CVE-2025-27598: SixLabors.ImageSharp Out-of-bounds Write Vulnerability

HIGH
Advisory Identifier: GHSA-2cmq-823j-5qj8
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CVSS 7.5
CWE-787
Published
Advisory Summary

CVE-2025-27598 is a HIGH (CVSS 7.5) out-of-bounds write vulnerability (CWE-787: Out-of-bounds Write) affecting SixLabors.ImageSharp libraries in the NuGet ecosystem. The issue involves out-of-bounds write in sixlabors imagesharp. Remediation is available by upgrading affected packages to version 3.1.7, 2.1.10.

CVE-2025-27598 at a Glance

CVE Identifier CVE-2025-27598
GHSA Identifier GHSA-2cmq-823j-5qj8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-787: Out-of-bounds Write
Affected Product SixLabors.ImageSharp
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:H).

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 High (A:H)

How to Fix CVE-2025-27598

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: 3.1.7 
Upgrade SixLabors.ImageSharp to 3.1.7
SixLabors.ImageSharp fixed: 2.1.10 
Upgrade SixLabors.ImageSharp to 2.1.10
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-2025-27598, 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 3.1.7), 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-787: Out-of-bounds Write, where the product writes data past the end, or before the beginning, of the intended buffer. 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 An Out-of-bounds Write vulnerability has been found in the ImageSharp gif decoder, allowing attackers to cause a crash using a specially crafted gif. This can potentially lead to denial of service. ### Patches The problem has been patched. All users are advised to upgrade to v3.1.7 or v2.1.10. ### Workarounds None. ### References https://github.com/SixLabors/ImageSharp/issues/2859 https://github.com/SixLabors/ImageSharp/issues/2890

CVE-2025-27598 Affected SixLabors.ImageSharp Versions

2 component(s)
Fixed Versions:
3.1.72.1.10
Product / Package Ecosystem Affected Versions Fixed Version
SixLabors.ImageSharp
nuget/SixLabors.ImageSharp
NuGet
≥ 3.0.0
< 3.1.7
3.1.7
SixLabors.ImageSharp
nuget/SixLabors.ImageSharp
NuGet
< 2.1.10
2.1.10

References

GitHub Advisory / Wiki ADVISORY
https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-2cmq-823j-5qj8
NVD — CVE-2025-27598 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-27598
SixLabors.ImageSharp Source Repository REPOSITORY
https://github.com/SixLabors/ImageSharp/issues/2859
SixLabors.ImageSharp Source Repository REPOSITORY
https://github.com/SixLabors/ImageSharp/pull/2890
SixLabors.ImageSharp Source Repository REPOSITORY
https://github.com/SixLabors/ImageSharp

Frequently Asked Questions

What is CVE-2025-27598?
CVE-2025-27598 is a security vulnerability in SixLabors.ImageSharp involving Out-of-bounds Write in SixLabors ImageSharp under CWE-787: Out-of-bounds Write.
Which SixLabors.ImageSharp versions are affected?
Affected versions include releases prior to 3.1.7, 2.1.10 across affected packages: SixLabors.ImageSharp.
What version fixes CVE-2025-27598?
Upgrading to 3.1.7, 2.1.10 (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 3.1.7, 2.1.10. Upgrade your dependency to 3.1.7, 2.1.10 or later.
What is the CVSS score of CVE-2025-27598?
CVE-2025-27598 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2025-27598?
CVE-2025-27598 is classified under CWE-787: Out-of-bounds Write (The product writes data past the end, or before the beginning, of the intended buffer.).
How can I check NuGet dependencies for CVE-2025-27598?
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-2cmq-823j-5qj8",
  "modified" : "2025-03-07T13:45:22Z",
  "published" : "2025-03-06T22:23:48Z",
  "aliases" : [ "CVE-2025-27598" ],
  "summary" : "Out-of-bounds Write in SixLabors ImageSharp",
  "details" : "### Impact\nAn Out-of-bounds Write vulnerability has been found in the ImageSharp gif decoder, allowing attackers to cause a crash using a specially crafted gif. This can potentially lead to denial of service.\n\n### Patches\nThe problem has been patched. All users are advised to upgrade to v3.1.7 or v2.1.10.\n\n### Workarounds\nNone.\n\n### References\nhttps://github.com/SixLabors/ImageSharp/issues/2859\nhttps://github.com/SixLabors/ImageSharp/issues/2890",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "SixLabors.ImageSharp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.1.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "SixLabors.ImageSharp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.1.10"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-2cmq-823j-5qj8"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-27598"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/SixLabors/ImageSharp/issues/2859"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/SixLabors/ImageSharp/pull/2890"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/SixLabors/ImageSharp"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-03-06T22:23:48Z",
    "nvd_published_at" : "2025-03-06T23:15:12Z"
  }
}