {
          "category": "workaround",
          "details": "Do not create files on untrusted content with unpatched bwrap. Do not install untrusted Flatpaks. No upstream fix for older setuid builds.",
          "product_ids": [
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.aarch64",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.s390x",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.src",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.x86_64",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.aarch64",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.s390x",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.x86_64",
            "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.aarch64",
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            "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.s390x",
            "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.aarch64",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.s390x",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.src",
            "BaseOS-10.2.Z:bubblewrap-0:0.10.0-5.el10_2.x86_64",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.aarch64",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.ppc64le",
            "BaseOS-10.2.Z:bubblewrap-debuginfo-0:0.10.0-5.el10_2.s390x",
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            "BaseOS-10.2.Z:bubblewrap-debugsource-0:0.10.0-5.el10_2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup"
    }
  ]
}

CVE-2026-87766 (GCVE-0-2026-87766)

Vulnerability from cvelistv5 – Published: 2026-09-09 08:34 – Updated: 2026-09-22 23:07

Title

Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbox during setup

Summary

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-09 14:03 UTC

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

redhat redhat root Scorecard

References

8 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-87766	vdb-entryx_refsource_REDHAT
https://bugs.debian.org/1145655
https://bugzilla.redhat.com/show_bug.cgi?id=2530542	issue-trackingx_refsource_REDHAT
https://github.com/containers/bubblewrap/releases…
https://github.com/containers/bubblewrap/security…
https://www.openwall.com/lists/oss-security/2026/…
http://www.openwall.com/lists/oss-security/2026/09/09/3
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
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
Red Hat	Red Hat Hardened Images	cpe:/a:redhat:hummingbird:1

Date Public

2026-09-09 00:00

Credits

Red Hat would like to thank geeknik for reporting this issue.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2026:85308

CVE-2026-87766 (GCVE-0-2026-87766)

Tags

Sightings

Nomenclature

Related by attack behaviour