Security readout for executives and security teams
Plain-English summary
CVE-2026-1738 is a remotely reachable denial-of-service flaw in Open5GS SGWC. A malformed or manipulated PDR argument can trigger an assertion and disrupt availability. The public record says affected versions include Open5GS 2.7.0 through 2.7.6, an exploit was published, and the issue is marked already fixed.
Executive priority
Treat as a near-term availability risk for Open5GS-based mobile core environments. Prioritize patch validation if Open5GS SGWC is internet-reachable, partner-reachable, or critical to service continuity. The risk is moderate overall, but public exploit availability increases urgency.
Technical view
The vulnerability is CWE-617 reachable assertion in /src/sgwc/context.c, function sgwc_tunnel_add, in the SGWC component. CVSS v4.0 is 6.9 with network attack vector, low complexity, no privileges, no user interaction, and low availability impact. Sources identify remote attack potential and public exploit availability, but not confirmed exploitation in the wild.
Likely exposure
Organizations running Open5GS SGWC versions 2.7.0 through 2.7.6 are potentially exposed, especially where SGWC interfaces are reachable from untrusted or less-controlled network segments. Exposure depends on deployment architecture and network filtering around the Open5GS control-plane components.
Exploitation context
Sources state the attack can be executed remotely and that exploit material has been published. CISA KEV status is false in the provided bundle, so active exploitation is not confirmed here. The expected business impact is service disruption rather than data theft or code execution based on the cited CVSS impacts.
Researcher notes
Evidence is strongest for affected versions, component, CWE, CVSS, and public exploit publication. The bundle does not provide a specific fixed version, commit, or operational indicator set. Avoid assuming active exploitation; KEV is false and no cited source confirms in-the-wild activity.
Mitigation direction
- Identify Open5GS deployments and confirm whether SGWC is in use.
- Upgrade to a vendor-fixed Open5GS version or apply the vendor patch.
- Review GitHub issue 4261 and official Open5GS guidance for fix details.
- Restrict SGWC exposure to trusted network paths where operationally possible.
- Monitor SGWC crashes, restarts, and assertion failures until remediated.
Validation and detection
- Inventory Open5GS versions and flag 2.7.0 through 2.7.6.
- Confirm whether /src/sgwc/context.c fix is present in deployed builds.
- Check service logs for SGWC assertion failures or unexpected restarts.
- Validate network controls limiting access to Open5GS control-plane interfaces.
- Track vendor issue status and release notes for remediation confirmation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-617: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-1738 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Source materials
- CVE List V5 sourceCVE List V5
- VDB-343637 | Open5GS SGWC context.c sgwc_tunnel_add assertionCVE reference · vdb-entry, technical-description
- VDB-343637 | CTI Indicators (IOB, IOC, IOA)CVE reference · signature, permissions-required
- Submit #741193 | Open5gs SGWC v2.7.6 Denial of ServiceCVE reference · third-party-advisory
- https://github.com/open5gs/open5gs/issues/4261CVE reference · issue-tracking, exploit
- https://github.com/open5gs/open5gs/CVE reference · product
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Reachable Assertion
Reachable Assertion represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.