EUVD-2026-80708
GHSA-gh4c-79cj-jr5j
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attacker must control the consumed SSE stream (PR:L) over the network with low complexity; impact is availability-only and partial (memory pressure), so A:L, C:N/I:N.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
1DescriptionCVE.org
A flaw has been found in ag-ui-protocol ag-ui 1.0. Affected is an unknown function of the file src/stream/sse_parser.cpp of the component JSON Parser. Executing a manipulation can lead to resource consumption. The attack may be performed from remote. This patch is called ab6e0bc298996caac2b4b0b3ec0bd8d32a15a186. Applying a patch is advised to resolve this issue.
AnalysisAI
Unbounded memory growth in the ag-ui (AG-UI protocol) C++ community SDK's Server-Sent Events parser lets an attacker who can control or influence the consumed SSE stream exhaust the parsing process's memory, producing a denial of service. The flaw lives in sdks/community/c++/src/stream/sse_parser.cpp, where the buffer guard compares only m_buffer plus the incoming chunk against kMaxBufferSize and ignores the per-event accumulator m_currentData, so a single event that is never terminated by a blank line and delivered as many small chunks grows without bound. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an application that uses the ag-ui C++ community SDK's SseParser to consume a Server-Sent Events stream, and an attacker able to control or influence that stream source (per the PR:L privilege). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but low-to-moderate priority denial-of-service issue, not a high-impact flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upstream fix available (PR/commit); released patched version not independently confirmed - the authoritative change is commit ab6e0bc298996caac2b4b0b3ec0bd8d32a15a186 (pull request https://github.com/ag-ui-protocol/ag-ui/pull/2501, tracking issue https://github.com/ag-ui-protocol/ag-ui/issues/2440), which adds m_currentData.size() to the kMaxBufferSize check so oversized never-terminated events throw SseBufferExceededError; apply that commit, cherry-pick it into the C++ SDK, or take the next tagged release that contains it. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Unbounded memory growth in the AG-UI Rust client's SSE frame parser (crates/ag-ui-client/src/sse.rs, shipped in the ag-u
Memory exhaustion in the AG-UI Go community SDK's SSE client allows a remote attacker who controls or can intercept an S
Origin validation errors in the AG-UI TypeScript client SDK (ag-ui 1.0) allow remote, low-privileged attackers who can i
A permissive cross-origin resource sharing (CORS) misconfiguration in the AG-UI aws-strands Python integration (ag-ui 0.
Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today