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Fencer Vulns
critical 9.9

CVE-2026-48753 json

Incus has an arbitrary file write via path traversal in S3 multipart upload

published 2026-06-26 4 mo ago modified 2026-10-15 24 d ago also GHSA-ccjc-4qc3-jxqc , GO-2026-5802 , EUVD-2026-63980

cvss
9.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

Incus is a system container and virtual machine manager. Prior to version 7.1.0, the S3 protocol upload endpoint is vulnerable to path traversal and allows creation of arbitrary files on the host. This behavior could lead to arbitrary command execution. Version 7.1.0 fixes the issue.

Patch / fix

  • go github.com/lxc/incus/v7/cmd/incusd 7.1.0
  • go github.com/lxc/incus/v7 7.1.0
  • incus Debian 14 7.0.0-2

debian advisories DEBIAN-CVE-2026-48753

  • incus openSUSE Tumbleweed 7.4-1.1
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:11651-1openSUSE-SU-2026:21483-1

  • incus Alpine 3.24 7.0.1-r0

alpine advisories ALPINE-CVE-2026-48753

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-48753 updated cvss 9.9

incus: Incus has an arbitrary file write via path traversal in S3 multipart upload

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/lxc/incus/security/advisories/GHSA-ccjc-4qc3-jxqc referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
GitHub 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/lxc/incus/v7/cmd/incusd
<7.1.0
7.1.0
go github.com/lxc/incus
all versions
 no fix listed
go github.com/lxc/incus/v6
all versions
 no fix listed
go github.com/lxc/incus/v7
<7.1.0
7.1.0

Affected products

  • lxc incus

Classification

Weakness
  • CWE-73 External Control of File Name or Path

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.