NULL Pointer Dereference in ELFIO Affects Applications from Sergei's ELFIO
CVE-2026-110659

6.8MEDIUM

Key Information:

Vendor

Serge1

Status
Elfio
Vendor
CVE Published:
14 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-110659?

The ELFIO library, up to version 3.12, contains a vulnerability that allows attackers to exploit a NULL pointer dereference through the relocation_section_accessor's get_entry() function. By sending a specially crafted ELF file with an unvalidated sh_link index, an attacker can cause affected applications to crash, leading to a denial of service. The vulnerability arises when the SHT_REL or SHT_RELA sections contain a dangling sh_link, causing an attempt to dereference a null pointer during operation. Developers and users of ELFIO should take precautions and update their implementations accordingly.

Affected Version(s)

ELFIO 0 <= 3.12

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-110659 - Proof of Concept

References

https://hackmd.io/@haind-pwn/elfio-relocation-get-entry-n...
technical-descriptionexploit
https://github.com/serge1/ELFIO/blob/8ae6cec5d60495822ecd...
technical-description
https://github.com/serge1/ELFIO
product

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

HaiND from the Post and Telecommunication Institute of Technology
.