Quick answers
- Is This vulnerability exploited in the wild?
- No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
- How severe is This vulnerability?
- High severity, with a CVSS score of 8.7, published 13 May 2026.
- Which products and versions are affected?
- anchor-lang (crates.io) = 1.0.0-rc.1; Solana Foundation Anchor 1.0.0-rc.1.
- Is there a fix for This vulnerability?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is This vulnerability attacked?
- It is attacked over the network, in a software library.
- Am I affected?
- Check whether you run anchor-lang (crates.io) or Solana Foundation Anchor at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A vulnerability exists in the `InterfaceAccount` type within the Anchor framework for Solana. The issue was introduced when discriminator checking— a mechanism used to verify that an account is of the expected type—was disabled for this specific component. An attacker can exploit this by passing an unexpected account type where an `InterfaceAccount` is required, leading to improper input validation (CWE-20). This allows for account substitution attacks that can compromise the integrity of smart contract state. The issue is fixed in version 1.0.0-rc.2 by re-enabling or correcting the validation logic.
Affected products
- solana-foundation anchor-lang 1.0.0-rc.1
Timeline
- 2026-05-08: disclosed: Vulnerability reported and fixed in pull request 4139
- 2026-05-13: advisory: GitHub Advisory GHSA-429q-fhh4-r6hj published