Medium severity · published Oct 6, 2026
CVE-2026-106116
ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop
5.3
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IM
ImageSharp · SixLabors
>= 2.0.0, < 4.1.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-106116
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-106116
x_refsource_CONFIRM
https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-wmxv-xphr-5c9g
x_refsource_MISC
https://github.com/SixLabors/ImageSharp/pull/3187
x_refsource_MISC
https://github.com/SixLabors/ImageSharp/commit/92b12d72550ebb6be5b1e22e559c361fd863a6ec
x_refsource_MISC
https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2
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