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CVE-2026-115892

Wasmtime: Panic lowering a host-created component model stream into a guest that expects a different payload type

CVSS score

5.7

EPSS probability

—

Risk score

0.6

Published

2 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

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Vulnerability description

DayBreach AI Explanation

Verified against sources

Wasmtime Component Model Stream Type Mismatch and Panic Vulnerability

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

In Wasmtime, lowering a host-created component-model stream or future into a guest expecting a different payload type can omit a required payload-type check. This causes the Wasmtime host to panic.

Why does it matter?

A malicious guest controlling exported function types or returned values can cause the host to pass a type-erased value to a guest expecting a different payload type, causing a host panic.

What should be done?

  • Upgrade Wasmtime to versions 48.0.7 or 49.0.4
  • Follow vendor advisories
Chain of evidence and sources2 verified claims

Wasmtime, 46.0.0 ile 48.0.7 ve 49.0.0 ile 49.0.4 sürümleri arasında bu güvenlik açığından etkilenmektedir.

S0 · daybreach-canonicalS1 · cvelist

Sorun 48.0.7 ve 49.0.4 sürümlerinde giderilmiştir.

S0 · daybreach-canonicalS1 · cvelist
Show the technical text from the sources

Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or an equivalent typed reader. A malicious guest that controls exported function types or returned values can cause the host to pass the type-erased value to a guest expecting a different payload type, which panics the Wasmtime host. This issue is fixed in versions 48.0.7 and 49.0.4.

CVSS vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CWE: CWE-843, CWE-248

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-115892 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1bytecodealliancewasmtime View
2crates.iowasmtime View
3crates.iowasmtime View
Total affected vendors: 2|Products: 3

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
5.7CVSS V40MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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:XNVD
5.7CVSS V4_0MEDIUMCVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCVE CNA
5.7CVSS 4.0—Vector not publishedGitHub Advisory

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-115892 is associated with the following CWEs:

CWE-843: Common Weakness Enumeration Entry CWE-843CWE-248: Common Weakness Enumeration Entry CWE-248

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-115892 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsHigh
User—

Official Sources and Advisories

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-9pvw-hwfg-92h5vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/pull/14819vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/pull/14820vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/pull/14827vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abdvendor-advisoryhttps://github.com/bytecodealliance/wasmtime/commit/48dacc76241f06088e79f3ce1b17642f2f7bf158vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7vendor-advisoryhttps://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4vendor-advisoryhttps://rustsec.org/advisories/RUSTSEC-2026-0378.htmlvendor-advisory

CVSS Vector Radar Chart

5.7 / 10
Attack VectorNetworkComplexityHighPrivilegesHighUser Interact.RequiredConfidentialityHighIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredHigh privileges
User InteractionP
Confidentiality (Gizlilik)High
Integrity (Bütünlük)P
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

B
bytecodealliance logo
bytecodealliance
C
crates.io logo
crates.io

Weakness Type (CWE & CAPEC)

CWE-843 CWE-248

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CVE-2026-115892 · Wasmtime: Panic lowering a host-created…