CVE-2026-121517
IrfanView TIFF Wang Annotation heap-based overflow
A vulnerability was detected in IrfanView 4.76.0.0 on Win64. Affected by this vulnerability is an unknown functionality of the component TIFF Wang Annotation Handler. Performing a manipulation results in heap-based buffer overflow. The attack is possible to be carried out remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit is now public and may be used. It is recommended to apply a patch to fix this issue. The vendor confirms: "[T]he TIF-Annotations option is OFF by default. Means, normal users are not affected ... the danger level for this is low".
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| IrfanView n/a |
4.76.0.0 (affected) | CNA: VulDB |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 2.3 low |
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P | CNA: VulDB |
| 3.1 / 5.0 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C | CNA: VulDB |
| 3.0 / 5.0 medium |
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C | CNA: VulDB |
| 2.0 / 5.1 medium |
AV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C | CNA: VulDB |
Exploit evidence
- https://github.com/dwBruijn/CVEs/blob/main/IrfanView/TIFF/Tiff_Wang.md
exploit · CNA: VulDB
References
- https://vuldb.com/vuln/430288CNA: VulDB · vdb-entry
- https://vuldb.com/vuln/430288/ctiCNA: VulDB · signature, permissions-required
- https://vuldb.com/cve/CVE-2026-121517CNA: VulDB · third-party-advisory
- https://vuldb.com/submit/1018543CNA: VulDB · third-party-advisory
- https://github.com/dwBruijn/CVEs/blob/main/IrfanView/TIFF/Tiff_Wang.mdCNA: VulDB · exploit
- https://www.irfanview.com/CNA: VulDB · product
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