ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106116
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 18:16:53 UTC
Updated2026-10-06 20:03:40 UTC
DescriptionImageSharp 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem Types: CWE-835 | CWE-835 CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SixLabors ImageSharp affected >= 2.0.0, < 4.1.2 Not specified

References

ReferenceSourceLinkTags
github.com/SixLabors/ImageSharp/commit/92b12d72550ebb6be5b1e22e559c361fd... [email protected] github.com
github.com/SixLabors/ImageSharp/pull/3187 [email protected] github.com
github.com/SixLabors/ImageSharp/releases/tag/v4.1.2 [email protected] github.com
github.com/SixLabors/ImageSharp/security/advisories/GHSA-wmxv-xphr-5c9g 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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