TI-2024-14992 Aliases CVE-2024-22419 GHSA-2q8v-3gqq-4f8p

concat built-in can corrupt memory in vyper

HIGH 81CWE-120Published 2024-01-18 · Updated 2025-06-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-120 and the CVSS impact.

Summary

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine. The `concat` built-in can write over the bounds of the memory buffer that was allocated for it and thus overwrite existing valid data. The root cause is that the `build_IR` for `concat` doesn't properly adhere to the API of copy functions (for `>=0.3.2` the `copy_bytes` function). A contract search was performed and no vulnerable contracts were found in production. The buffer overflow can result in the change of semantics of the contract. The overflow is length-dependent and thus it might go unnoticed during contract testing. However, certainly not all usages of concat will result in overwritten valid data as we require it to be in an internal function and close to the return statement where other memory allocations don't occur. This issue has been addressed in 0.4.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0077 55th percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix Fixed vyper (vyperlang): 0.4.0vyper (PyPI): 0.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
vyperlang	vyper	before 0.4.0	0.4.0	Patch available	CNA
—	vyper (PyPI)	0.3.0 to before 0.4.0	0.4.0	Patch available	GHSA-2q8v-3gqq-4f8p

vyper Vendorvyperlang Affected before 0.4.0 Fixed in 0.4.0 Patch available CNA
vyper (PyPI) Vendor— Affected 0.3.0 to before 0.4.0 Fixed in 0.4.0 Patch available GHSA-2q8v-3gqq-4f8p

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:vyperlang:vyper::::::python::*	up to 0.3.10	Vulnerable	vyperlang

cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:python:*:* Versions up to 0.3.10 Vulnerable ·vyperlang

Remediation

Fix · CNA vyper (vyperlang) Fixed in 0.4.0
Fix · GHSA-2q8v-3gqq-4f8p vyper (PyPI) Fixed in 0.4.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2024-22419
2026-10-03 Alias added: GHSA-2q8v-3gqq-4f8p

References

Exploit 2

Patch 1

https://github.com/vyperlang/vyper/commit/55e18f6d128b2da8986adbbcccf1cd59a4b9ad6f

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2024-22419

Other 2

TI-2024-16182 Vyper bounds check on built-in `slice()` function can be overflowed CVSS 3.1CRITICAL 9.8
TI-2024-16184 Vyper array negative index vulnerability CVSS 3.1CRITICAL 9.8
TI-2022-08657 Integer bounds error in Vyper CVSS 3.1CRITICAL 9.8
TI-2022-11796 Multiple evaluation of contract address in call in vyper CVSS 3.1HIGH 8.2
TI-2024-21531 vyper performs double eval of the argument of sqrt CVSS 3.1MEDIUM 5.3
TI-2024-21527 vyper performs incorrect topic logging in raw_log CVSS 3.1MEDIUM 5.3

See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences