8.8

CVE-2026-87766: bubblewrap Link Following

CVSS: 8.8v3.1HighAwaiting analysis
AliasesMGASA-2026-0371UBUNTU-CVE-2026-87766DEBIAN-CVE-2026-87766
Published 09-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-87766 is a high (CVSS 8.8) Link Following vulnerability in bubblewrap. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.6% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
OPENSUSE-SU-2026:11873-1USN-8779-1

Timeline

  1. 09-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

+0.03 pp

From 0.14% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat3 products
  • bubblewrap< 0:0.4.0-3.el8_10 | < 0:0.10.0-5.el10_2 | < 0:0.6.3-1.el9_8.1 | < 0:0.10.0-3.el10_0.4 | < 0:0.4.0-3.el8_8 | < 0:0.4.0-3.el8_4 | < 0:0.4.1-7.el9_4.1 | < 0:0.4.1-7.el9_2.1 | < 0:0.4.0-3.el8_6 | < 0:0.4.1-8.el9_6.1
  • bubblewrap-debuginfo< 0:0.4.0-3.el8_10 | < 0:0.10.0-5.el10_2 | < 0:0.6.3-1.el9_8.1 | < 0:0.10.0-3.el10_0.4 | < 0:0.4.0-3.el8_8 | < 0:0.4.0-3.el8_4 | < 0:0.4.1-7.el9_4.1 | < 0:0.4.1-7.el9_2.1 | < 0:0.4.0-3.el8_6 | < 0:0.4.1-8.el9_6.1
  • bubblewrap-debugsource< 0:0.4.0-3.el8_10 | < 0:0.10.0-5.el10_2 | < 0:0.6.3-1.el9_8.1 | < 0:0.10.0-3.el10_0.4 | < 0:0.4.0-3.el8_8 | < 0:0.4.0-3.el8_4 | < 0:0.4.1-7.el9_4.1 | < 0:0.4.1-7.el9_2.1 | < 0:0.4.0-3.el8_6 | < 0:0.4.1-8.el9_6.1
Debian1 product
  • bubblewrapAll versions (No fix recorded) | < 0.12.0-1~deb13u1 | < 0.12.0-1
Mageia1 product
  • bubblewrap< 0.12.0-1.mga10
Ubuntu1 product
  • bubblewrapAll versions (No fix recorded)

4 vendors · 6 products

References

36 links
Show all 36 references