{"answers":{"affected":"7 open source packages ship an affected version, including wasmtime. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-27204 in the wild and no public exploit code.","fix":"Upgrade wasmtime to a fixed version for your release line: 24.0.6, 36.0.6, 40.0.4 or 41.0.4.","what":"CVE-2026-27204 is a medium-severity denial of service vulnerability in bytecodealliance wasmtime, published on 24 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-27204 and fix it if it is affected.\n\nWhat it is: CVE-2026-27204 is a medium-severity denial of service vulnerability in bytecodealliance wasmtime, published on 24 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-27204 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- wasmtime (crates.io): affected all versions; fixed in 24.0.6\n- wasmtime (crates.io): affected all versions; fixed in 24.0.6\n- wasmtime (crates.io): affected from 0.0.0-0; fixed in 24.0.6, 36.0.6, 40.0.4, 41.0.4\n- wasmtime (crates.io): affected from 25.0.0; fixed in 36.0.6\n- wasmtime (crates.io): affected from 25.0.0; fixed in 36.0.6\n- wasmtime (crates.io): affected from 37.0.0; fixed in 40.0.4\n- wasmtime (crates.io): affected from 37.0.0; fixed in 40.0.4\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-27204/ (Markdown: https://insights.sbomify.com/CVE-2026-27204/index.md)","id":"CVE-2026-27204","markdown":"https://insights.sbomify.com/CVE-2026-27204/index.md","name":"CVE-2026-27204","record":{"aliases":["DEBIAN-CVE-2026-27204","GHSA-852m-cvvp-9p4w","JLSEC-2026-1352","RUSTSEC-2026-0020","UBUNTU-CVE-2026-27204"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"WebAssembly runtime","requires_auth":"low_privilege","summary":"A malicious WebAssembly guest can exhaust host resources in Wasmtime, causing denial of service; embedders must upgrade and configure limits.","user_interaction":"required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"wasmtime","vendor":"bytecodealliance"}],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0"},"cwes":[{"id":"CWE-789","name":"Memory Allocation with Excessive Size Value"},{"id":"CWE-774","name":"Allocation of File Descriptors or Handles Without Limits or Throttling"},{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of WASI host interfaces are susceptible to guest-controlled resource exhaustion on the host. Wasmtime did not appropriately place limits on resource allocations requested by the guests. This serves as a Denial of Service vector. Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 have all been released with the fix for this issue. These versions do not prevent this issue in their default configuration to avoid breaking preexisting behaviors. All versions of Wasmtime have appropriate knobs to prevent this behavior, and Wasmtime 42.0.0-and-later will have these knobs tuned by default to prevent this issue from happening. There are no known workarounds for this issue without upgrading. Embedders are recommended to upgrade and configure their embeddings as necessary to prevent possibly-malicious guests from triggering this issue.","ecosystems":["crates.io"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Wasmtime WASI implementations are vulnerable to guest-controlled resource exhaustion","id":"CVE-2026-27204","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"crates.io","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":7,"n_references":7,"next":{"headline":"Flask session does not add `Vary: Cookie` header when accessed in some ways","id":"CVE-2026-27205"},"packages":[{"ecosystem":"crates.io","fixed":["24.0.6"],"introduced":["0"],"last_affected":[],"package":"wasmtime","purl":null,"source":"GHSA-852m-cvvp-9p4w"},{"ecosystem":"crates.io","fixed":["24.0.6"],"introduced":["0"],"last_affected":[],"package":"wasmtime","purl":"pkg:cargo/wasmtime","source":"GHSA-852m-cvvp-9p4w"},{"ecosystem":"crates.io","fixed":["24.0.6","36.0.6","40.0.4","41.0.4"],"introduced":["0.0.0-0","25.0.0","37.0.0","41.0.0"],"last_affected":[],"package":"wasmtime","purl":"pkg:cargo/wasmtime","source":"RUSTSEC-2026-0020"},{"ecosystem":"crates.io","fixed":["36.0.6"],"introduced":["25.0.0"],"last_affected":[],"package":"wasmtime","purl":null,"source":"GHSA-852m-cvvp-9p4w"},{"ecosystem":"crates.io","fixed":["36.0.6"],"introduced":["25.0.0"],"last_affected":[],"package":"wasmtime","purl":"pkg:cargo/wasmtime","source":"GHSA-852m-cvvp-9p4w"},{"ecosystem":"crates.io","fixed":["40.0.4"],"introduced":["37.0.0"],"last_affected":[],"package":"wasmtime","purl":null,"source":"GHSA-852m-cvvp-9p4w"},{"ecosystem":"crates.io","fixed":["40.0.4"],"introduced":["37.0.0"],"last_affected":[],"package":"wasmtime","purl":"pkg:cargo/wasmtime","source":"GHSA-852m-cvvp-9p4w"}],"prev":{"headline":"eBay API MCP Server Affected by Environment Variable Injection","id":"CVE-2026-27203"},"products":["wasmtime"],"published":"2026-02-24","related":[{"cvss_score":9,"headline":"Wasmtime miscompiled guest heap access enables sandbox escape on aarch64 Cranelift","id":"CVE-2026-34971","kev_date_added":null,"published":"2026-04-09"},{"cvss_score":9,"headline":"Wasmtime with Winch compiler backend on aarch64 may allow a sandbox-escaping memory access","id":"CVE-2026-34987","kev_date_added":null,"published":"2026-04-09"},{"cvss_score":8.6,"headline":"Wasmtime vulnerable to data leakage between instances in the pooling allocator","id":"CVE-2022-39393","kev_date_added":null,"published":"2022-11-10"},{"cvss_score":8.1,"headline":"Use after free in Wasmtime","id":"CVE-2022-24791","kev_date_added":null,"published":"2022-03-31"},{"cvss_score":7.5,"headline":"Wasmtime: WASI path_open(TRUNCATE) bypasses `FilePerms::WRITE` host restriction","id":"CVE-2026-47261","kev_date_added":null,"published":"2026-06-15"},{"cvss_score":6.9,"headline":"Wasmtime has a Heap OOB read in component model UTF-16 to latin1+utf16 string transcoding","id":"CVE-2026-34941","kev_date_added":null,"published":"2026-04-09"},{"cvss_score":6.9,"headline":"Wasmtime is vulnerable to panic when dropping a `[Typed]Func::call_async` future","id":"CVE-2026-27195","kev_date_added":null,"published":"2026-02-24"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"open","licence":"CC0 1.0","name":"RustSec","prefix":"RUSTSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-02-27","vendors":["bytecodealliance"]},"summary":"A malicious WebAssembly guest can exhaust host resources in Wasmtime, causing denial of service; embedders must upgrade and configure limits.","url":"https://insights.sbomify.com/CVE-2026-27204/"}