{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8257 exists.","fix":"Apply the vendor's patch.","what":"CVE-2026-8257 is a medium-severity denial of service vulnerability in WebAssembly Binaryen, published on 11 May 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-8257 and fix it if it is affected.\n\nWhat it is: CVE-2026-8257 is a medium-severity denial of service vulnerability in WebAssembly Binaryen, published on 11 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8257 exists.\n\nAffected product: WebAssembly Binaryen. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-8257/ (Markdown: https://insights.sbomify.com/CVE-2026-8257/index.md)","id":"CVE-2026-8257","markdown":"https://insights.sbomify.com/CVE-2026-8257/index.md","name":"CVE-2026-8257","record":{"aliases":["DEBIAN-CVE-2026-8257","GHSA-gmmj-chcc-2f2x","JLSEC-2026-1094","UBUNTU-CVE-2026-8257"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"WebAssembly Binaryen library","requires_auth":"low_privilege","summary":"A local attacker can trigger a reachable assertion in the BrOn parser, causing a denial of service in WebAssembly Binaryen.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulDB","cpe":[{"product":"binaryen","vendor":"webassembly"}],"cvss":{"score":4.8,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-617","name":"Reachable Assertion"}],"description":"A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of the component BrOn Parser. Performing a manipulation results in reachable assertion. The attack needs to be approached locally. The exploit is now public and may be used. The patch is named 1251efbc1ea471c1311d2726b2bbe061ff2a291c. It is suggested to install a patch to address this issue.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion","id":"CVE-2026-8257","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":8,"next":{"headline":"Squirrel sqstdstring.cpp validate_format stack-based overflow","id":"CVE-2026-8258"},"packages":[],"prev":{"headline":"Devs Palace ERP Online mr-save cross site scripting","id":"CVE-2026-8256"},"products":["Binaryen"],"published":"2026-05-11","related":[{"cvss_score":6.5,"headline":"Null dereference in n/a","id":"CVE-2020-18378","kev_date_added":null,"published":"2023-08-22"},{"cvss_score":6.5,"headline":"Memory corruption in n/a","id":"CVE-2020-18382","kev_date_added":null,"published":"2023-08-22"},{"cvss_score":6.5,"headline":"Denial of service in n/a","id":"CVE-2019-15758","kev_date_added":null,"published":"2019-08-29"},{"cvss_score":6.5,"headline":"Null dereference in n/a","id":"CVE-2019-15759","kev_date_added":null,"published":"2019-08-29"},{"cvss_score":6.5,"headline":"Memory corruption in n/a","id":"CVE-2019-7700","kev_date_added":null,"published":"2019-02-10"},{"cvss_score":6.5,"headline":"Memory corruption in n/a","id":"CVE-2019-7701","kev_date_added":null,"published":"2019-02-10"},{"cvss_score":6.5,"headline":"Null dereference in n/a","id":"CVE-2019-7702","kev_date_added":null,"published":"2019-02-10"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-11","vendors":["WebAssembly"]},"summary":"A local attacker can trigger a reachable assertion in the BrOn parser, causing a denial of service in WebAssembly Binaryen.","url":"https://insights.sbomify.com/CVE-2026-8257/"}