Vulnerability · CVE-2026-115391
Guest controlled-size host heap allocation through WASIp3 streams
Published Aug 20, 2026 · catalog updated Oct 24, 2026 · Red Hat Red Hat Enterprise Linux
Last checked Oct 27, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-115391. EPSS is 0.17%. Act only if a listed version of Red Hat Red Hat Enterprise Linux is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-116620 · High
- CVE-2026-116803 · Medium
- CVE-2026-116804 · Medium
- CVE-2026-116802 · Medium
- CVE-2026-116741 · Medium
- Severity
- Medium5.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.17%
- Remediation
- Advisory link
- Affected products
- crates.io wasmtime · package cargo
This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-x84v-gj2h-g759 For more information see the GitHub-hosted security advisory.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- crates.io wasmtime46.0.0 → 46.0.3
- package cargoversion unspecified
How to fix CVE-2026-115391
Upgrade
CVE-2026-115391 lists a fix boundary at 46.0.3. Compare the installed build with that boundary before you change production.
Version check
Seen in 46.0.0 → 46.0.3
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-115391. EPSS is 0.17%. Act only if a listed version of Red Hat Red Hat Enterprise Linux is installed.
Which versions are affected?
Compare what you have installed with 46.0.0 → 46.0.3. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-770: Allocation of Resources Without Limits or Throttling. EPSS 0.17%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 22, 2026 · Red Hat Security Data
Detected
wasmtime: wasmtime: Denial of Service via unbounded buffering in WASIp3 write streams
Oct 24, 2026 · GitHub Advisory Database
Fix available
wasmtime fixed in 46.0.3
Oct 24, 2026 · GitHub Advisory Database
Fix available
wasmtime fixed in 46.0.3
Oct 24, 2026 · GitHub Advisory Database
Updated
This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-x84v-gj2h-g759 For more information see the GitHub-hosted security advisory.
Sources
- CVE.orgVulnerability recordCVE-2026-115391
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-115391
30-day exploitation probability 0.17%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-x84v-gj2h-g759
GitHub Advisory Database record mirrored by OSV.
github.com - OpenSSF OSV / OSV ScannerPackage advisoryRUSTSEC-2026-0268
Guest controlled-size host heap allocation through WASIp3 streams
osv.dev - Red Hat Security DataVendor advisoryCVE-2026-115391
wasmtime: wasmtime: Denial of Service via unbounded buffering in WASIp3 write streams
access.redhat.com - Snyk Vulnerability DatabasePackage advisorySNYK-RUST-WASMTIME-21708536
Allocation of Resources Without Limits or Throttling
security.snyk.io
References
Freshness
Last verified in this catalog Oct 27, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- Snyk Vulnerability DatabaseOct 27, 2026
- FIRST EPSSOct 27, 2026
- GitHub Advisory DatabaseOct 26, 2026
- OpenSSF OSV / OSV ScannerOct 26, 2026
- Red Hat Security DataOct 24, 2026
- CVE.orgOct 23, 2026