CVE.org (no NVD analysis yet)· CNA GitHub_M

CVE-2026-115918: vLLM: Responses API bypasses trust_request_chat_template for chat_template_kwargs

MediumCVSS 6.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 26/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.35% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: vllm-project vllm 0.32.0.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to vllm-project vllm 0.32.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

vLLM is an inference and serving engine for large language models. From 0.16.0 until 0.32.0, the /v1/responses endpoint allows an authenticated caller to place an attacker-controlled template in chat_template_kwargs[chat_template] when no server template is configured. ChatParams.get_apply_chat_template_kwargs() preserves that value without enforcing trust_request_chat_template, so the request can bypass the intended trust policy and cause CPU or memory exhaustion through Jinja rendering. This issue is fixed in version 0.32.0.

Denial of service

Published: Oct 26, 2026
Updated: Oct 30, 2026
EPSS: 0.3% · 29th percentile
CWE: CWE-400

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 26 / 40 · 6.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · GitHub_M: 6.5; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
vllm	vllm	cpe:2.3:a:vllm:vllm

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

vllm-project vllm
- >= 0.16.0, < 0.32.0affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

vllm vllm0.16.0 and later · before 0.32.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
PyPI	vllm	from 0.16.0 · before 0.32.0	0.32.0

Same product

vllm: all records

Other highest-scoring records for the same primary product.

CVE-2026-22778vLLM leaks a heap address when PIL throws an error
60This week
CVE-2025-32444vLLM Vulnerable to Remote Code Execution via Mooncake Integration
40Plan
CVE-2024-11041Remote Code Execution in vllm-project/vllm
40Plan

Published before and after this one in the same product

← EarlierCVE-2026-115915Oct 26, 2026 · vLLM: Untrusted EPS inputs can trigger denial of service or Ghostscript RCE
39Monitor
← EarlierCVE-2026-115916Oct 26, 2026 · vLLM: Out-of-vocabulary prompt token id passes input validation and triggers a CUDA device-side assert (engine crash / DoS)
26Monitor
← EarlierCVE-2026-115917Oct 26, 2026 · vLLM: Permissive default CORS origins allow cross-origin requests to the vLLM HTTP server
18Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
vllm-project vllm	0.32.0 · description	Vendor (CNA)
PyPI:vllm	0.32.0	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedOct 26, 2026
Fix recordedOct 26, 2026same day
TodayNov 13, 2026+18 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-1161771 days apartvLLM 0.10.2 before 0.25.0 DoS via Nemotron-VL Processor Decompression-Bomb Guard Bypass
34Monitor
CVE-2026-1140555 days apartvLLM 0.7.3 before 0.31.0 DoS via Unvalidated mm_processor_kwargs
34Monitor
CVE-2026-10575921 days apartvLLM: Unbounded Prometheus label cardinality from attacker-controlled HTTP method tokens in the vLLM Rust frontend metrics middleware (unauthenticated denial…
30Monitor
CVE-2026-3723759 days apartvLLM up to and including 0.17.0 allows remote attackers to cause a Denial of Service via memory exhaustion.
30Monitor
CVE-2026-5497137 days apartUnbounded Frame Count in video/jpeg Base64 Data URL Processing Leads to OOM DoS in vllm-project/vllm
30Monitor
CVE-2025-48956431 days apartvLLM API endpoints vulnerable to Denial of Service Attacks
30Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-1401 · Oct 27, 2026(vLLM Güvenlik Zafiyeti)

All national notices →

Not on record for this CVE: researcher credit · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

SSVC exploitation— → noneOct 30, 2026, 4:07 PM UTC
Exploit maturity— → noneOct 26, 2026, 7:07 PM UTC
Fix✗ → ✓Oct 26, 2026, 7:07 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/vllm-project/vllm/commit/cff08b461e086523cee8bba5bd3c66d302625134

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records