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CVE-2026-5497

Vllm denial of service

7.5 HIGHPublic exploitEPSS 0.90%
  1. Published11 Jun 2026

Description

vLLM versions 0.8.0 and later are vulnerable to an Out-of-Memory (OOM) Denial of Service (DoS) attack due to unbounded frame count processing in the `VideoMediaIO.load_base64()` method. When processing `video/jpeg` data URLs, the method splits the base64 data string on commas to extract individual JPEG frames without enforcing a frame count limit. An attacker can exploit this by crafting a single API request containing thousands of comma-separated base64-encoded JPEG frames in a data URL, causing the server to decode all frames into memory and crash due to excessive memory consumption. This vulnerability is reachable via the OpenAI-compatible chat completions API and does not require authentication.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Vllm≥ 0.8.0 < 0.19.0

Remediation

Fixed in
Vllm≥ 0.19.0

References

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Frequently asked

Is CVE-2026-5497 being actively exploited?

CVE-2026-5497 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.90%.

How severe is CVE-2026-5497?

CVE-2026-5497 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.90% probability of exploitation.

Which products are affected by CVE-2026-5497?

Affected products include Vllm.

How do I fix CVE-2026-5497?

Upgrade affected software to a fixed version, for example Vllm 0.19.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-5497 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.