Heap-based Buffer Overflow in IrfanView's TIFF Wang Annotation Handler
CVE-2026-121517

2.3LOW

Key Information:

Vendor

IrfanView
Status
Irfanview
Vendor
CVE Published:
3 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121517?

A heap-based buffer overflow vulnerability has been identified in IrfanView version 4.76.0.0 specifically affecting the TIFF Wang Annotation Handler component. This vulnerability allows for potential manipulation that can be exploited remotely, although achieving successful exploitation is complex and may require advanced capabilities. Despite the potential risk, the TIF-Annotations option is disabled by default, which minimizes the impact on typical users. To safeguard against this issue, applying the recommended patch is essential.

Affected Version(s)

IrfanView 4.76.0.0

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-2026-121517 - Proof of Concept

References

https://vuldb.com/vuln/430288
vdb-entry
https://vuldb.com/vuln/430288/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-121517
third-party-advisory

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

dwbruijn (VulDB User)
VulDB CNA Team
.