Memory exhaustion in Open5GS HTTP/2 SBI server causes crashes
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-400.
Summary
Open5GS v2.8.0 HTTP/2 SBI server leaks previously allocated header strings when header names repeat (CWE-400). An unauthenticated remote attacker can use HPACK compression to send tens of thousands of duplicate headers in a small request. Repeated crafted requests cause persistent heap growth, exhaust process memory, and terminate the affected Open5GS network function, resulting in denial of service.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Description from the CNA
A memory exhaustion issue exists in Open5GS v2.8.0 in the HTTP/2 SBI server. Repeated header names cause previously allocated header strings to be leaked, and HPACK compression allows an unauthenticated remote attacker to trigger tens of thousands of duplicate headers with a small request. Repeated crafted requests can cause persistent heap growth, exhaust process memory, and terminate the affected Open5GS network function, resulting in denial of service.
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Open5GS.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Timeline
- 2026-11-02 Threatist record created from CVE-2026-106806
- 2026-11-02 Alias added: GHSA-c4rp-26v8-cm35
- 2026-11-05 CVSS score added · CISA ADP
- 2026-11-05 Weakness changed · CISA ADP
- 2026-11-05 CISA SSVC decision points changed
- 2026-11-05 Priority changed: LOW → HIGH
References
Sources
- CVE-2026-106806 · CVE Program
- CVE-2026-106806 · NVD
- FIRST EPSS
- GHSA-c4rp-26v8-cm35 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences