OpenZeppelin Contracts Bytes's lastIndexOf function with position argument performs out-of-bound memory access on empty buffers
Impact
The lastIndexOf(bytes,byte,uint256) function of the Bytes.sol library may access uninitialized memory when the following two conditions hold: 1) the provided buffer length is empty (i.e. buffer.length == 0) and position is not 2**256 - 1 (i.e. pos != type(uint256).max).
The pos argument could be used to access arbitrary data outside of the buffer bounds. This could lead to the operation running out of gas, or returning an invalid index (outside of the empty buffer). Processing this invalid result for accessing the buffer would cause a revert under normal conditions.
When triggered, the function reads memory at offset buffer + 0x20 + pos. If memory at that location (outside the buffer) matches the search pattern, the function would return an out of bound index instead of the expected type(uint256).max. This creates unexpected behavior where callers receive a valid-looking index pointing outside buffer bounds.
Subsequent memory accesses that don't check bounds and use the returned index must carefully review the potential impact depending on their setup. Code relying on this function returning type(uint256).max for empty buffers or using the returned index without bounds checking could exhibit undefined behavior.
Patches
Upgrade to 5.4.0
Software afectado
Haz clic en una tecnología para ver todas sus vulnerabilidades.
| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | @openzeppelin/contracts | >= 5.2.0, < 5.4.0 | 5.4.0 |
| Paquete de npm | @openzeppelin/contracts-upgradeable | >= 5.2.0, < 5.4.0 | 5.4.0 |
Referencias
- https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-9rcw-c2f9-2j55
- https://nvd.nist.gov/vuln/detail/CVE-2025-54070
- https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5797
- https://github.com/OpenZeppelin/openzeppelin-contracts
- https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v5.4.0
- Vector CVSS
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:N- Debilidad (CWE)
CWE-125- Plataforma
- npm
- Paquete
@openzeppelin/contracts, @openzeppelin/contracts-upgradeable- Publicada
- 17.07.2025
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-9rcw-c2f9-2j55 - CC BY 4.0
Historial de vulnerabilidades: @openzeppelin/contracts-upgradeable
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 22
- Primera → última
- 08.2021 07.2025
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 3
- Alta 5
- Media 12
- Baja 2
Divulgaciones por año
- 2021: 5
- 2022: 8
- 2023: 7
- 2024: 1
- 2025: 1
- 2026: 0
-
OpenZeppelin Contracts Bytes's lastIndexOf function with position argument performs out-of-bound memory access on empty buffers esta entrada
Identifica las vulnerabilidades de tu aplicación
Con la integración de DockRay y el inventario de software activado, DockRay compara las versiones notificadas de los componentes con las vulnerabilidades conocidas y avisa de las coincidencias confirmadas. La cobertura depende de la tecnología compatible y de los avisos disponibles.