EUVD-2026-80703
GHSA-469m-pffj-3v74
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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
Remote unterminated SSE stream exhausts client memory (availability-only, single process → A:L); no confidentiality or integrity impact, so VulDB's C:L/I:L are unjustified.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability was detected in ag-ui-protocol ag-ui 1.0. This impacts an unknown function of the file crates/ag-ui-client/src/sse.rs of the component SSE Frame Parser. Performing a manipulation results in resource consumption. The attack is possible to be carried out remotely. The pull request to fix this issue awaits acceptance.
AnalysisAI
Unbounded memory growth in the AG-UI Rust client's SSE frame parser (crates/ag-ui-client/src/sse.rs, shipped in the ag-ui 1.0 community SDK) lets a malicious, compromised, or machine-in-the-middle SSE server exhaust the memory of the consuming client process by streaming a frame it never terminates with a blank-line delimiter. No public exploit code has been identified at time of analysis and the issue is not confirmed as actively exploited (CISA KEV), but the outcome is a denial of service confined to the client process, matching the independently assessed CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L rather than the higher CVSS 4.0 score of 6.9. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ag-ui Rust client (crates/ag-ui-client) to open an SSE connection to an endpoint the attacker controls, has compromised, or can machine-in-the-middle; the malicious server then withholds the frame delimiter and streams an unterminated frame that grows the client's read buffer without bound. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but low-severity availability issue, not a high-priority emergency. … 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 | The fix is upstream in PR #2500 (https://github.com/ag-ui-protocol/ag-ui/pull/2500), which adds an 8 MiB per-frame cap (SSE_MAX_BUFFER_BYTES) and terminates the stream on overflow; however, the description states the pull request awaits acceptance, so the status is "Upstream fix available (PR/commit); released patched version not independently confirmed" - there is no confirmed tagged release containing the fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
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View allSame technique Denial Of Service
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External POC / Exploit Code
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