CVE-2026-48142
CVE-2026-48142 is a medium-severity vulnerability in F5 Dos with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: Medium (CVSS 3.x base score 4.8)
- CVSS v4: 6.3
- EPSS exploit prediction: 0% (32nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-37719
- Weakness: CWE-125
- Affected product: F5 Dos
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-48142?
- 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.
- How severe is CVE-2026-48142?
- CVE-2026-48142 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.
- Is CVE-2026-48142 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-48142?
- CVE-2026-48142 primarily affects F5 Dos. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-48142?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-48142 have an EU (EUVD) identifier?
- Yes. CVE-2026-48142 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37719.
- When was CVE-2026-48142 published?
- CVE-2026-48142 was published on 2026-06-17 and last updated on 2026-06-22.
References
Affected products (8)
- cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*
- cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*
- cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*
More vulnerabilities in F5 Dos
- CVE-2026-42055 — High (CVSS 8.1): NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and…
- CVE-2026-42945 — High (CVSS 8.1): NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists…
- CVE-2026-42946 — Medium (CVSS 6.5): A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive…
- CVE-2026-40460 — Medium (CVSS 6.5): When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof…
- CVE-2026-42934 — Medium (CVSS 4.8): NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset,…
- CVE-2026-40701 — Medium (CVSS 4.8): NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssl_module module when the…
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