# wasmtime-wasi-http (crates.io) vulnerabilities Source: https://junglewise.ai/threats/technologies/wasmtime-wasi-http Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/wasmtime-wasi-http.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 8 vulnerabilities in wasmtime-wasi-http (crates.io): 0 in the last 7 days and 8 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, RUSTSEC-2026-0421 - wasi-http p2: outgoing content-length can be invalid or…, was published on 29 October 2026. 6 vulnerabilities in the last four weeks, up 200% on the four before (2). ## Counts - Last 7 days: 0 - Last 30 days: 6 - Last 90 days: 8 - All time: 8 (0 critical, 0 exploited in the wild) ## About wasmtime-wasi-http (crates.io) WebAssembly runtime module implementing WASI HTTP interface for making HTTP requests from WASM programs. ## Latest wasmtime-wasi-http (crates.io) vulnerabilities - [RUSTSEC-2026-0421 - wasi-http p2: outgoing content-length can be invalid or not match body](https://junglewise.ai/threats/rustsec-2026-0421-wasi-http-p2-outgoing-content-length-can-be-invalid-0d34a0cb) (low, CVSS 3.1, published 29 Oct 2026) - [RUSTSEC-2026-0375 - `wasi-http` p3: Guests can set incorrect content-length for spliced response bodies](https://junglewise.ai/threats/rustsec-2026-0375-wasi-http-p3-guests-can-set-incorrect-content-length-2c05e20d) (low, CVSS 3.1, published 19 Oct 2026) - [RUSTSEC-2026-0377 - `wasi-http` p3: forwarded trailers aren't checked against `is_forbidden_header` hook](https://junglewise.ai/threats/rustsec-2026-0377-wasi-http-p3-forwarded-trailers-aren-t-checked-9789d51f) (low, CVSS 3.1, published 19 Oct 2026) - [RUSTSEC-2026-0376 - `wasi-http`: Guests can add conflicting content lengths to messages](https://junglewise.ai/threats/rustsec-2026-0376-wasi-http-guests-can-add-conflicting-content-lengths-ab318814) (low, CVSS 3.1, published 19 Oct 2026) - [RUSTSEC-2026-0351 - `wasi-http`: Request with long url before query parameter crashes host](https://junglewise.ai/threats/rustsec-2026-0351-wasi-http-request-with-long-url-before-query-5b91b430) (low, CVSS 3.1, published 14 Oct 2026) - [Wasmtime WASI HTTP absolute-form request redirect](https://junglewise.ai/threats/rustsec-2026-0350-guests-can-send-absolute-form-http-requests-to-c9af59e3) (medium, CVSS 4, published 14 Oct 2026) - [Wasmtime wasi:http implementation panic with zero timeout](https://junglewise.ai/threats/rustsec-2026-0320-wasmtime-wasi-http-implementation-panics-with-a-zero-849ad606) (medium, CVSS 4, published 2 Oct 2026) - [RUSTSEC-2026-0313 - Outgoing HTTP body write allows guest-driven host memory exhaustion](https://junglewise.ai/threats/rustsec-2026-0313-outgoing-http-body-write-allows-guest-driven-host-c0081240) (low, CVSS 3.1, published 24 Sep 2026) ## Most severe wasmtime-wasi-http (crates.io) vulnerabilities - [Wasmtime WASI HTTP absolute-form request redirect](https://junglewise.ai/threats/rustsec-2026-0350-guests-can-send-absolute-form-http-requests-to-c9af59e3) (medium, CVSS 4, published 14 Oct 2026) - [Wasmtime wasi:http implementation panic with zero timeout](https://junglewise.ai/threats/rustsec-2026-0320-wasmtime-wasi-http-implementation-panics-with-a-zero-849ad606) (medium, CVSS 4, published 2 Oct 2026) - [RUSTSEC-2026-0421 - wasi-http p2: outgoing content-length can be invalid or not match body](https://junglewise.ai/threats/rustsec-2026-0421-wasi-http-p2-outgoing-content-length-can-be-invalid-0d34a0cb) (low, CVSS 3.1, published 29 Oct 2026) - [RUSTSEC-2026-0377 - `wasi-http` p3: forwarded trailers aren't checked against `is_forbidden_header` hook](https://junglewise.ai/threats/rustsec-2026-0377-wasi-http-p3-forwarded-trailers-aren-t-checked-9789d51f) (low, CVSS 3.1, published 19 Oct 2026) - [RUSTSEC-2026-0376 - `wasi-http`: Guests can add conflicting content lengths to messages](https://junglewise.ai/threats/rustsec-2026-0376-wasi-http-guests-can-add-conflicting-content-lengths-ab318814) (low, CVSS 3.1, published 19 Oct 2026) - [RUSTSEC-2026-0375 - `wasi-http` p3: Guests can set incorrect content-length for spliced response bodies](https://junglewise.ai/threats/rustsec-2026-0375-wasi-http-p3-guests-can-set-incorrect-content-length-2c05e20d) (low, CVSS 3.1, published 19 Oct 2026) - [RUSTSEC-2026-0351 - `wasi-http`: Request with long url before query parameter crashes host](https://junglewise.ai/threats/rustsec-2026-0351-wasi-http-request-with-long-url-before-query-5b91b430) (low, CVSS 3.1, published 14 Oct 2026) - [RUSTSEC-2026-0313 - Outgoing HTTP body write allows guest-driven host memory exhaustion](https://junglewise.ai/threats/rustsec-2026-0313-outgoing-http-body-write-allows-guest-driven-host-c0081240) (low, CVSS 3.1, published 24 Sep 2026) ## Vulnerabilities per week 6 vulnerabilities in the last four weeks, up 200% on the four before (2). | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 1 | 0 | 0 | | 28 Sep 2026 | 1 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 2 | 0 | 0 | | 19 Oct 2026 | 3 | 0 | 0 | | 26 Oct 2026 | 1 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other crates.io technologies - [surrealdb (crates.io)](https://junglewise.ai/threats/technologies/surrealdb): 83 vulnerabilities - [wasmtime (crates.io)](https://junglewise.ai/threats/technologies/wasmtime): 67 vulnerabilities - [deno (crates.io)](https://junglewise.ai/threats/technologies/deno): 39 vulnerabilities - [zebrad (crates.io)](https://junglewise.ai/threats/technologies/zebrad): 27 vulnerabilities - [russh (crates.io)](https://junglewise.ai/threats/technologies/crates-io-russh): 26 vulnerabilities - [openssl-src (crates.io)](https://junglewise.ai/threats/technologies/openssl-src): 26 vulnerabilities - [openssl (crates.io)](https://junglewise.ai/threats/technologies/crates-io-openssl): 25 vulnerabilities - [rustfs (crates.io)](https://junglewise.ai/threats/technologies/rustfs): 25 vulnerabilities - [coreutils (crates.io)](https://junglewise.ai/threats/technologies/crates-io-coreutils): 21 vulnerabilities - [ckb (crates.io)](https://junglewise.ai/threats/technologies/ckb): 19 vulnerabilities - [apollo-router (crates.io)](https://junglewise.ai/threats/technologies/apollo-router): 13 vulnerabilities - [deepseek-tui (crates.io)](https://junglewise.ai/threats/technologies/deepseek-tui): 13 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "wasmtime-wasi-http (crates.io) vulnerabilities", https://junglewise.ai/threats/technologies/wasmtime-wasi-http, 9 November 2026.