CVE-2026-41991: Software Security Vulnerability Vulnerability

LOW
Advisory Identifier: GHSA-67v8-88jf-4x6q
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CVSS 4.7
CWE-377
Published
Advisory Summary

CVE-2026-41991 is a LOW (CVSS 4.7) security vulnerability vulnerability (CWE-377: Insecure Temporary File) affecting Software libraries in the Maven ecosystem. The weakness occurs when creating and using insecure temporary files can leave application and system data vulnerable to attack.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-41991 at a Glance

CVE Identifier CVE-2026-41991
GHSA Identifier GHSA-67v8-88jf-4x6q
Severity LOW
CVSS v3.1 Base Score 4.7
CWE Classification CWE-377: Insecure Temporary File
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.7

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

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

How to Fix CVE-2026-41991

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-2026-41991, 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-377: Insecure Temporary File, where creating and using insecure temporary files can leave application and system data vulnerable to attack. 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

GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user’s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks. A local attacker can pre‑create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time‑of‑check to time‑of‑use (TOCTOU) condition that allows arbitrary file overwrite. This issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269

References

NVD — CVE-2026-41991 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41991
cert.pl/en/posts/2026/04/cv... WEB
https://cert.pl/en/posts/2026/04/CVE-2026-41991
cgit.git.savannah.gnu.org/cgit/gzip.git/commi... WEB
https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=4e6f8b24ab823146ab8776f0b7fe486ab34d4269
www.gnu.org/software/gzip WEB
https://www.gnu.org/software/gzip

Frequently Asked Questions

What is CVE-2026-41991?
CVE-2026-41991 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-377: Insecure Temporary File.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-41991?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-41991?
CVE-2026-41991 has a CVSS v3.1 base score of 4.7 (LOW) with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2026-41991?
CVE-2026-41991 is classified under CWE-377: Insecure Temporary File (Creating and using insecure temporary files can leave application and system data vulnerable to attack.).
How can I check Maven dependencies for CVE-2026-41991?
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-67v8-88jf-4x6q",
  "modified" : "2026-07-01T15:34:56Z",
  "published" : "2026-06-29T12:31:44Z",
  "aliases" : [ "CVE-2026-41991" ],
  "details" : "GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user’s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks.\nA local attacker can pre‑create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time‑of‑check to time‑of‑use (TOCTOU) condition that allows arbitrary file overwrite.\n\nThis issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/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-2026-41991"
  }, {
    "type" : "WEB",
    "url" : "https://cert.pl/en/posts/2026/04/CVE-2026-41991"
  }, {
    "type" : "WEB",
    "url" : "https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=4e6f8b24ab823146ab8776f0b7fe486ab34d4269"
  }, {
    "type" : "WEB",
    "url" : "https://www.gnu.org/software/gzip"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-377" ],
    "severity" : "LOW",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-29T12:16:29Z"
  }
}