What is out-of-bounds write?
Out-of-bounds write is a security vulnerability that allows writing beyond the boundaries of a designated memory area.
Azərbaycanca: Out-of-bounds write zəifliyi təyin olunmuş sərbəst yaddaş sahəsinin hüdudlarından kənara çıxaraq yazmağa imkan verən bir təhlükəsizlik zəifliyidir.
How it works
This vulnerability occurs through specially crafted input data, allowing writing beyond the boundaries of a designated memory area. This can lead to arbitrary code execution, denial of service, or other security issues by an attacker.
Defense checklist5
- 01
Input validation and sanitization
- 02
Bounds checking for memory areas
- 03
Adherence to secure coding practices
- 04
Timely updates of software and libraries
- 05
Conducting security tests and audits
Real-world evidence
Real incidents such as CVE-2026-11645 (Google Chromium V8), CVE-2026-55737 (Erlang OTP), CVE-2026-18220 (GNU binutils BFD library), CVE-2026-20478 (Audio HAL), CVE-2026-24254 (NVIDIA Dynamo for Linux), CVE-2026-21072 (libsavsvc.so VC1 codec), CVE-2026-73514 (PostGIS address_standardizer extension) demonstrate the existence and potential danger of such vulnerabilities.
Sources
- [KEV] CVE-2026-11645: Google Chromium V8 Out-of-Bounds Read and Write Vulnerabilitycisa_kev
- CVE-2026-55737: Signed to Unsigned Conversion Error and Out-of-bounds Write vulnerability in Erlang OTP ernvd
- CVE-2026-18220: An out-of-bounds write vulnerability was found in the BFD library's DLX ELF backend (bfd/envd
- CVE-2026-20478: In Audio HAL, there is a possible out of bounds write due to a heap buffer overflow. Thisnvd
- CVE-2026-24254: NVIDIA Dynamo for Linux contains a vulnerability in the multimodal serving topology, wherenvd
- CVE-2026-21072: Improper input validation in VC1 codec in libsavsvc.so prior to SMR Aug-2026 Release 1 allnvd
- CVE-2026-73514: The address_standardizer extension for PostGIS through 3.7.0, fixed in commit 423570b, connvd
Other attack types
See also6
This guide is AI-written from the real incident sources skopnix collected — the examples above are drawn from those cited items, nothing is invented.