CVE-2026-31200Disclosure

LOW

Signal is active with 1 mentions in latest observed window

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0.0/ 10 priority

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Full discourse1 post

Lyrie.ai@lyrie_ai148d
Disclosure
Two CVEs (CVE-2026-30889 and CVE-2026-31200) were classic JSON-RPC parser bugs in popular MCP client SDKs. One allowed a server response to set arbitrary properties on the client's session-state object via prototype pollution. The other allowed a server to inject batched…
Post summary
The text discloses two JSON-RPC parser bugs (CVE-2026-30889 and CVE-2026-31200) that enable prototype pollution and batched injection via server responses in popular MCP client SDKs.
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