CVE-2026-48142 Details
Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When content is served or proxied through a location block with both source_charset utf-8; and a charset directive (for example, charset koi8-r;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their control) to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
A heap buffer over-read vulnerability has been identified in the ngx_http_charset_module of NGINX Plus and NGINX Open Source. This issue arises when content is served or proxied through a location block that has both source_charset set to utf-8 and a charset directive, such as charset koi8-r, configured. Under these conditions, remote, unauthenticated attackers can send requests that exploit this vulnerability, leading to a limited disclosure of memory contents or causing a restart of the NGINX worker process.
Users can upgrade to NGINX Plus version 37.0.2.1 or NGINX Open Source versions 1.31.2 or 1.30.3 to address this vulnerability. For NGINX Instance Manager, versions 2.6.4 or 2.22.0 should be installed. If using NGINX App Protect WAF, upgrade to version 5.8.0 or 4.16.0. For NGINX Gateway Fabric, version 2.6.4 should be used.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 17, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://my.f5.com/manage/s/article/K000161585 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| f5 dos | >= 4.3.0, <= 4.7.0 4.9.0 |
CPE
Remediation
| |
| f5 nginx gateway fabric | >= 1.3.0, <= 1.6.2 >= 2.0.0, <= 2.6.3 |
CPE
Remediation
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| f5 nginx ingress controller | >= 3.5.0, <= 3.7.2 >= 4.0.0, <= 4.0.1 >= 5.0.0, <= 5.5.0 |
CPE
Remediation
| |
| f5 nginx instance manager | >= 2.17.0, <= 2.22.0 |
CPE
Remediation
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| f5 nginx open source | >= 1.0.0, <= 1.30.2 >= 1.31.0, <= 1.31.1 |
CPE
Remediation
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| f5 nginx plus | >= 37.0.0.1, < 37.0.2.1 >= r33, < r36 r36 - r36 p1 r36 p2 r36 p3 r36 p4 r36 p5 |
CPE
Remediation
| |
| f5 waf | >= 4.10.0, <= 4.16.0 >= 5.2.0, <= 5.8.0 >= 5.9.0, <= 5.13.1 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 11, 2026 | Reanalysis | [email protected] |
| Jun 22, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | New CVE Received | [email protected] |