blabbermouth

[blab-er-mouth]
noun, plural blabbermouths [blab-er-mouthz, -mouths] .
a person who talks too much, especially indiscreetly.

Origin:
1935–40, Americanism; blabber + mouth


gossip, gossipmonger, busybody, talebearer, bigmouth, tattler.
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World English Dictionary
blabbermouth (ˈblæbəˌmaʊθ)
 
n
informal a person who talks too much or indiscreetly

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In fact, clever attackers combine trusted input risks with blabbermouth error-reporting to exploit software.
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