CVE-2026-120236: ag-ui-protocol ag-ui

ag-ui-protocol ag-ui Transport Decoder input validation

CVSS 5.3 MediumEPSS 0.0027 · 18th percentile

Published by the CVE Program (CNA: VulDB) at 1 Nov 2026, 16:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
ag-ui-protocol	ag-ui	affected 0.0.1 affected 0.0.2 affected 0.0.3 affected 0.0.4 affected 0.0.5 affected 0.0.6 affected 0.0.7 affected 0.0.8 affected 0.0.9 affected 0.0.10 affected 0.0.11 affected 0.0.12 and 46 more

Identifiers

CVE-2026-120236

CNA

VulDB

Weakness (CWE)

CWE-20

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.3	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P	CNA (VulDB)Used for this record
6.3	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	CNA (VulDB)
6.3	Medium	3.0	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	CNA (VulDB)
6.5	Medium	2.0	AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C	CNA (VulDB)

CISA KEV Not listed.
EPSS 0.0027, the 18th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1 Nov 2026, 16:45 UTC Confirmed by the CVE List
1 Nov 2026, 16:52 UTC First seen by agentprime
1 Nov 2026, 17:16 UTC Confirmed by NVD

Sources

References from the CNA

vuldb.com/vuln/429595 vdb-entry
vuldb.com/vuln/429595/cti signaturepermissions-required
vuldb.com/cve/CVE-2026-120236 third-party-advisory
vuldb.com/submit/1015178 third-party-advisory
github.com/ag-ui-protocol/ag-ui/pull/2774 issue-trackingpatch
github.com/ag-ui-protocol/ag-ui/commit/660182b973a44b8eda5484b14b88eb9cc251edc4 patch
github.com/ag-ui-protocol/ag-ui/releases/tag/release/2026-10-30 patch
github.com/ag-ui-protocol/ag-ui/ product
github.com/ag-ui-protocol/ag-ui/issues/2524 exploitissue-tracking

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.