Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

CVE-2026-106116ImageSharp: BigTIFF IFD count can keep a decoder thread in a non-progressing loop

Medium 5.3

In plain English

A medium-severity infinite loop in ImageSharp from SixLabors. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 73.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
NuGet	sixlabors.imagesharp	3.2.0	GHSA-wmxv-xphr-5c9g
NuGet	sixlabors.imagesharp	4.1.2	GHSA-wmxv-xphr-5c9g

Affected products (as reported)

Vendor	Product	Versions
SixLabors	ImageSharp	>= 2.0.0, < 4.1.2

Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-wmxv-xphr-5c9g x_refsource_CONFIRM
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 x_refsource_MISC