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0xCERT Security Advisory 0xCERT-2026-0198
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Advisory-ID:  0xCERT-2026-0198
Severity:     High
Published:    2026-05-13T15:33:46.000Z
Updated:      2026-10-08T22:47:31.224Z
Chains:       Solana
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0198

Title: Anchor: `InterfaceAccount` allows account substitution between unexpected types

Summary
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Anchor: `InterfaceAccount` allows account substitution between unexpected types. Any uses of InterfaceAccount allows another unexpected account type to be passed, after https://github.com/solana-foundation/anchor/pull/3837 disabled discriminator checking for this type.

Details
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Summary
Any uses of InterfaceAccount allows another unexpected account type to be passed, after https://github.com/solana-foundation/anchor/pull/3837 disabled discriminator checking for this type.

Affected
- - anchor-lang (rust) = 1.0.0-rc.1 — fixed in 1.0.0-rc.2

Severity
High (CVSS 8.7), as rated by the upstream advisory.

Recommended actions
- - Upgrade anchor-lang to 1.0.0-rc.2 or later

Source & attribution
This 0xCERT advisory summarises GHSA-429q-fhh4-r6hj from the GitHub Advisory Database, credited upstream to acheroncrypto: https://github.com/advisories/GHSA-429q-fhh4-r6hj. Details may change; refer to the original source for the authoritative record.

References
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- - https://github.com/advisories/GHSA-429q-fhh4-r6hj
- - https://github.com/solana-foundation/anchor/security/advisories/GHSA-429q-fhh4-r6hj
- - https://github.com/solana-foundation/anchor/pull/3837
- - https://github.com/solana-foundation/anchor/pull/4139
- - https://github.com/solana-foundation/anchor/commit/26ef36968a62e28a1f028e7adae4806af30c747d
- - https://github.com/otter-sec/anchor/security/advisories/GHSA-429q-fhh4-r6hj
- - https://rustsec.org/advisories/RUSTSEC-2026-0146.html

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