EUVD-2026-44682
GHSA-66rh-w67w-7426
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/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
Network-reachable with low-privilege authentication required; limited confidentiality and integrity impact with no availability concern and no scope change.
Primary rating from Vendor (f5).
CVSS VectorVendor: f5
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/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
Lifecycle Timeline
2DescriptionCVE.org
The NGINX Agent config_dirs directive allows a low-privileged attacker to gain limited read and write access to files outside of the designated secure directory. The config_dirs directive required for this issue can also be configured through NGINX Instance Manager. A successful exploit may allow an attacker to cross a security boundary.
Impact: A remotely authenticated low-privileged attacker could gain limited read and write access outside of the list of directories specified in the NGINX Agent configuration.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
AnalysisAI
Path traversal in F5 NGINX Agent via the config_dirs directive enables a remotely authenticated low-privileged attacker to read and write files outside of the directories designated as secure in the agent's configuration. The config_dirs directive can be set directly in the NGINX Agent configuration or through NGINX Instance Manager, expanding the attack surface across both products. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) the attacker holds low-privileged authentication to the NGINX Agent or NGINX Instance Manager (confirmed by CVSS PR:L); (2) the config_dirs directive is configurable by the attacker's privilege level - either directly through agent configuration or via NGINX Instance Manager. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 (Medium) reflects a realistic threat profile: network-reachable (AV:N), low complexity (AC:L), no attack prerequisites (AT:N), but requiring low-privilege authentication (PR:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-privileged credentials to an NGINX Agent deployment - such as a service account or a compromised application user with agent API access - submits a crafted config_dirs value containing path traversal sequences. The agent processes the malformed directive without proper canonicalization and grants the attacker limited read/write access to files outside the configured secure directories, potentially exposing NGINX configuration files, TLS certificates, or other files accessible to the agent process. |
| Remediation | A patch is available from F5 per vendor advisory K000161971 (https://my.f5.com/manage/s/article/K000161971); the exact fixed version number was not included in the available input data and should be confirmed directly from that advisory before deploying. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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