HOMEVULNERABILITIESCVE-2026-27204
MEDIUM

CVE-2026-27204

CWE-400Published: February 24, 2026· Updated: Feb 25, 2026

6.5
CVSS v3.1
EPSS:0.06%probability of exploitation in 30 daysPercentile:19.3th

Official Description

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of WASI host interfaces are susceptible to guest-controlled resource exhaustion on the host. Wasmtime did not appropriately place limits on resource allocations requested by the guests. This serves as a Denial of Service vector. Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 have all been released with the fix for this issue. These versions do not prevent this issue in their default configuration to avoid breaking preexisting behaviors. All versions of Wasmtime have appropriate knobs to prevent this behavior, and Wasmtime 42.0.0-and-later will have these knobs tuned by default to prevent this issue from happening. There are no known workarounds for this issue without upgrading. Embedders are recommended to upgrade and configure their embeddings as necessary to prevent possibly-malicious guests from triggering this issue.

NVD Source

Technical Analysis

CVE-2026-27204 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

bytecodealliance1 product
wasmtime
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/bytecodealliance/wasmtime/pull/12599
ADVISORYhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-852m-cvvp-9p4w

All References (7)

→
https://docs.rs/wasmtime-wasi/latest/wasmtime_wasi/struct.WasiCtxBuilder.html#method.max_random_sizeProduct
→
https://docs.rs/wasmtime/latest/wasmtime/component/struct.ResourceTable.html#method.set_max_capacityProduct
→
https://docs.rs/wasmtime/latest/wasmtime/struct.Store.html#method.set_hostcall_fuelProduct
→
https://docs.wasmtime.dev/security-what-is-considered-a-security-vulnerability.htmlProduct
→
https://github.com/bytecodealliance/wasmtime/issues/11552Issue Tracking
→
https://github.com/bytecodealliance/wasmtime/pull/12599Issue Tracking · Third Party Advisory
→
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-852m-cvvp-9p4wThird Party Advisory

Quick Facts

CVE IDCVE-2026-27204
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-400
CISA KEVNo
EPSS (30d)0.06%
Affected1 vendor
PublishedFeb 24, 2026

Related CVEs (CWE-400)

CVE-2026-30141
9.8
CVE-2026-8856
9.1
CVE-2026-7790
8.7
CVE-2026-3505
8.7
CVE-2026-45169
8.7
CVE-2025-32424
8.7

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-27204 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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