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TI-2026-59901 Aliases CVE-2026-87766

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

Priority LOW 39CWE-59Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00211 11th percentileScored 2026-11-07
Fix Fixed Red Hat: 10 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Enterprise Linux 10—0.10.0-5.el10_2Patch availableCNA
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support—0.10.0-3.el10_0.4Patch availableCNA
Red HatRed Hat Enterprise Linux 8—0.4.0-3.el8_10Patch availableCNA
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support—0.4.0-3.el8_4Patch availableCNA
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On—0.4.0-3.el8_4Patch availableCNA
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support—0.4.0-3.el8_6Patch availableCNA
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On—0.4.0-3.el8_6Patch availableCNA
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service—0.4.0-3.el8_8Patch availableCNA
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions—0.4.0-3.el8_8Patch availableCNA
Red HatRed Hat Enterprise Linux 9—0.6.3-1.el9_8.1Patch availableCNA
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions—0.4.1-7.el9_2.1Patch availableCNA
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions—0.4.1-7.el9_4.1Patch availableCNA
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support—0.4.1-8.el9_6.1Patch availableCNA
Red HatRed Hat Hardened Images——Not affectedCNA
  • Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 0.10.0-5.el10_2 Patch available CNA
  • Red Hat Enterprise Linux 10.0 Extended Update Support VendorRed Hat Affected — Fixed in 0.10.0-3.el10_0.4 Patch available CNA
  • Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in 0.4.0-3.el8_10 Patch available CNA
  • Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support VendorRed Hat Affected — Fixed in 0.4.0-3.el8_4 Patch available CNA
  • Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On VendorRed Hat Affected — Fixed in 0.4.0-3.el8_4 Patch available CNA
  • Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support VendorRed Hat Affected — Fixed in 0.4.0-3.el8_6 Patch available CNA
  • Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On VendorRed Hat Affected — Fixed in 0.4.0-3.el8_6 Patch available CNA
  • Red Hat Enterprise Linux 8.8 Telecommunications Update Service VendorRed Hat Affected — Fixed in 0.4.0-3.el8_8 Patch available CNA
  • Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 0.4.0-3.el8_8 Patch available CNA
  • Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 0.6.3-1.el9_8.1 Patch available CNA
  • Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 0.4.1-7.el9_2.1 Patch available CNA
  • Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions VendorRed Hat Affected — Fixed in 0.4.1-7.el9_4.1 Patch available CNA
  • Red Hat Enterprise Linux 9.6 Extended Update Support VendorRed Hat Affected — Fixed in 0.4.1-8.el9_6.1 Patch available CNA
  • Red Hat Hardened Images VendorRed Hat Affected — Fixed in — Not affected CNA

CPE names CNA · 14

CPEVersionsRoleVendor
cpe:/o:redhat:enterprise_linux:10.210.2—Red Hat
cpe:/o:redhat:enterprise_linux_eus:10.010.0—Red Hat
cpe:/o:redhat:enterprise_linux:8::baseos8—Red Hat
cpe:/o:redhat:rhel_aus:8.4::baseos8.4—Red Hat
cpe:/o:redhat:rhel_eus_long_life:8.4::baseos8.4—Red Hat
cpe:/o:redhat:rhel_aus:8.6::baseos8.6—Red Hat
cpe:/o:redhat:rhel_eus_long_life:8.6::baseos8.6—Red Hat
cpe:/o:redhat:rhel_e4s:8.8::baseos8.8—Red Hat
cpe:/o:redhat:rhel_tus:8.8::baseos8.8—Red Hat
cpe:/o:redhat:enterprise_linux:9::baseos9—Red Hat
  • cpe:/o:redhat:enterprise_linux:10.2 Versions 10.2 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux_eus:10.0 Versions 10.0 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:8::baseos Versions 8 — ·Red Hat
  • cpe:/o:redhat:rhel_aus:8.4::baseos Versions 8.4 — ·Red Hat
  • cpe:/o:redhat:rhel_eus_long_life:8.4::baseos Versions 8.4 — ·Red Hat
  • cpe:/o:redhat:rhel_aus:8.6::baseos Versions 8.6 — ·Red Hat
  • cpe:/o:redhat:rhel_eus_long_life:8.6::baseos Versions 8.6 — ·Red Hat
  • cpe:/o:redhat:rhel_e4s:8.8::baseos Versions 8.8 — ·Red Hat
  • cpe:/o:redhat:rhel_tus:8.8::baseos Versions 8.8 — ·Red Hat
  • cpe:/o:redhat:enterprise_linux:9::baseos Versions 9 — ·Red Hat
Show 4 more CPE
CPEVersionsRoleVendor
cpe:/o:redhat:rhel_e4s:9.2::baseos9.2—Red Hat
cpe:/o:redhat:rhel_e4s:9.4::baseos9.4—Red Hat
cpe:/o:redhat:rhel_eus:9.6::baseos9.6—Red Hat
cpe:/a:redhat:hummingbird:11—Red Hat
  • cpe:/o:redhat:rhel_e4s:9.2::baseos Versions 9.2 — ·Red Hat
  • cpe:/o:redhat:rhel_e4s:9.4::baseos Versions 9.4 — ·Red Hat
  • cpe:/o:redhat:rhel_eus:9.6::baseos Versions 9.6 — ·Red Hat
  • cpe:/a:redhat:hummingbird:1 Versions 1 — ·Red Hat

