CVE-2026-33809: Golang.org/x/image Go Images Vulnerable To An Vulnerability

MODERATE
Advisory Identifier: GHSA-44p7-9xx4-hf2g
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CVSS 5.3
CWE-434 CWE-770
Published
Advisory Summary

CVE-2026-33809 is a MODERATE (CVSS 5.3) go images vulnerable to an vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Golang.org/x/image libraries in the Go ecosystem. The issue involves go images vulnerable to an out-of-memory error via a crafted tiff file. Remediation is available by upgrading affected packages to version 0.38.0.

CVE-2026-33809 at a Glance

CVE Identifier CVE-2026-33809
GHSA Identifier GHSA-44p7-9xx4-hf2g
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Golang.org/x/image
Package Ecosystem Go
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:L/I:N/A:N).

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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-33809

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

golang.org/x/image fixed: 0.38.0 
Upgrade golang.org/x/image to 0.38.0
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 golang.org/x/image

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-33809, inspect your project dependencies for Golang.org/x/image:

inspect dependencies for golang.org/x/image

Analyze the terminal output to locate any version of Golang.org/x/image in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.38.0), 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-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In Golang.org/x/image, 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

A maliciously crafted TIFF file can cause image decoding to attempt to allocate up 4GiB of memory, causing either excessive resource consumption or an out-of-memory error.

CVE-2026-33809 Affected Golang.org/x/image Versions

1 component(s)
Fixed Versions:
0.38.0
Product / Package Ecosystem Affected Versions Fixed Version
golang.org/x/image
golang/golang.org/x/image
Go
< 0.38.0
0.38.0

References

pkg.go.dev/vuln/go-2026-4815 WEB
https://pkg.go.dev/vuln/GO-2026-4815
NVD — CVE-2026-33809 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33809
cs.opensource.google/go/x/image PACKAGE
https://cs.opensource.google/go/x/image
go.dev/cl/757660 WEB
https://go.dev/cl/757660
go.dev/issue/78267 WEB
https://go.dev/issue/78267

Frequently Asked Questions

What is CVE-2026-33809?
CVE-2026-33809 is a security vulnerability in Golang.org/x/image involving Go Images vulnerable to an out-of-memory error via a crafted TIFF file under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Golang.org/x/image versions are affected?
Affected versions include releases prior to 0.38.0 across affected packages: golang.org/x/image.
What version fixes CVE-2026-33809?
Upgrading to 0.38.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is golang.org/x/image affected?
Yes, golang.org/x/image is affected in releases prior to 0.38.0. Upgrade your dependency to 0.38.0 or later.
What is the CVSS score of CVE-2026-33809?
CVE-2026-33809 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:L/I:N/A:N.
What CWE is associated with CVE-2026-33809?
CVE-2026-33809 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check Go dependencies for CVE-2026-33809?
Run the dependency tree command: 'inspect dependencies for golang.org/x/image'. 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-44p7-9xx4-hf2g",
  "modified" : "2026-03-30T16:11:31Z",
  "published" : "2026-03-25T21:30:35Z",
  "aliases" : [ "CVE-2026-33809" ],
  "summary" : "Go Images vulnerable to an out-of-memory error via a crafted TIFF file",
  "details" : "A maliciously crafted TIFF file can cause image decoding to attempt to allocate up 4GiB of memory, causing either excessive resource consumption or an out-of-memory error.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "golang.org/x/image"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.38.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33809"
  }, {
    "type" : "PACKAGE",
    "url" : "https://cs.opensource.google/go/x/image"
  }, {
    "type" : "WEB",
    "url" : "https://go.dev/cl/757660"
  }, {
    "type" : "WEB",
    "url" : "https://go.dev/issue/78267"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2026-4815"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434", "CWE-770" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-30T16:11:31Z",
    "nvd_published_at" : "2026-03-25T19:16:51Z"
  }
}