CVE-2026-90713

vllm-project vLLM tiktoken vocab File mod.rs new denial of service

Published Sep 14, 2026 CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed

Description

A security flaw has been discovered in vllm-project vLLM up to 0.29.0. The affected element is the function TiktokenTokenizer::new of the file rust/src/text/src/backend/hf/mod.rs of the component tiktoken vocab File Handler. The manipulation results in denial of service. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The pull request to fix this issue awaits acceptance.

Analysis

Technical impact

A flaw in the TiktokenTokenizer::new function of vllm-project vLLM allows a local attacker to manipulate the tiktoken vocabulary file and trigger a denial of service. The CVE description notes that the vulnerability results from improper handling and can be exploited only with local access, and the public exploit has already been released.

Affected Systems

vllm-project vLLM releases up to version 0.29.0 are impacted; no other vendors or products are listed as affected.

Risk and Exploitability

The CVSS score of 4.8 indicates a moderate impact potential, while the EPSS score of less than 1 % suggests a low probability of exploitation. The vulnerability is not listed in CISA’s KEV catalog. Exploitation requires local access to the system running vLLM and can be performed using the publicly available exploit; the pending pull request to fix the issue has not yet been merged.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

vllm-project

vLLM

affected

Version	Status	Constraints
`0.1`	affected	—
`0.2`	affected	—
`0.3`	affected	—
`0.4`	affected	—
`0.5`	affected	—
`0.6`	affected	—
`0.7`	affected	—
`0.8`	affected	—
`0.9`	affected	—
`0.10`	affected	—
`0.11`	affected	—
`0.12`	affected	—
`0.13`	affected	—
`0.14`	affected	—
`0.15`	affected	—
`0.16`	affected	—
`0.17`	affected	—
`0.18`	affected	—
`0.19`	affected	—
`0.20`	affected	—
`0.21`	affected	—
`0.22`	affected	—
`0.23`	affected	—
`0.24`	affected	—
`0.25`	affected	—
`0.26`	affected	—
`0.27`	affected	—
`0.28`	affected	—
`0.29.0`	affected	—

No data.

Vendor Product Versions

Vllm-project

Vllm

Version	Status	Scheme	Platform
`0.1`	affected	generic	—
`0.2`	affected	generic	—
`0.3`	affected	generic	—
`0.4`	affected	generic	—
`0.5`	affected	generic	—
`0.6`	affected	generic	—
`0.7`	affected	generic	—
`0.8`	affected	generic	—
`0.9`	affected	generic	—
`0.10`	affected	generic	—
`0.11`	affected	generic	—
`0.12`	affected	generic	—
`0.13`	affected	generic	—
`0.14`	affected	generic	—
`0.15`	affected	generic	—
`0.16`	affected	generic	—
`0.17`	affected	generic	—
`0.18`	affected	generic	—
`0.19`	affected	generic	—
`0.20`	affected	generic	—
`0.21`	affected	generic	—
`0.22`	affected	generic	—
`0.23`	affected	generic	—
`0.24`	affected	generic	—
`0.25`	affected	generic	—
`0.26`	affected	generic	—
`0.27`	affected	generic	—
`0.28`	affected	generic	—
`0.29.0`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Await the acceptance of Pull Request 51135 and upgrade vLLM to the patched version once it becomes available.
If an upgrade cannot be performed immediately, restrict local execution of TiktokenTokenizer::new by limiting file‑system access to the vocabulary file and running the tokenizer in a sandboxed environment to prevent tampering.
Implement runtime resource limits or enforce timeouts on the tokenizer routine to mitigate potential resource exhaustion until an official fix is released.

Generated by OpenCVE AI on September 21, 2026 at 01:19 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Access Vector Local

Access Complexity Low

Authentication Single

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.160% probability within 30 days)

Exploitation poc

Automatable no

Technical Impact partial

References

Link	Providers
https://gist.github.com/Yunzez/4b08ec3568a8cbfb120062e2558382b8
https://github.com/vllm-project/vllm/
https://github.com/vllm-project/vllm/issues/50954
https://github.com/vllm-project/vllm/pull/51135
https://nvd.nist.gov/vuln/detail/CVE-2026-90713
https://vuldb.com/cve/CVE-2026-90713
https://vuldb.com/submit/918762
https://vuldb.com/vuln/403267
https://vuldb.com/vuln/403267/cti
https://www.cve.org/CVERecord?id=CVE-2026-90713

History

Sep 15, 2026 3:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sep 15, 2026 12:15 PM Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-770
References		https://nvd.nist.gov/vuln/detail/CVE-2026-90713 https://www.cve.org/CVERecord?id=CVE-2026-90713
Metrics	threat_severity `None`	threat_severity `Low`

Sep 14, 2026 12:30 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A security flaw has been discovered in vllm-project vLLM up to 0.29.0. The affected element is the function TiktokenTokenizer::new of the file rust/src/text/src/backend/hf/mod.rs of the component tiktoken vocab File Handler. The manipulation results in denial of service. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The pull request to fix this issue awaits acceptance.
Title		vllm-project vLLM tiktoken vocab File mod.rs new denial of service
First Time appeared		Vllm-project Vllm-project vllm
Weaknesses		CWE-404
CPEs		cpe:2.3:a:vllm-project:vllm::::::::
Vendors & Products		Vllm-project Vllm-project vllm
References		https://gist.github.com/Yunzez/4b08ec3568a8cbfb120062e2558382b8 https://github.com/vllm-project/vllm/ https://github.com/vllm-project/vllm/issues/50954 https://github.com/vllm-project/vllm/pull/51135 https://vuldb.com/cve/CVE-2026-90713 https://vuldb.com/submit/918762 https://vuldb.com/vuln/403267 https://vuldb.com/vuln/403267/cti
Metrics		cvssV2_0 `{'score': 1.7, 'vector': 'AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR'}` cvssV3_0 `{'score': 3.3, 'vector': 'CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R'}` cvssV3_1 `{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R'}` cvssV4_0 `{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P'}`

Subscriptions

Vllm-project Vllm

Weaknesses

CWE-404
Improper Resource Shutdown or Release
CWE-770
Allocation of Resources Without Limits or Throttling

Sources

CVE record Updated: Sep 15, 2026, 1:57 PM

Status: PUBLISHED
Assigner: VulDB
Published: Sep 14, 2026, 12:00 PM
Updated: Sep 15, 2026, 1:57 PM
Reserved: Sep 13, 2026, 9:40 AM

View source JSON

Vulnrichment Updated: Sep 15, 2026, 1:42 PM

Updated: Sep 15, 2026, 1:42 PM

JSON

NVD Updated: Sep 15, 2026, 2:17 PM

Status: Deferred
Published: Sep 14, 2026, 1:19 PM
Modified: Sep 15, 2026, 2:17 PM

View source JSON

Red Hat Updated: Sep 14, 2026, 12:00 PM

Severity: Low
Public date: Sep 14, 2026, 12:00 PM

View source Bugzilla JSON

OpenCVE enrichment Updated: Sep 21, 2026, 1:30 AM

Updated: Sep 21, 2026, 1:30 AM

JSON

Analysis

Technical impact

Affected Systems

Risk and Exploitability

Affected Products

Remediation

Tracking

Advisories

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

Access Vector Local

Access Complexity Low

Authentication Single

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

Exploitation poc

Automatable no

Technical Impact partial

Subscriptions

Sources

JSON object

JSON object

JSON object

JSON object

JSON object