Quick answers
- Is CVE-2026-82590 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-82590 being exploited in the wild.
- How severe is CVE-2026-82590?
- Medium severity, with a CVSS score of 4.3, published 30 August 2026.
- Which products and versions are affected?
- Open5GS up to 2.7.7.
- Is there a fix for CVE-2026-82590?
- A patch was published on 2026-08-30: version 2.8.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-82590 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-82590?
- Check whether you run Open5GS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a reachable assertion in the smf_nudm_sdm_handle_get function within Open5GS's Session Management Function (SMF) component. The root cause is insufficient validation of the preemptCap argument when parsing QoS rules and flow descriptions in NAS message handling. An unauthenticated remote attacker can send a specially crafted PDU Session Modification Request with malformed QoS payloads to trigger an assertion failure that crashes the SMF process. The fix validates QoS rules and flow descriptions at parse time in src/nas before they reach SMF logic, preventing malformed structures from reaching the vulnerable code path. Patched in version 2.8.0 (commit 4554405).
Affected products
- Open5GS Open5GS up to 2.7.7
Timeline
- 2026-08-30: disclosed
- 2026-08-30: patched: version 2.8.0