CVE-2026-88265: crun Link Following
CVSS: 5.6v3.1MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-88265DEBIAN-CVE-2026-88265
Published 10-09-2026Last modified 02-10-2026
Vulnerability summary
CVE-2026-88265 is a medium (CVSS 5.6) Link Following vulnerability in crun. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.7% of scored vulnerabilities.
CVSS score
5.6/10
010
Medium · v3.1 (CVE.org)EPSS score
0.12%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 10-09-2026PublishedVulnerability first disclosed.
- 02-10-2026Last modifiedVulnerability information updated.
Description
A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 5.6Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated5.6MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated5.6MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
- NVDNIST5.6MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
EPSS trend
Probability
0.12%
Chance of exploitation in the next 30 days
Percentile
2%
Versus all other CVEs
30-day change
0.00 pp
From 0.12% on 20-09-2026
20-09-202620-10-2026
EPSS score0.12%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- crunAll versions (No fix recorded)
Ubuntu1 product
- crunAll versions (No fix recorded)
2 vendors · 2 products
