Nginx Rift
A critical heap-based buffer overflow vulnerability, CVE-2026-42945, has been discovered in NGINX software, affecting both open source and commercial versions. The flaw allows unauthenticated remote attackers to crash worker processes or execute arbitrary code via crafted HTTP requests. The vulnerability stems from a configuration-specific issue in the rewrite module involving unnamed regex captures and URI handling.
- ▪CVE-2026-42945 is a critical-severity heap-based buffer overflow in NGINX software with a CVSS v4.0 score of 9.2.
- ▪The vulnerability is triggered by a specific rewrite configuration pattern involving unnamed regex captures and a question mark in the replacement string.
- ▪It affects NGINX Open Source, NGINX Plus, and several F5 products, but not F5's cloud or BIG-IP platforms.
- ▪Remote, unauthenticated attackers can achieve remote code execution or cause denial of service via crafted HTTP requests.
- ▪Mitigation involves upgrading to patched versions or refactoring rewrite rules to use named captures instead of unnamed ones.
Hacker News (Newest) files mainly under programming. We currently carry 5,306 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
inspect →
Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Depthfirst |
| Canonical URL | https://depthfirst.com/nginx-rift |
| Publication time | Sat, 16 May 2026 10:27:42 +0000 |
| Retrieval time | 2026-05-16T10:40:18.221Z |
| Last seen | 2026-05-16T10:40:18.221Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | None |
| Cluster logic | Not yet clustered, or no peer story found in the clustering window. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
CVE-2026-42945 · Heap-based Buffer Overflow · CVSS v4.0 9.2 (Critical) found autonomously by depthfirst NGINX Rift An 18 year old memory corruption flaw in NGINX Plus and NGINX Open Source lets an unauthenticated attacker crash worker processes or execute remote code with crafted HTTP requests. Read the technical writeup $5m to Secure Open Source Software for(const t of document.querySelectorAll(".video-embed")){const e=t.querySelector("video"),o=t.querySelector(".video-embed__play");!e||!o||(o.addEventListener("click",()=>{e.controls=!0,t.classList.add("is-playing"),e.play()}),e.addEventListener("pause",()=>{t.classList.remove("is-playing")}),e.addEventListener("ended",()=>{e.controls=!1,e.currentTime=0,t.classList.remove("is-playing")}))} TL;DR A bug in the ngx_http_rewrite_module lets…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Depthfirst.
Discussion
0 commentsMore from Depthfirst
