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Vulnerability details: VCID-n4g4-x1ag-9kae
Vulnerability ID VCID-n4g4-x1ag-9kae
Aliases CVE-2026-33054
GHSA-8qvf-mr4w-9x2c
Summary Mesop is a Python-based UI framework that allows users to build web applications. Versions 1.2.2 and below contain a Path Traversal vulnerability that allows any user supplying an untrusted state_token through the UI stream payload to arbitrarily target files on the disk under the standard file-based runtime backend. This can result in application denial of service (via crash loops when reading non-msgpack target files as configurations), or arbitrary file manipulation. This vulnerability heavily exposes systems hosted utilizing FileStateSessionBackend. Unauthorized malicious actors could interact with arbitrary payloads overwriting or explicitly removing underlying service resources natively outside the application bounds. This issue has been fixed in version 1.2.3.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2026-33054
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2026-33054
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2026-33054
epss 0.00034 https://api.first.org/data/v1/epss?cve=CVE-2026-33054
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-8qvf-mr4w-9x2c
cvssv3.1 10.0 https://github.com/mesop-dev/mesop
generic_textual CRITICAL https://github.com/mesop-dev/mesop
cvssv3.1 10 https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b
cvssv3.1 10.0 https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b
generic_textual CRITICAL https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b
ssvc Track* https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b
cvssv3.1 10 https://github.com/mesop-dev/mesop/releases/tag/v1.2.3
cvssv3.1 10.0 https://github.com/mesop-dev/mesop/releases/tag/v1.2.3
generic_textual CRITICAL https://github.com/mesop-dev/mesop/releases/tag/v1.2.3
ssvc Track* https://github.com/mesop-dev/mesop/releases/tag/v1.2.3
cvssv3.1 10 https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
cvssv3.1 10.0 https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
cvssv3.1_qr CRITICAL https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
generic_textual CRITICAL https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
ssvc Track* https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
cvssv3.1 10.0 https://nvd.nist.gov/vuln/detail/CVE-2026-33054
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2026-33054
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-33054
https://github.com/mesop-dev/mesop
https://nvd.nist.gov/vuln/detail/CVE-2026-33054
c6b382f363b73ac32c402a2db3aadc7784f66a5b https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b
GHSA-8qvf-mr4w-9x2c https://github.com/advisories/GHSA-8qvf-mr4w-9x2c
GHSA-8qvf-mr4w-9x2c https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
v1.2.3 https://github.com/mesop-dev/mesop/releases/tag/v1.2.3
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/mesop-dev/mesop
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-03-20T13:50:11Z/ Found at https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/mesop-dev/mesop/releases/tag/v1.2.3
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/mesop-dev/mesop/releases/tag/v1.2.3
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-03-20T13:50:11Z/ Found at https://github.com/mesop-dev/mesop/releases/tag/v1.2.3
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:T/P:M/B:A/M:M/D:R/2026-03-20T13:50:11Z/ Found at https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-33054
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.10376
EPSS Score 0.00034
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:49:26.357441+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/33xxx/CVE-2026-33054.json 38.6.0