CVE-2023-34449

MEDIUM 5.3CVE-2023-34449 · Published 14/06/2023 · updated 17/06/2026

In short

CVE-2023-34449 is a MEDIUM (CVSS 5.3) vulnerability affecting ink! (parity).
Chance of exploitation in the next 30 days (EPSS): 0.97%, higher than 61.8% of all vulnerabilities.
Fix: update to 4.2.1 or later.

Package	Affected versions	Patched versions
ink! parity	`≥ 4.0.0, < 4.2.1`	`4.2.1`

Description

ink! is an embedded domain specific language to write smart contracts in Rust for blockchains built on the Substrate framework. Starting in version 4.0.0 and prior to version 4.2.1, the return value when using delegate call mechanics, either through `CallBuilder::delegate` or `ink_env::invoke_contract_delegate`, is decoded incorrectly. This bug was related to the mechanics around decoding a call's return buffer, which was changed as part of pull request 1450. Since this feature was only released in ink! 4.0.0, no previous versions are affected. Users who have an ink! 4.x series contract should upgrade to 4.2.1 to receive a patch.

References

docs.rs/ink_env/4.2.0/ink_env/call/struct.CallBuilder.html · Exploit
docs.rs/ink_env/4.2.0/ink_env/fn.invoke_contract_delegate.html · Exploit
paritytech/ink commit f1407ee · Patch
paritytech/ink#1450 · Patch
paritytech/ink security advisory · Exploit

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