Medium severity · published Oct 9, 2026
CVE-2026-108105
Open5GS through 2.8.0 MME Reachable Assertion via GTPv1 SGSN Context Request
5.9
CVSS
0.5%
EPSS
No
On KEV
Description
Open5GS through 2.8.0 contains a reachable assertion vulnerability in mme_gn_handle_sgsn_context_request() that allows remote unauthenticated attackers to crash the MME via malformed SGSN Address IEs. Attackers sending GTPv1-C traffic from a configured SGSN address with a known UE IMSI or P-TMSI can supply an invalid address length to terminate open5gs-mmed, denying service to all subscribers.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open5gs · open5gs
through 2.8.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-108105
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-108105
patch
https://github.com/open5gs/open5gs/commit/346ce7a5e5cf2812bac3af042b5afba35bcf4f89
product
https://github.com/open5gs/open5gs
vendor-advisory
https://github.com/open5gs/open5gs/security/advisories/GHSA-9crh-64c8-56q6
technical-description
https://github.com/open5gs/open5gs/blob/v2.8.0/src/mme/mme-gn-handler.c#L208-L217
third-party-advisory
https://www.vulncheck.com/advisories/open5gs-through-2.8.0-mme-reachable-assertion-via-gtpv1-sgsn-context-request
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