{"id":"AZL-113143","summary":"CVE-2026-54914 affecting package fluent-bit 3.1.10-9","details":"WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. Prior to 2.4.5, wasi_poll_oneoff in core/iwasm/libraries/libc-wasi/libc_wasi_wrapper.c validates the output pointer for only one wasi_event_t, while wasmtime_ssp_poll_oneoff in core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/src/posix.c can write as many events as the guest-controlled nsubscriptions value. A crafted guest module can provide multiple subscriptions that produce events while positioning an output region large enough for only one event, causing a later out[nevents] write to cross the validated Wasm linear-memory boundary into adjacent host heap memory. The overwrite contains partly attacker-controlled event data and can reliably crash the host process, with further confidentiality or integrity consequences depending on heap layout. This issue is fixed in version 2.4.5.","modified":"2026-11-13T14:17:21.726057176Z","published":"2026-11-05T18:17:08Z","upstream":["CVE-2026-54914"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54914"}],"affected":[{"package":{"name":"fluent-bit","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/fluent-bit"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.1.10-9"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-113143.json"}}],"schema_version":"1.9.2"}