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CVE-2026-49838— GoBGP confederation validation panics on empty AS_PATH attribute

Quick assessment

Affected
osrg gobgp
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.

GoBGP 是 Go 语言实现的开源边界网关协议（BGP）工具。在 4.7.0 版本之前，GoBGP 在解码 UPDATE 消息时会接受长度为零的 AS_PATH，随后在对联盟 eBGP 对等体进行属性校验时发生 panic（异常崩溃）。具体漏洞路径位于 BGP UPDATE 校验器中：本应因 AS_PATH 格式错误而被拒绝的畸形 UPDATE 消息，却触发了对 的未检查数组访问，从而允许已配置的联盟 eBGP 对等体引发服务拒绝（DoS）。该问题在 4.7.0 版本中已得到修复。

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-49838

Vulnerability Information
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Vulnerability Title
GoBGP confederation validation panics on empty AS_PATH attribute
Source: CVE Program / CVE List V5
Vulnerability Description
GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.7.0, GoBGP accepts a zero-length AS_PATH during UPDATE decoding and later panics while validating that attribute for a confederation eBGP peer. The vulnerable path is in the BGP UPDATE validator: a malformed UPDATE that should be rejected as a malformed AS_PATH instead reaches an unchecked `p.Value[0]` access, allowing a configured confederation eBGP peer to trigger a denial of service. Version 4.7.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数组索引的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
osrg gobgp < 4.7.0 -

II. Public POCs for CVE-2026-49838

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III. Intelligence Information for CVE-2026-49838

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Patches & Fixes for CVE-2026-49838 (1)

Vendor Advisories for CVE-2026-49838 (1)

IV. Related Vulnerabilities

Same product: gobgp
Same vendor: osrg
Same weakness: CWE-129

V. Comments for CVE-2026-49838

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