CVE-2025-54575: SixLabors.ImageSharp SixLabors ImageSharp Has Infinite Loop Vulnerability

MODERATE
Advisory Identifier: GHSA-rxmq-m78w-7wmc
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CVSS 5.3
CWE-400 CWE-770
Published
Advisory Summary

CVE-2025-54575 is a MODERATE (CVSS 5.3) sixlabors imagesharp has infinite loop vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting SixLabors.ImageSharp libraries in the NuGet ecosystem. The issue involves sixlabors imagesharp has infinite loop in gif decoder when skipping malformed comment extension blocks. Remediation is available by upgrading affected packages to version 2.1.11, 3.1.11.

CVE-2025-54575 at a Glance

CVE Identifier CVE-2025-54575
GHSA Identifier GHSA-rxmq-m78w-7wmc
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product SixLabors.ImageSharp
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2025-54575

To remediate this vulnerability, upgrade all affected SixLabors.ImageSharp dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

SixLabors.ImageSharp fixed: 2.1.11 
Upgrade SixLabors.ImageSharp to 2.1.11
SixLabors.ImageSharp fixed: 3.1.11 
Upgrade SixLabors.ImageSharp to 3.1.11
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for SixLabors.ImageSharp

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-54575, inspect your project dependencies for SixLabors.ImageSharp:

inspect dependencies for SixLabors.ImageSharp

Analyze the terminal output to locate any version of SixLabors.ImageSharp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.1.11), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In SixLabors.ImageSharp, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact A specially crafted GIF file containing a malformed comment extension block (with a missing block terminator) can cause the ImageSharp GIF decoder to enter an infinite loop while attempting to skip the block. This leads to a denial of service. Applications processing untrusted GIF input should upgrade to a patched version. ### Patches The problem has been patched. All users are advised to upgrade to v3.1.11 or v2.1.11. ### Workarounds None.

CVE-2025-54575 Affected SixLabors.ImageSharp Versions

2 component(s)
Fixed Versions:
2.1.113.1.11
Product / Package Ecosystem Affected Versions Fixed Version
SixLabors.ImageSharp
nuget/SixLabors.ImageSharp
NuGet
< 2.1.11
2.1.11
SixLabors.ImageSharp
nuget/SixLabors.ImageSharp
NuGet
≥ 3.0.0
< 3.1.11
3.1.11

References

GitHub Advisory / Wiki ADVISORY
https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-rxmq-m78w-7wmc
NVD — CVE-2025-54575 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-54575
SixLabors.ImageSharp Source Repository REPOSITORY
https://github.com/SixLabors/ImageSharp/issues/2953
Security Fix Commit FIX COMMIT
https://github.com/SixLabors/ImageSharp/commit/55e49262df9a057dff9b7807ed1b7bdb49187c3f
Security Fix Commit FIX COMMIT
https://github.com/SixLabors/ImageSharp/commit/833f3ceec35af6b775950e06f03b934546cefbf6
SixLabors.ImageSharp Source Repository REPOSITORY
https://github.com/SixLabors/ImageSharp

Frequently Asked Questions

What is CVE-2025-54575?
CVE-2025-54575 is a security vulnerability in SixLabors.ImageSharp involving SixLabors ImageSharp Has Infinite Loop in GIF Decoder When Skipping Malformed Comment Extension Blocks under CWE-400: Uncontrolled Resource Consumption.
Which SixLabors.ImageSharp versions are affected?
Affected versions include releases prior to 2.1.11, 3.1.11 across affected packages: SixLabors.ImageSharp.
What version fixes CVE-2025-54575?
Upgrading to 2.1.11, 3.1.11 (or the latest patched release for your respective branch) resolves the vulnerability.
Is SixLabors.ImageSharp affected?
Yes, SixLabors.ImageSharp is affected in releases prior to 2.1.11, 3.1.11. Upgrade your dependency to 2.1.11, 3.1.11 or later.
What is the CVSS score of CVE-2025-54575?
CVE-2025-54575 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2025-54575?
CVE-2025-54575 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check NuGet dependencies for CVE-2025-54575?
Run the dependency tree command: 'inspect dependencies for SixLabors.ImageSharp'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-rxmq-m78w-7wmc",
  "modified" : "2025-07-31T11:18:16Z",
  "published" : "2025-07-30T13:23:01Z",
  "aliases" : [ "CVE-2025-54575" ],
  "summary" : "SixLabors ImageSharp Has Infinite Loop in GIF Decoder When Skipping Malformed Comment Extension Blocks",
  "details" : "### Impact\nA specially crafted GIF file containing a malformed comment extension block (with a missing block terminator) can cause the ImageSharp GIF decoder to enter an infinite loop while attempting to skip the block. This leads to a denial of service. Applications processing untrusted GIF input should upgrade to a patched version.\n\n### Patches\nThe problem has been patched. All users are advised to upgrade to v3.1.11 or v2.1.11.\n\n### Workarounds\nNone.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "SixLabors.ImageSharp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.1.11"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "SixLabors.ImageSharp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.1.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-rxmq-m78w-7wmc"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-54575"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/SixLabors/ImageSharp/issues/2953"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/SixLabors/ImageSharp/commit/55e49262df9a057dff9b7807ed1b7bdb49187c3f"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/SixLabors/ImageSharp/commit/833f3ceec35af6b775950e06f03b934546cefbf6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/SixLabors/ImageSharp"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-770" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-07-30T13:23:01Z",
    "nvd_published_at" : "2025-07-30T20:15:37Z"
  }
}