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German government CERT advisories report multiple vulnerabilities in NGINX and NGINX Plus that can be exploited for denial of service, with a newer notice warning that affected NGINX Open Source and NGINX Plus deployments may also face potential code execution. The advisories indicate that the issues affect both the commercial and open source product lines, expanding the risk beyond service disruption alone.
The earlier advisory described multiple flaws enabling service outages in NGINX and NGINX Plus, while the later advisory escalated the impact to include possible remote code execution in addition to denial of service. Organizations running internet-facing NGINX infrastructure should review the referenced dCERT notices, identify exposed versions across reverse proxies, load balancers, and web servers, and prioritize vendor-recommended updates or mitigations.
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dCERT published advisory 2026-1632 for NGINX Open Source and NGINX Plus describing a vulnerability that could allow denial of service and potentially code execution. The reference indicates this as a distinct later advisory affecting the same product family.
dCERT issued advisory 2024-1711 covering multiple vulnerabilities in NGINX and NGINX Plus that could allow denial of service. No further technical details are provided in the reference content.
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F5 disclosed multiple high-severity vulnerabilities affecting **NGINX Open Source**, **NGINX Plus**, and related products, including a critical heap-based buffer overflow in `ngx_http_proxy_v2_module` and `ngx_http_grpc_module` tracked as **CVE-2026-42055**. The flaw can be triggered remotely without authentication when HTTP/2 proxying or `grpc_pass` is enabled, `ignore_invalid_headers` is set to `off`, and `large_client_header_buffers` exceeds 2 MB, allowing oversized headers to crash worker processes and potentially enable code execution if ASLR is bypassed. F5 also disclosed **CVE-2026-42530**, a critical use-after-free in the open-source `ngx_http_v3_module` that can be exploited through a crafted HTTP/3 QUIC session to reopen a QPACK encoder stream, again causing worker restarts and possible code execution. A separate issue, **CVE-2026-11311**, affects **NGINX Gateway Fabric** when **NGINX Plus** is used as the data plane, allowing authenticated users with permission to modify relevant CRDs to inject arbitrary NGINX directives through unsanitized values in `NginxProxy.serverTokens` and `AuthenticationFilter.extraAuthArgs`. F5's out-of-band advisory said the exposure spans a broad set of products, including **NGINX Ingress Controller**, **NGINX Instance Manager**, **NGINX App Protect WAF**, **NGINX App Protect DoS**, **F5 WAF for NGINX Instance Manager**, and **F5 DoS for NGINX**. Updated releases, including **nginx 1.31.2** and the stable branch **1.30.3**, were published to address the core NGINX flaws, and defenders were urged to patch affected versions or disable HTTP/3 QUIC where immediate updates are not possible.
Jun 29, 2026
F5 and NGINX disclosed **CVE-2026-42945** ("**NGINX Rift**"), a critical heap buffer overflow in `ngx_http_rewrite_module` affecting **NGINX Open Source 0.6.27 through 1.30.0** and **NGINX Plus R32 through R36**. The bug is exposed when servers use a specific rewrite pattern: a `rewrite` directive with unnamed PCRE captures such as `$1` or `$2`, a replacement string containing `?`, and a following `rewrite`, `if`, or `set` directive. An unauthenticated attacker can send crafted HTTP requests to corrupt heap memory in the worker process, reliably causing crashes and restarts; code execution is considered possible in weaker environments, particularly where **ASLR is disabled**. Fixes were released in **NGINX 1.30.1**, **1.31.0**, and patched NGINX Plus builds, while Debian, AlmaLinux, and other downstream vendors began shipping updates. Public writeups and proof-of-concept code quickly drove attacker interest, and multiple reports said **VulnCheck observed exploitation attempts on canary systems** within days of disclosure. Researchers and defenders broadly agreed that denial-of-service is the most practical near-term impact, while widespread reliable RCE is less likely on hardened systems with modern memory protections enabled. Administrators were urged to patch internet-facing reverse proxies, load balancers, ingress controllers, and API gateways, audit rewrite rules for unnamed captures, and use named captures as a temporary mitigation where upgrades cannot be applied immediately. The same release cycle also addressed additional NGINX flaws including **CVE-2026-42946**, **CVE-2026-40701**, and **CVE-2026-42934**.
Jun 29, 2026
Researchers disclosed **CVE-2026-27654**, a heap buffer overflow in NGINX's `ngx_http_dav_copy_move_handler()` that affects deployments compiled with `ngx_http_dav_module` and configured with `alias` alongside WebDAV `COPY` or `MOVE` methods. The bug stems from an unsigned underflow in `ngx_http_map_uri_to_path()` when a `Destination` header is shorter than the location prefix, allowing WebDAV root escape and arbitrary file read or write within the worker process's filesystem permissions. Calif.io said it developed multiple proof-of-concept exploits with AI assistance, including variants that could copy sensitive files such as `/etc/passwd` into attacker-accessible locations and write files through `PUT` and `COPY`, while noting that human researchers were needed to turn the initial AI-generated crash into a practical exploit chain. F5 and the NGINX security team were notified in March and released a fix in **NGINX 1.29.7** with advisory `K000160382`, while Calif later published PoC materials on GitHub describing the work as AI-generated and human-verified. Separately, Nebula Security reported a distinct NGINX zero-day dubbed **nginx-poolslip**, describing remote code execution in dynamic variable parsing paths affecting **NGINX 1.31.0** and claiming its autonomous AI agent discovered the flaw; the report said technical details were initially withheld during disclosure and that **NGINX 1.31.1** was later released as the patch. Together, the disclosures underscore a rapid cycle in which AI-assisted research is producing crash reproduction, exploit development, and fresh vulnerability claims against widely deployed NGINX code.
Jun 29, 2026