---
id: CVE-2026-118689
title: OvenMediaEngine through 0.21.0 OVT Relay DoS via Oversized payload_length
summary: >-
  OvenMediaEngine through 0.21.0 contains a denial of service vulnerability in
  OvtPacket::LoadHeader() that allows unauthenticated attackers to stall
  connections by sending payload_length values above 32750. Attackers can send
  crafted OVT …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-770
vendor: OvenMediaLabs
product: OvenMediaEngine
affected:
  - OvenMediaEngine <= 0.21.0
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-03T13:39:11.721243Z'
exploitAvailable: true
published: '2026-10-28'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T13:39:32.884Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118689'
references:
  - url: 'https://github.com/OvenMediaLabs/OvenMediaEngine/issues/2330'
    label: 'GitHub Issue #2330'
  - url: 'https://github.com/OvenMediaLabs/OvenMediaEngine'
  - url: >-
      https://github.com/OvenMediaLabs/OvenMediaEngine/blob/v0.21.0/src/modules/ovt_packetizer/ovt_packet.cpp#L48-L129
  - url: >-
      https://github.com/OvenMediaLabs/OvenMediaEngine/blob/v0.21.0/src/modules/ovt_packetizer/ovt_depacketizer.cpp#L32-L53
  - url: >-
      https://github.com/OvenMediaLabs/OvenMediaEngine/commit/ce316146d668a934217f25c777289ca256aa6786
  - url: >-
      https://www.vulncheck.com/advisories/ovenmediaengine-through-0.21.0-ovt-relay-dos-via-oversized-payload-length
    label: >-
      VulnCheck Advisory: OvenMediaEngine through 0.21.0 OVT Relay DoS via
      Oversized payload_length
tags:
  - cve.org
  - exploit-available
epss: 0.00509
epssPercentile: 0.43718
ingestedAt: '2026-10-30T21:09:21.613Z'
---

## Overview

OvenMediaEngine through 0.21.0 contains a denial of service vulnerability in OvtPacket::LoadHeader() that allows unauthenticated attackers to stall connections by sending payload_length values above 32750. Attackers can send crafted OVT packets to the OVT listener to hold connections open indefinitely and accumulate buffered memory, disrupting origin-to-edge stream relay.

## Affected

- `OvenMediaEngine <= 0.21.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.