PT-2026-6669 · Free5Gc · Free5Gc

Linziyu · Published 2026-02-06 · Updated 2026-02-06 · CVE-2026-1976

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Free5GC versions prior to 4.1.1

Description A flaw exists in Free5GC up to version 4.1.0 within the SessionDeletionResponse function of the SMF component. This issue results in a null pointer dereference, potentially allowing for remote exploitation. The exploit for this issue has been publicly released.

Recommendations Install a patch to address this issue.

Exploit

Fix

Improper Resource Release

NULL Pointer Dereference

Weakness Enumeration

CWE-404

CWE-476

Related Identifiers

CVE-2026-1976

Affected Products

Free5Gc

References · 12

• 🔥 https://github.com/free5gc/free5gc/issues/817#issue-3832188092 · Exploit
• 🔥 https://vuldb.com/?submit.743239 · Exploit
• https://github.com/free5gc/free5gc/issues/817 · Vendor Advisory
• https://github.com/free5gc/smf/pull/189 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-1976 · Security Note
• https://osv.dev/vulnerability/CVE-2026-1976 · Vendor Advisory
• https://t.me/CVEtracker/43886 · Telegram Post
• https://vuldb.com/?id.344498 · Note
• https://t.me/cveNotify/151082 · Telegram Post
• https://vuldb.com/?ctiid.344498 · Note
• https://github.com/free5gc/free5gc · Note
• https://twitter.com/CVEnew/status/2019618720948318561 · Twitter Post