{"answers":{"affected":"1 open source package ship an affected version, including wasmtime.","exploited":"There is no known exploitation of CVE-2026-115391 in the wild and no public exploit code.","fix":"Upgrade wasmtime to a fixed version for your release line: 46.0.3 or 47.0.4.","what":"CVE-2026-115391 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 22 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-115391 and fix it if it is affected.\n\nWhat it is: CVE-2026-115391 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 22 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-115391 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- wasmtime (crates.io): affected from 46.0.0; fixed in 46.0.3, 47.0.4\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-2026-115391/ (Markdown: https://insights.sbomify.com/CVE-2026-115391/index.md)","id":"CVE-2026-115391","markdown":"https://insights.sbomify.com/CVE-2026-115391/index.md","name":"CVE-2026-115391","record":{"aliases":["GHSA-6862-f859-6m9r","GHSA-x84v-gj2h-g759","RUSTSEC-2026-0268","UBUNTU-CVE-2026-115391"],"analysis":null,"analysis_generated_by":null,"assigner":"VulnCheck","cpe":[],"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-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers guest-specified-length writes on the host without limit. Malicious guests can offer large buffers to WASIp3 file or HTTP write streams, causing the host to copy and buffer all bytes, bounded only by guest linear memory, exhausting host memory.","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 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 Unbounded Heap Allocation via WASIp3 Streams","id":"CVE-2026-115391","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"crates.io","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":2,"next":{"headline":"Wasmtime before 24.0.13, 25.0.0 before 36.0.14, 37.0.0 before 46.0.3, and 47.0.0 before 47.0.4 allows a filesystem sandbox escape in wasmtim","id":"CVE-2026-115392"},"packages":[{"ecosystem":"crates.io","fixed":["46.0.3","47.0.4"],"introduced":["46.0.0","47.0.0"],"last_affected":[],"package":"wasmtime","purl":"pkg:cargo/wasmtime","source":"RUSTSEC-2026-0268"}],"prev":{"headline":"Wasmtime 47.0.0 before 48.0.3 and 49.0.0 before 49.0.1 Fuel Accounting Bypass DoS","id":"CVE-2026-115390"},"products":["wasmtime"],"published":"2026-10-22","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"open","licence":"CC0 1.0","name":"RustSec","prefix":"RUSTSEC"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-22","vendors":["bytecodealliance"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-115391/"}