CVE-2026-54369

HighPublic PoC

Published: 29 June 2026

Published

29 June 2026

Modified

02 July 2026

KEV Added

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Patch

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CVSS Score v4 8.4 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0014 3.9th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-54369 is a high-severity Link Following (CWE-59) vulnerability in Nongnu (inferred from references). Its CVSS base score is 8.4 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 3.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-40085

Vulnerability details

acl before version 2.4.0 contains a symlink traversal vulnerability in the libacl pathname-based functions acl_get_file(), acl_set_file(), acl_extended_file(), and acl_delete_def_file() that allows local attackers to escalate privileges by replacing any pathname component with a symbolic link. Attackers who control any component…

of a pathname processed by a privileged caller can redirect ACL read or write operations to arbitrary files or directories, enabling unauthorized manipulation of access control lists and local privilege escalation.

CWE(s): CWE-59

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

T1222.002 Linux and Mac Permissions Defense Impairment

Adversaries may modify file or directory permissions/attributes to evade access control lists (ACLs) and access protected files.

attack.mitre.org →

Why these techniques?

Symlink traversal in libacl enables local attackers to redirect ACL operations for unauthorized permission changes (T1222.002) leading to privilege escalation (T1068).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0