# CVE-2026-118689: OvenMediaEngine through 0.21.0 OVT Relay DoS via Oversized payload_length

Status: published. Published: 2026-10-28. Updated: 2026-11-03.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/OvenMediaLabs/OvenMediaEngine/commit/ce316146d668a934217f25c777289ca256aa6786

## Affected products and versions

- OvenMediaLabs / OvenMediaEngine: ≥ 0; ≤ 0.21.0 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.51% as of 2026-11-02; percentile 43.45%

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-770

## Exploit evidence

- exploit: https://github.com/OvenMediaLabs/OvenMediaEngine/issues/2330 (ADP: CISA-ADP)

## References

- https://github.com/OvenMediaLabs/OvenMediaEngine/issues/2330 (CNA: VulnCheck; issue-tracking)

- https://github.com/OvenMediaLabs/OvenMediaEngine (CNA: VulnCheck; product)

- https://github.com/OvenMediaLabs/OvenMediaEngine/blob/v0.21.0/src/modules/ovt_packetizer/ovt_packet.cpp#L48-L129 (CNA: VulnCheck; technical-description)

- https://github.com/OvenMediaLabs/OvenMediaEngine/blob/v0.21.0/src/modules/ovt_packetizer/ovt_depacketizer.cpp#L32-L53 (CNA: VulnCheck; technical-description)

- https://github.com/OvenMediaLabs/OvenMediaEngine/commit/ce316146d668a934217f25c777289ca256aa6786 (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/ovenmediaengine-through-0.21.0-ovt-relay-dos-via-oversized-payload-length (CNA: VulnCheck; third-party-advisory)

- https://github.com/OvenMediaLabs/OvenMediaEngine/issues/2330 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-118689; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118689; retrieved 2026-11-03; source updated Not reported

Revision: fc3eeb48e2acd03a8142e8e459c4f63ccf98316b743f3ed3448ebc3c87c2f7c3

Canonical: https://y2.dev/cve/CVE-2026-118689

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