What is heap buffer overflow?
Heap buffer overflow is a type of attack where an attacker attempts to write or read data beyond the boundaries of a buffer allocated on the heap memory.
Azərbaycanca: Heap buffer overflow hücumu yaddaşda müəyyən edilmiş buferin hüdudlarından kənara çıxaraq verilənləri yazmaq və ya oxumaq üçün edilən bir hücum növüdür.
How it works
During a heap buffer overflow attack, an attacker tries to overflow the buffer allocated in the memory, causing the program to exhibit unexpected behavior, potentially leading to security vulnerabilities or even program crashes.
Defense checklist5
- 01
Input validation and secure coding practices
- 02
Bounds checking for memory buffers and ensuring safe write operations
- 03
Timely application of security updates and patches
- 04
Security review and audit of code
- 05
Implementation of EDR (Endpoint Detection and Response) solutions
Real-world evidence
Incidents such as CVE-2026-16554 (cJSON library), CVE-2026-51260 (schreibfaul1 ESP32-audioI2S), CVE-2026-67191 (Xlight FTP Server), CVE-2026-67298 (FreeRDP), CVE-2026-44605 (RPM Package Manager), CVE-2026-18497 (nothings stb TrueType library), CVE-2026-74452 (Linux kernel), and CVE-2026-68765 (hashcat) are examples of heap buffer overflow attacks.
Sources
- CVE-2026-16554: cJSON library is vulnerable to an integer overflow in the print_string_ptr() function in cnvd
- CVE-2026-51260: Unsafe fixed-size memcpy operation in AudioBuffer::writeSpace() of schreibfaul1 ESP32-audinvd
- CVE-2026-67191: Xlight FTP Server before 3.9.5 contains a pre-authentication heap buffer overflow vulnerabnvd
- CVE-2026-67298: FreeRDP versions 3.28.0 and earlier contain a heap buffer overflow in the server-side RAILnvd
- CVE-2026-44605: A flaw was found in the RPM Package Manager (RPM). A local user could be affected by a heanvd
- CVE-2026-18497: A heap-buffer-overflow vulnerability exists in the nothings stb TrueType library, up to venvd
- CVE-2026-74452: In the Linux kernel, the following vulnerability has been resolved: drm/panthor: reject fnvd
- CVE-2026-68765: hashcat master branch builds after v7.1.2 contain a heap buffer overflow vulnerability innvd
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.