5.3
MediumCVSS 3.1 · from VulnCheck
CVE-2026-119141
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via realloc
wasmtime · CWE-1265 · CWE-1265Affectedwasmtime
FixUpdate to 48.0.6, 49.0.3 or newer
PublishedOct 29, 15:58 · VulnCheck
ScoredOct 29 · 5.3 · VulnCheck
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:04 UTC
What we know
No known exploitation. CISA KEV, checked 22:04 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.
Description
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious Wasm modules to panic the host because the may_leave flag is not cleared during realloc. Attackers can call into the host from realloc while lowering stream or future results, such as cancelling the active read or re-waiting a waitable-set, crashing the host.
From VulnCheck
Affected and fixed versions
ProductAffectedFixed inwasmtime46.0.0 – before 48.0.648.0.6wasmtimeNot affected48.0.6wasmtime49.0.0 – before 49.0.349.0.3wasmtimeNot affected49.0.3
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known