CVE-2026-45137— Anchor: Program<'info, System> is not properly validated

Anchor: Program<'info, System> is not properly validated

Anchor is a framework providing several convenient developer tools for writing Solana programs. From 1.0.0 to before 1.0.2, an logic error causes anchor programs to accept any program id when requiring the system program id, causing false assumptions resulting in potential arbitrary cpi in programs that invoke system program instructions. In the TryFrom<&'a AccountInfo<'a>> implementation for Program<'a, T>, the id of T is compared with Pubkey::default() to check whether anchor should allow any executable account, or a specific account, because when no T is supplied, T defaults to (), which implements Id::id() by returning Pubkey::default(). This results in T = () and T = System (which has Pubkey::default() as the id) having the same behavior, both allow any executable account. Programs built with anchor assume that the anchor runtime verifies passed in programs of type Program<'a, System> are in fact the system program. This false assumption can lead to arbitrary CPI or payment bypassing when programs try making CPI calls to the system program using the passed in system program due to the fact that the attacker can pass in any program instead of the system program. This vulnerability is fixed in 1.0.2.

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

输入验证不恰当

Anchor 输入验证错误漏洞

Anchor是OtterSec开源的一套轻量级博客系统。 Anchor 1.0.0版本至1.0.2之前版本存在输入验证错误漏洞，该漏洞源于Program类型实现中比较ID时使用Pubkey::default()导致系统程序ID接受任何程序ID，可能导致程序调用系统程序指令时出现任意CPI或支付绕过。

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