Remediation

Red Hat 10 advisories

  • RHSA-2026:85309 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS (v. 9) bubblewrap-0.6.3-1.el9_8.1
  • RHSA-2026:85325 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) bubblewrap-0.4.1-8.el9_6.1
  • RHSA-2026:85322 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bubblewrap-0.4.1-7.el9_2.1
Show 7 more Red Hat advisories
  • RHSA-2026:85319 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bubblewrap-0.4.1-7.el9_4.1
  • RHSA-2026:85313 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bubblewrap-0.4.0-3.el8_8
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bubblewrap-0.4.0-3.el8_8
  • RHSA-2026:85306 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bubblewrap-0.4.0-3.el8_10
  • RHSA-2026:85324 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bubblewrap-0.4.0-3.el8_6
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bubblewrap-0.4.0-3.el8_6
  • RHSA-2026:85317 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bubblewrap-0.4.0-3.el8_4
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bubblewrap-0.4.0-3.el8_4
  • RHSA-2026:85312 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) bubblewrap-0.10.0-3.el10_0.4
  • RHSA-2026:85308 Released 2026-10-19 · Red Hat rating Important
    bubblewrap security update
    • Red Hat Enterprise Linux BaseOS (v. 10) bubblewrap-0.10.0-5.el10_2

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:85308
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:85306
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:85309
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:85317
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:85324
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:85313
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:85322
Red Hat Enterprise Linux BaseOS E4S (v.9.4)Fixed RHSA-2026:85319
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:85312
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:85325
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:85317
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:85324
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:85313
Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-87766
  2. 2026-10-20 Fix available: bubblewrap@0:0.10.0-3.el10_0.4, bubblewrap@0:0.10.0-5.el10_2, bubblewrap@0:0.4.0-3.el8_10 +7 · CNA
  3. 2026-10-20 10 new references · CNA
  4. 2026-10-20 Fix available: RHSA-2026:85309 · Red Hat
  5. 2026-10-20 Fix available: RHSA-2026:85306 · Red Hat
  6. 2026-10-20 Fix available: RHSA-2026:85308 · Red Hat
  7. 2026-10-20 Fix available: RHSA-2026:85324 · Red Hat
  8. 2026-10-20 Fix available: RHSA-2026:85317 · Red Hat
  9. 2026-10-20 Fix available: RHSA-2026:85313 · Red Hat
  10. 2026-10-20 Fix available: RHSA-2026:85319 · Red Hat
  11. 2026-10-20 Fix available: RHSA-2026:85325 · Red Hat
  12. 2026-10-20 Fix available: RHSA-2026:85322 · Red Hat
  13. 2026-10-20 Fix available: RHSA-2026:85312 · Red Hat
  14. 2026-10-20 Fix available: Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux BaseOS (v. 9) +10 · Red Hat

References

Advisory 10

Other 6

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences