medium5.3
CVE-2026-106116
ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop
Impact
ImageSharp is a 2D graphics library. From 2.0.0 until 4.1.2, ExifReader.ReadValues64 trusts the 64-bit BigTIFF IFD entry count and iterates once per declared entry. When fewer than 20 bytes remain, ExifReader.ReadValue64 returns without advancing the stream or terminating the outer loop, so a small malformed BigTIFF can keep one decoder thread executing for an attacker-controlled duration. This report does not claim worker-pool exhaustion. This issue is fixed in version 4.1.2.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | SixLabors.ImageSharp | >= 2.0.0, < 3.2.0 | 3.2.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Sixlabors | Imagesharp | from 2.0.0 before 3.2.0 from 4.0.0 before 4.1.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-wmxv-xphr-5c9g
- https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-wmxv-xphr-5c9g
- https://nvd.nist.gov/vuln/detail/CVE-2026-106116
- https://github.com/SixLabors/ImageSharp/pull/3187
- https://github.com/SixLabors/ImageSharp/commit/92b12d72550ebb6be5b1e22e559c361fd863a6ec
- https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2
- https://github.com/SixLabors/ImageSharp/pull/3208
- https://github.com/SixLabors/ImageSharp/commit/baa37cd19077b2a2a0c5667535111cf31d48c019
- https://github.com/SixLabors/ImageSharp/releases/tag/v3.2.0