CVE-2026-118689
OvenMediaEngine through 0.21.0 OVT Relay DoS via Oversized payload_length
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| OvenMediaEngine OvenMediaLabs |
≥ 0; ≤ 0.21.0 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 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 | CNA: VulnCheck |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: VulnCheck |
Exploit evidence
- https://github.com/OvenMediaLabs/OvenMediaEngine/issues/2330
exploit · ADP: CISA-ADP
References
- https://github.com/OvenMediaLabs/OvenMediaEngine/issues/2330CNA: VulnCheck · issue-tracking
- https://github.com/OvenMediaLabs/OvenMediaEngineCNA: VulnCheck · product
- https://github.com/OvenMediaLabs/OvenMediaEngine/blob/v0.21.0/src/modules/ovt_packetizer/ovt_packet.cpp#L48-L129CNA: VulnCheck · technical-description
- https://github.com/OvenMediaLabs/OvenMediaEngine/blob/v0.21.0/src/modules/ovt_packetizer/ovt_depacketizer.cpp#L32-L53CNA: VulnCheck · technical-description
- https://github.com/OvenMediaLabs/OvenMediaEngine/commit/ce316146d668a934217f25c777289ca256aa6786CNA: VulnCheck · patch
- https://www.vulncheck.com/advisories/ovenmediaengine-through-0.21.0-ovt-relay-dos-via-oversized-payload-lengthCNA: VulnCheck · third-party-advisory
- https://github.com/OvenMediaLabs/OvenMediaEngine/issues/2330ADP: CISA-ADP · exploit
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