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CVE-2026-121603— Solanum before commit 2ea1382 Buffer Overflow via Server-to-Server KILL Handler

Quick assessment

Affected
solanum-ircd solanum
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.

在提交 2ea1382 之前的 Solanum 版本中， 函数存在缓冲区溢出漏洞。恶意链接的服务器可通过发送过长的踢出理由来破坏内存。控制 rogue（恶意）或已受控的同伴服务器的攻击者，可发送长度超过 KILLLEN 限制的理由，从而溢出一个静态的 512 字节缓冲区，导致 IRC 服务器崩溃，甚至可能实现远程代码执行。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
solanum-ircd solanum < 2ea1382e4262b212a91034258c466f0f6754cd61 affected
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I. Basic Information for CVE-2026-121603

Vulnerability Information
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Vulnerability Title
Solanum before commit 2ea1382 Buffer Overflow via Server-to-Server KILL Handler
Source: CVE Program / CVE List V5
Vulnerability Description
Solanum before commit 2ea1382 contains a buffer overflow vulnerability in ms_kill() that allows malicious linked servers to corrupt memory by sending an overlong kill reason. Attackers controlling a rogue or compromised peer server can send a reason exceeding KILLLEN that overflows a static 512-byte buffer, crashing the ircd or potentially achieving remote code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
solanum-ircd solanum 0 ~ 2ea1382e4262b212a91034258c466f0f6754cd61 -

II. Public POCs for CVE-2026-121603

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-121603

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Other References for CVE-2026-121603 (5)

IV. Related Vulnerabilities

Same product: solanum
Same vendor: solanum-ircd
Same weakness: CWE-120