CVE-2026-87766 (GCVE-0-2026-87766)
Vulnerability from cvelistv5
Published
2026-09-09 08:34
Modified
2026-10-19 23:12
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Summary
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.
References
Impacted products
| Vendor | Product | Version | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected: 0:0.10.0-5.el10_2 < * cpe:/o:redhat:enterprise_linux:10.2 |
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\"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:85317\", \"name\": \"RHSA-2026:85317\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:85319\", \"name\": \"RHSA-2026:85319\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:85322\", \"name\": \"RHSA-2026:85322\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:85324\", \"name\": \"RHSA-2026:85324\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:85325\", \"name\": \"RHSA-2026:85325\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2026-87766\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugs.debian.org/1145655\"}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2530542\", \"name\": \"RHBZ#2530542\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://github.com/containers/bubblewrap/releases/tag/v0.12.0\"}, {\"url\": \"https://github.com/containers/bubblewrap/security/advisories/GHSA-pxhw-h44j-8pfx\"}, {\"url\": \"https://www.openwall.com/lists/oss-security/2026/08/27/7\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Do not create files on untrusted content with unpatched bwrap. Do not install untrusted Flatpaks. No upstream fix for older setuid builds.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-59\", \"description\": \"Improper Link Resolution Before File Access (\u0027Link Following\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-10-19T23:12:32.561Z\"}, \"x_redhatCweChain\": \"CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)\"}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-87766\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T23:12:32.561Z\", \"dateReserved\": \"2026-09-09T08:08:33.568Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-09-09T08:34:35.359Z\", \"assignerShortName\": \"redhat\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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