OvenMediaEngine OVT Relay denial of service via oversized payload_length
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.
Summary
OvenMediaEngine through 0.21.0 contains a denial of service flaw in OvtPacket::LoadHeader() that lets unauthenticated remote attackers stall connections by sending oversized payload_length values above 32750. Attackers can hold connections open indefinitely through the OVT listener, accumulating buffered memory and disrupting origin-to-edge stream relay (CWE-770).
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OvenMediaLabs | OvenMediaEngine | up to 0.21.0 | — | No fix listed | CNA |
- OvenMediaEngine VendorOvenMediaLabs Affected up to 0.21.0 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for OvenMediaEngine.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Timeline
- 2026-10-28 Threatist record created from CVE-2026-118689
- 2026-10-29 Alias added: GHSA-c237-3r77-c8g5
- 2026-10-30 Priority changed: MEDIUM → LOW
- 2026-11-03 CISA SSVC decision points changed
- 2026-11-03 Priority changed: LOW → HIGH
References
Patch 1
Other 4
Sources
- CVE-2026-118689 · CVE Program
- CVE-2026-118689 · NVD
- FIRST EPSS
- GHSA-c237-3r77-c8g5 · GitHub Advisory Database · CC BY 4.0
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