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Vulnerability · Published Mar 20, 2026 · Assigned by GitHub_M

CVE-2026-33192free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques

High 8.7

In plain English

A high-severity security flaw in free5gc from free5gc. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.3%top 73.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. In versions prior to 1.4.2, the UDM incorrectly converts a downstream 400 Bad Request (from UDR) into a 500 Internal Server Error when handling PATCH requests with an empty supi path parameter. Additionally, the UDM incorrectly translates the PATCH method to PUT when forwarding to UDR, indicating a deeper architectural issue. This leaks internal error handling behavior, making it difficult for clients to distinguish between client-side errors and server-side failures. The issue has been patched in version 1.4.2.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/free5gc/udm1.4.2GHSA-5rvc-5cwx-g5x8
Gogithub.com/free5gc/udm1.4.2GO-2026-4755
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2026-33192
Ubuntu:25.10linuxno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2026-33192
Ubuntu:25.10linux-awsno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-aws-6.17no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2026-33192
Ubuntu:25.10linux-azureno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-azure-6.17no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2026-33192
Ubuntu:25.10linux-gcpno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-gcp-6.17no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-hwe-6.17no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-oem-6.17no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2026-33192
Ubuntu:25.10linux-oracleno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-oracle-6.17no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-oracle-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-raspino fix listedUBUNTU-CVE-2026-33192
Ubuntu:25.10linux-raspino fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:25.10linux-realtimeno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2026-33192
Ubuntu:25.10linux-riscvno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-riscv-6.17no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-riscv-6.8no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2026-33192
Ubuntu:24.04:LTSlinux-xilinxno fix listedUBUNTU-CVE-2026-33192
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2026-33192

Affected products (as reported)

VendorProductVersions
free5gc free5gc < 1.4.2

Weakness: CWE-209 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References