Bug 2546184 (CVE-2026-105755)

Summary: CVE-2026-105755 vllm: vllm: Scoring result corruption via user-controlled request identifier
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: alinfoot, bbrownin, dtrifiro, weaton
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in vLLM. When handling flash late-interaction scoring and reranking requests, internal cache keys are derived directly from user-supplied request identifiers. A remote attacker can exploit this issue by submitting concurrent requests reusing a victim's request identifier to overwrite cached query data. Consequently, this flaw allows attackers to corrupt the scoring results returned to legitimate users or cause a denial of service (DoS) through transient cache errors.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-05 23:01:30 UTC 
vLLM is an inference and serving engine for large language models. Prior to 0.30.0, flash late-interaction scoring at the /score and /rerank endpoints derives each worker's query_key value from the caller-controlled X-Request-Id header. A concurrent request that reuses a victim's identifier can overwrite the cached query embedding so the victim's documents are scored against the attacker's query, and shared use counters can also cause a late-interaction cache-miss error. This issue is fixed in version 0.30.0.