CVE-2026-48142
NGINX ngx_http_charset_module vulnerability
CVSS Score
4.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-125 |
| Vendor | f5 |
| Product | nginx open source |
| Published | Jun 17, 2026 |
| Last Updated | Jun 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low
Affected Versions
F5 / NGINX Open Source
1.13.10 < 1.31.2 1.30.0 < 1.30.3
F5 / NGINX Plus
37.0 < 37.0.2.1 R36 < R36 P6
Credits
🔍 "F5 acknowledges p4p3r of CYBERONE and Han Yan of Xiaomi for bringing this issue to our attention and following the highest standards of coordinated disclosure."