CVE-2026-25657: Ericsson Packet Core Gateway (PCG) - Improper Handling of Syntactically Invalid Structure Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-05 · updated 2026-10-26
Weakness: CWE-228

Description

Ericsson Packet Core Gateway (PCG) versions prior to 1.30 contain an Improper Handling of Syntactically Invalid Structure (CWE-228) vulnerability where an attacker continuously sending a specially crafted message can cause service degradation. The impact continues as long the attack persists but the system recovers from the crashes when the attack stops.

Affected products

Ericsson Packet Core Gateway (PCG): before 1.30 — fixed in 1.30

How to fix

Upgrade to a fixed version: Ericsson Packet Core Gateway (PCG) 1.30. Check the vendor advisory for mitigations.

References

https://www.ericsson.com/en/about-us/security/psirt/cve-2026-25657

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