Vulnerability · Published Mar 13, 2026 · Assigned by redhat

CVE-2025-57849Fuse: privilege escalation via excessive /etc/passwd permissions

Medium 6.4

In plain English

A medium-severity incorrect default permissions in Red Hat Fuse 7 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)6.4Medium

Exploit odds (30 days)0.2%top 87.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A container privilege escalation flaw was found in certain Fuse images. This issue stems from the /etc/passwd file being created with group-writable permissions during build time. In certain conditions, an attacker who can execute commands within an affected container, even as a non-root user, can leverage their membership in the root group to modify the /etc/passwd file. This could allow the attacker to add a new user with any arbitrary UID, including UID 0, leading to full root privileges within the container.

Affected products (as reported)

Vendor	Product	Versions
Red Hat	Red Hat Fuse 7	see references
Red Hat	Red Hat Fuse 7	see references
Red Hat	Red Hat Fuse 7	see references
Red Hat	Red Hat Fuse 7	see references
Red Hat	Red Hat Fuse 7	see references
Red Hat	Red Hat Fuse 7	see references

Weakness: CWE-276 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

References

https://access.redhat.com/security/cve/CVE-2025-57849 vdb-entry, x_refsource_REDHAT
RHBZ#2391100 issue-tracking, x_refsource_REDHAT