Golang gRPC – CVE-2026-33186 Detail
A vulnerability has been identified in gRPC-Go versions prior to 1.79.3, allowing for an authorization bypass due to improper input validation of the HTTP/2 `:path` pseudo-header. This flaw permits requests without a leading slash to bypass defined authorization rules, potentially exposing sensitive data. Users are advised to upgrade to version 1.79.3 or implement mitigation strategies to secure their systems.
- ▪The vulnerability affects gRPC-Go servers using path-based authorization interceptors.
- ▪Requests with a `:path` that does not start with a leading slash can bypass authorization rules.
- ▪The issue can be exploited by attackers sending malformed HTTP/2 frames directly to the server.
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Story provenance
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Record
| Original publisher | Nist |
| Canonical URL | https://nvd.nist.gov/vuln/detail/CVE-2026-33186 |
| Publication time | Thu, 21 May 2026 14:46:15 +0000 |
| Retrieval time | 2026-05-21T14:51:11.084Z |
| Last seen | 2026-05-21T14:51:11.084Z |
| 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 | cmlV-vBPFnbp |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| 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
Vulnerabilities /* wrap the words for CVSS v4 */ #nistv4Metric { word-wrap: break-word; } /* Keep very long reference URLs from expanding the table */ .hyperlink-url-cell, .hyperlink-url-cell a { overflow-wrap: anywhere; word-break: break-word; white-space: normal; } CVE-2026-33186 Detail Description gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`).
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Nist.
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