NGINX Plus: Use of Uninitialized Resource
CVE-2026-60005 is a high-severity use of uninitialized resource vulnerability in NGINX Plus from F5, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 37.0.3.1, R36 P7 as the first without the flaw, so updating NGINX Plus to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.74% chance of exploitation within 30 days, higher than 55% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update NGINX Plus to 37.0.3.1 or R36 P7, whichever matches your release line, or a later version.
- Update NGINX Open Source to 1.31.3 or 1.30.4, whichever matches your release line, or a later version.
- Update Nginx Gateway Fabric to 2.6.7 or a later version.
- Read the advisory on my.f5.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| F5 | NGINX Plus | 37.0.0.1 up to, but not including, 37.0.3.1; R36 up to, but not including, R36 P7; R33 and later | 37.0.3.1, R36 P7 |
| F5 | NGINX Open Source | 1.31.2 up to, but not including, 1.31.3; 1.15.8 up to, but not including, 1.30.4 | 1.31.3, 1.30.4 |
| F5 | Nginx Gateway Fabric | 1.3.0 through 1.6.2; 2.0.0 up to, but not including, 2.6.7 | 2.6.7 |
| F5 | Nginx Ingress Controller | 3.5.0 through 3.7.2; 5.0.0 up to, but not including, 5.5.3; 2026-lts-r1 up to, but not including, 2026-lts-r4; 4.0.0; 4.0.1 | 5.5.3, 2026-lts-r4 |
| F5 | Nginx Instance Manager | 2.17.0 up to, but not including, 2.22.2 | 2.22.2 |
| F5 | Waf | 4.11.0 through 4.16.0; 5.2.0 through 5.8.0; 5.9.0 up to, but not including, 5.13.4 | 5.13.4 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- LowSome restricted data can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H. Scored by CNA (f5.com).
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.8 | High | CNA (f5.com) |
| CVSS 3.1 | 8.2 | High | CNA (f5.com) |
Official description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_slice_module module. When the slice directive and unnamed regex captures are configured or when a background cache update happens, unauthenticated attackers can send requests that may cause uninitialized memory access in the NGINX worker process, leading to limited disclosure of memory or a restart. Impact: This vulnerability may allow remote, unauthenticated attackers to have limited control to disclose memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only. Note: The ngx_http_slice_module module is not enabled by default; it's enabled with the --with-http_slice_module configuration parameter. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Use of Uninitialized Resource
The product uses or accesses a resource that has not been initialized.
How developers prevent this class of flaw
- Explicitly initialize the resource before use. If this is performed through an API function or standard procedure, follow all required steps.
- Pay close attention to complex conditionals that affect initialization, since some branches might not perform the initialization.
- Avoid race conditions (CWE-362) during initialization routines.
More Use of Uninitialized Resource vulnerabilities (CWE-908)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in NGINX Plus
- 8.1 High severity
- 8.1 High severity
- 8.1 High severity
- 8.1 High severity
- 8.1 High severity
- 8.1 High severity
Recent Use of Uninitialized Resource vulnerabilities
- 9.1 Critical severity
- 8.8 High severity
- 9.8 Critical severity
- 7.5 High severity
- 7.8 High severity
- 7.5 High severity
Spotted an error? Tell us.