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CVE-2026-91855— Open5GS PFCP Message handler.c denial of service

Quick assessment

Affected

n/a Open5GS

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open5GS是Open5GS组织开源的一套5G核心网络功能软件。 Open5GS 2.7.7及之前版本存在资源管理错误漏洞，该漏洞源于PFCP Message Handler组件中文件lib/pfcp/handler.c的未知功能处理不当，可能导致拒绝服务，远程攻击者可能利用此漏洞。

CVSS 5.3 · Medium EPSS 0.72% · P54 Updated Sep 16, 2026

Possible ATT&CK Techniques 2 AI

T1190 · Exploit Public-Facing Application T1499 · Endpoint Denial of Service

Affected Version Matrix 8

Vendor	Product	Version Range	Status
n/a	Open5GS	`2.7.0`	affected
		`2.7.1`	affected
		`2.7.2`	affected
		`2.7.3`	affected
		`2.7.4`	affected
		`2.7.5`	affected
		`2.7.6`	affected
		`2.7.7`	affected

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I. Basic Information for CVE-2026-91855

Vulnerability Information

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Vulnerability Title

Open5GS PFCP Message handler.c denial of service

Source: CVE Program / CVE List V5

Vulnerability Description

A security flaw has been discovered in Open5GS up to 2.7.7. Affected by this vulnerability is an unknown functionality of the file lib/pfcp/handler.c of the component PFCP Message Handler. Performing a manipulation results in denial of service. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks. The patch is named 028e1dbb5e3271035ccee906ef417a97fc523f71. Applying a patch is the recommended action to fix this issue. CVE-2025-29339 describes a different assertion failure vulnerability in Open5GS UPF.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

不恰当的资源关闭或释放

Source: CVE Program / CVE List V5

Vulnerability Title

Open5GS 资源管理错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
-	Open5GS	2.7.0	`cpe:2.3:a:open5gs:open5gs::::::::`

II. Public POCs for CVE-2026-91855

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-91855

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Patches & Fixes for CVE-2026-91855 (1)

🔗 [PFCP] Validate Outer Header Creation in Create/Update FAR · open5gs/open5gs@028e1db · GitHub Read full article patch

Proof of Concept for CVE-2026-91855 (1)

🔗 [Bug]: UPF crash in stateful PFCP sequence with repeated malformed Outer Header Creation · Issue #4699 · open5gs/open5gs Read full article exploit issue-tracking

https://www.cve.org/CVERecord?id=CVE-2026-91855

Same Patch Batch · n/a · 2026-09-15 · 34 CVEs total

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CVE-2026-91089	6.3 MEDIUM	GPAC base_scenegraph.c gf_node_get_name_and_id use after free
CVE-2026-91086	6.3 MEDIUM	GPAC MPEG Video Reframer reframe_mpgvid.c mpgviddmx_process heap-based overflow
CVE-2026-91849	6.3 MEDIUM	WuzhiCMS Avatar Upload index.php setAvatar unrestricted upload
CVE-2026-91088	4.8 MEDIUM	GPAC URL url.c gf_url_concatenate_ex heap-based overflow
CVE-2026-91091	4.3 MEDIUM	GPAC Node Insertion base_scenegraph.c gf_node_list_insert_child memory corruption
CVE-2026-91090	3.9 LOW	GPAC base_scenegraph.c gf_node_activate_ex stack-based overflow
CVE-2026-52484		MitraStar GPT-2742GL_g2.5远程代码执行漏洞
CVE-2026-51133		za-internet C-MOR ≤6.0104 跨站脚本漏洞
CVE-2025-66974		Prolink DS-3202M-UKv3 设备拒绝服务漏洞
CVE-2026-39040		BharatMLStack 1.3.0 Trufflebox UI XSS漏洞
CVE-2026-39038		BharatMLStack v1.3.0 存在XSS漏洞
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CVE-2026-79409		Bagisto 2.4.9 信息泄露漏洞
CVE-2026-88742		Bacularis 安全漏洞
CVE-2026-88743		Bacularis 安全漏洞
CVE-2026-79411		Bagisto 2.4.9 权限提升至管理员漏洞
CVE-2026-79410		Bagisto v2.4.9购物车参数校验缺陷致订单总价降低
CVE-2026-51134		C-MOR 6.0104 视频监控系统路径遍历

Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Open5GS

Same vendor: n/a

Same weakness: CWE-404