solana-foundation anchor up to 1.0.1 CPI Call Pubkey::default comparison

Summaryinfo

A vulnerability labeled as critical has been found in solana-foundation anchor up to 1.0.1. Impacted is the function Pubkey::default of the component CPI Call Handler. The manipulation results in comparison. This vulnerability was named CVE-2026-45137. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in solana-foundation anchor up to 1.0.1. It has been classified as critical. Affected is the function Pubkey::default of the component CPI Call Handler. The manipulation with an unknown input leads to a comparison vulnerability. CWE is classifying the issue as CWE-697. The product compares two entities in a security-relevant context, but the comparison is incorrect, which may lead to resultant weaknesses. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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> implementation for Program, 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 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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-45137 since 05/08/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

Upgrading to version 1.0.2 eliminates this vulnerability.

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Productinfo

Vendor

• solana-foundation

Name

• anchor

Version

• 1.0.0
• 1.0.1

CPE 2.3info

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CPE 2.2info

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