CVE-2026-120235: A security vulnerability has been detected in ag-ui-protocol ag-ui up to 0.0.58

Routine

MEDIUM 4.3

CVE-2026-120235 is a medium-severity flaw (CVSS 4.3) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A security vulnerability has been detected in ag-ui-protocol ag-ui up to 0.0.58. Affected is the function parseSSEStream of the file sdks/typescript/packages/client/src/transform/sse.ts of the component SSE Parser. The manipulation leads to resource consumption. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The identifier of the patch is 9e7b2b00bce215bbf731f1e6094f63812527c432. The affected compon

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-400, CWE-404
Published	2026-11-01
Last modified	2026-11-01

Publisher (CNA): VulDB

Last updated 2026-11-01 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-11-01 16:18 UTCPublished CVE record published
2026-11-01 16:18 UTCUpdated Record last modified

Advisories and coverage

Research and news

Vulners Bulletins: CVE-2026-120235 ag-ui-protocol ag-ui SSE Parser sse.ts parseSSEStream resource consumption 2026-11-01
Vulners Bulletins: CVE-2026-120235 ag-ui-protocol ag-ui SSE Parser sse.ts parseSSEStream resource consumption 2026-11-01
VulDB Recent Entries: CVE-2026-120235 | ag-ui-protocol ag-ui up to 0.0.58 SSE Parser sse.ts parseSSEStream resource consumption (Issue 2522) 2026-10-31

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-120235?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-120235 being exploited?

CVE-2026-120235 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-120235 affect?

CVE-2026-120235 affects affected software. Severity is medium (CVSS 4.3). A security vulnerability has been detected in ag-ui-protocol ag-ui up to 0.0.58. Affected is the function parseSSEStream of the file sdks/typescript/packages/client/src/transform/sse.ts of the component SSE Parser. The manipulation leads to

How urgent is CVE-2026-120235?

Priority 15/100. No elevated risk signals yet.

References

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