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

Quick assessment

Affected
solana-foundation anchor
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 8.2 · High EPSS 0.28% · P21

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
solana-foundation anchor >= 1.0.0, < 1.0.2 affected
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I. Basic Information for CVE-2026-45137

Vulnerability Information
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Vulnerability Title
Anchor: Program<'info, System> is not properly validated
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Anchor 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
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
solana-foundation anchor >= 1.0.0, < 1.0.2 -

II. Public POCs for CVE-2026-45137

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 16529 chars
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III. Intelligence Information for CVE-2026-45137

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Vendor Advisories for CVE-2026-45137 (1)

IV. Related Vulnerabilities

Same product: anchor
Same weakness: CWE-20