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CVE-2026-49943

Quick assessment

Affected
NIC BIRD
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.

BIRD是BIRD开源的一个全功能的动态IP路由守护程序。 BIRD 2.19.0及之前版本存在安全漏洞，该漏洞源于BGP AS_PATH掩码匹配实现中存在栈缓冲区溢出，可能导致守护进程崩溃。

CVSS 6.3 · Medium EPSS 0.40% · P31

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
NIC BIRD ≤ 2.19.0 affected
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I. Basic Information for CVE-2026-49943

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
CZ.NIC BIRD Internet Routing Daemon through 2.19.0 contains a stack-based buffer overflow in the BGP AS_PATH mask matching implementation in nest/a-path.c. The as_path_match() function uses a fixed-size stack array of 2048 + 1 pm_pos entries, while parse_path() expands AS_PATH segments from a received BGP UPDATE without enforcing a corresponding capacity limit. When RFC 8654 BGP Extended Messages are enabled and a BIRD filter evaluates an AS path mask expression such as "bgp_path ~ [= ... =]", an established BGP peer can send a long AS_PATH containing more than 2048 expanded ASNs. This causes parse_path()/as_path_match() to write beyond the fixed stack buffer, resulting in a crash of the daemon. NOTE: reportedly, the Supplier's position is that a fix is not being prioritized because all network operators should already be rejecting routes with unusually long attributes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
BIRD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BIRD是BIRD开源的一个全功能的动态IP路由守护程序。 BIRD 2.19.0及之前版本存在安全漏洞，该漏洞源于BGP AS_PATH掩码匹配实现中存在栈缓冲区溢出，可能导致守护进程崩溃。
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
NIC BIRD 0 ~ 2.19.0 -

II. Public POCs for CVE-2026-49943

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III. Intelligence Information for CVE-2026-49943

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Vendor Pages for CVE-2026-49943 (2)

IV. Related Vulnerabilities

Same vendor: NIC
Same weakness: CWE-121

V. Comments for CVE-2026-49943

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