CVE-2026-8746

Open5GS NRF nghttp2-server.c discover_handler use after free

State: Published
Severity: 5.3 Medium
Published: May 17, 2026
Updated: May 18, 2026
Reserved: May 16, 2026

Description

A security flaw has been discovered in Open5GS up to 2.7.7. Affected by this issue is the function discover_handler in the library /lib/sbi/nghttp2-server.c of the component NRF. The manipulation results in use after free. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R	VulDB
3.0	4.3 Medium	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R	VulDB
2.0	4.0 Medium	AV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR	VulDB

Weaknesses

CWE-416 Use After Free
CWE-119 Memory Corruption

Affected Products

Product	Versions
Open5GSn/a	2.7.0Affected 2.7.1Affected 2.7.2Affected 2.7.3Affected 2.7.4Affected 2.7.5Affected 2.7.6Affected 2.7.7Affected

References

VDB-364333 | Open5GS NRF nghttp2-server.c discover_handler use after freevdb-entrytechnical-description
VDB-364333 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
Submit #817032 | Open5GS NRF v2.7.7 Denial of Servicethird-party-advisory
https://github.com/open5gs/open5gs/issues/4476exploitissue-tracking
https://github.com/open5gs/open5gs/product

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