GCD AI RADAR
incidents/AIR-2026-1402

Stealthy Poisoning Attacks via Reused KV Cache of Reasoning

Attack on AI1 Research / proof of conceptData poisoning

Researchers demonstrate a black-box poisoning attack called R2ECAP that plants poisoned reasoning traces by exploiting reused key-value caches in large language models. The attack manipulates model behavior solely through interactions with the chat interface.

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Data poisoning
    Training or retrieval data manipulated to change model behaviour.
owasp llm top 10
mitre atlas
no technique for these categories
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
1 · Research / proof of concept
Demonstrated by researchers; no known real-world exploitation.
targets
Open-weight model
incident date
19 Oct 2026
first reported
19 Oct 2026
origin
News & research feeds
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
kv-cache · data-poisoning · reasoning-traces · black-box-attack
record
created 2026-10-19 05:07Z · updated 2026-10-19 05:07Z · json

Sources · 1

  1. 2026-10-19
    Stealthy Poisoning Attacks via Reused KV Cache of Reasoning
    arXiv · arxiv.org/abs/2610.22873

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