CVE-2026-82556: Software Security Vulnerability Vulnerability

LOW
Advisory Identifier: GHSA-qcr2-8wjw-w786
Share
CVSS 6.3
CWE-918
Published
Advisory Summary

CVE-2026-82556 is a LOW (CVSS 6.3) security vulnerability vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Software libraries in the Maven ecosystem. The weakness occurs when the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-82556 at a Glance

CVE Identifier CVE-2026-82556
GHSA Identifier GHSA-qcr2-8wjw-w786
Severity LOW
CVSS v3.1 Base Score 6.3
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.3

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

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

How to Fix CVE-2026-82556

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

Verify Direct and Transitive Dependencies

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

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-82556, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

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

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Software, 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 vulnerability was found in Forgejo up to 15.0.4. This issue affects the function net.LookupIP of the file services/migrations/allowlist/is_migrate_allowed.go of the component Repository Migration Handler. Performing a manipulation results in server-side request forgery. The attack can be initiated remotely. The exploit has been made public and could be used. The patch is named b313bb83f5ff22bcc0378e0e0ca7bbd58303f168. It is recommended to apply a patch to fix this issue. The project maintainer explains: "I don't intend to backport this to v15 or v16 as it is a breaking change."

References

NVD — CVE-2026-82556 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82556
codeberg.org/forgejo/forgejo/com... WEB
https://codeberg.org/forgejo/forgejo/commit/b313bb83f5ff22bcc0378e0e0ca7bbd58303f168
codeberg.org/forgejo/forgejo/iss... WEB
https://codeberg.org/forgejo/forgejo/issues/13433
codeberg.org/forgejo/forgejo/pul... WEB
https://codeberg.org/forgejo/forgejo/pulls/13490
vuldb.com/cve/cve-2026-82556 WEB
https://vuldb.com/cve/CVE-2026-82556
vuldb.com/submit/891889 WEB
https://vuldb.com/submit/891889
vuldb.com/vuln/397072 WEB
https://vuldb.com/vuln/397072
vuldb.com/vuln/397072/cti WEB
https://vuldb.com/vuln/397072/cti

Frequently Asked Questions

What is CVE-2026-82556?
CVE-2026-82556 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-918: Server-Side Request Forgery (SSRF).
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-82556?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-82556?
CVE-2026-82556 has a CVSS v3.1 base score of 6.3 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-82556?
CVE-2026-82556 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Maven dependencies for CVE-2026-82556?
Run the dependency tree command: 'mvn dependency:tree'. 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-qcr2-8wjw-w786",
  "modified" : "2026-08-30T18:33:54Z",
  "published" : "2026-08-30T18:33:54Z",
  "aliases" : [ "CVE-2026-82556" ],
  "details" : "A vulnerability was found in Forgejo up to 15.0.4. This issue affects the function net.LookupIP of the file services/migrations/allowlist/is_migrate_allowed.go of the component Repository Migration Handler. Performing a manipulation results in server-side request forgery. The attack can be initiated remotely. The exploit has been made public and could be used. The patch is named b313bb83f5ff22bcc0378e0e0ca7bbd58303f168. It is recommended to apply a patch to fix this issue. The project maintainer explains: \"I don't intend to backport this to v15 or v16 as it is a breaking change.\"",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-82556"
  }, {
    "type" : "WEB",
    "url" : "https://codeberg.org/forgejo/forgejo/commit/b313bb83f5ff22bcc0378e0e0ca7bbd58303f168"
  }, {
    "type" : "WEB",
    "url" : "https://codeberg.org/forgejo/forgejo/issues/13433"
  }, {
    "type" : "WEB",
    "url" : "https://codeberg.org/forgejo/forgejo/pulls/13490"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-82556"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/891889"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/397072"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/397072/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "LOW",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-30T18:17:00Z"
  }
}