EUVD-2026-80771
GHSA-mcqv-hjvx-mmqr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Authenticated network API client (PR:L) triggers O(L^2) CPU at low complexity; impact is partial availability degradation only, no confidentiality or integrity effect.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
4DescriptionCVE.org
A vulnerability was found in vllm-project vllm up to 0.29.0. Affected by this issue is some unknown functionality of the file vllm/v1/sample/thinking_budget_state.py. The manipulation results in inefficient algorithmic complexity. It is possible to launch the attack remotely. The pull request to fix this issue awaits acceptance.
AnalysisAI
Inefficient algorithmic complexity (CWE-407) in vLLM up to and including 0.29.0 causes the thinking-budget marker search in vllm/v1/sample/thinking_budget_state.py to re-scan an ever-growing output token buffer on every decode step, degrading throughput and consuming CPU when serving reasoning-capable models. An authenticated API client (CVSS 4.0 vector lists PR:L) that sets the thinking_token_budget sampling parameter can trigger the quadratic blowup, but only when the generated output never contains the configured reasoning start/end marker token sequences, so the internal search cursors fail to advance; the practical worst case is partial availability loss (slowed or stalled generation per affected request) rather than a crash, code execution, or any confidentiality/integrity impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires vLLM to be serving a reasoning-capable model with the thinking-budget feature active, and the attacker must be an authenticated API client (PR:L) able to set the thinking_token_budget sampling parameter. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but low-severity availability issue, and the vendor CVSS 4.0 score of 5.3 (AV:N/AC:L/AT:N/PR:L/UI:N/VA:L) is well-calibrated. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Track and apply upstream pull request https://github.com/vllm-project/vllm/pull/51133, which introduces the bounded _find_last_sequence_index_from helper and advances start_search_pos/end_search_pos so previously scanned tokens are never re-examined; because the PR awaits maintainer acceptance, upstream fix available (PR/commit); released patched version not independently confirmed - upgrade to the first vLLM release that contains this change once it is tagged, and meanwhile pin to a build revendoring commit ed908cf0a's revert if you cannot wait. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-407 – Inefficient Algorithmic Complexity
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External POC / Exploit Code
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