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Lightwell Security Advisory: junit 4.12.0.rhlw-00002

Type: advisorySources: OSV

Red Hat Lightwell has released junit:junit 4.12.0.rhlw-00002 with a backported security fix. CVE-2020-15250: In JUnit4 from version 4.7 and before 4.13.1, the test rule TemporaryFolder contains a local information disclosure vulnerability. On Unix like systems, the system's temporary directory is shared between all users on that system. Because of this, when files and directories are written into this directory they are, by default, readable by other users on that same system. This vulnerability does not allow other users to overwrite the contents of these directories or files. This is purely an information disclosure vulnerability. This vulnerability impacts you if the JUnit tests write sensitive information, like API keys or passwords, into the temporary folder, and the JUnit tests execute in an environment where the OS has other untrusted users. Because certain JDK file system APIs were only added in JDK 1.7, this this fix is dependent upon the version of the JDK you are using. For Java 1.7 and higher users: this vulnerability is fixed in 4.13.1. For Java 1.6 and lower users: no patch is available, you must use the workaround below. If you are unable to patch, or are stuck running on Java 1.6, specifying the `java.io.tmpdir` system environment variable to a directory that is exclusively owned by the executing user will fix this vulnerability. For more information, including an example of vulnerable code, see the referenced GitHub Security Advisory. This patched artifact is

Products
junit:junit
Affected versions
3.7, 3.8, 3.8.1, 3.8.2, 4.0, 4.1, 4.10, 4.11, 4.11-beta-1, 4.12, 4.12-beta-1, 4.12-beta-2, 4.12-beta-3, 4.12.0, 4.2, 4.3, 4.3.1, 4.4, 4.5, 4.6, 4.7, 4.8, 4.8.1, 4.8.2, 4.9
Fixed versions
4.12.0.rhlw-00002
CVEs
CVE-2020-15250
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 17:13 UTC · Revision 1

Source evidence

Lightwell Security Advisory: junit 4.12.0.rhlw-00002

core-osv · Original source

Published 9 Oct 2026, 18:05 UTC

Red Hat Lightwell has released junit:junit 4.12.0.rhlw-00002 with a backported security fix. CVE-2020-15250: In JUnit4 from version 4.7 and before 4.13.1, the test rule TemporaryFolder contains a local information disclosure vulnerability. On Unix like systems, the system's temporary directory is shared between all users on that system. Because of this, when files and directories are written into this directory they are, by default, readable by other users on that same system. This vulnerability does not allow other users to overwrite the contents of these directories or files. This is purely an information disclosure vulnerability. This vulnerability impacts you if the JUnit tests write sensitive information, like API keys or passwords, into the temporary folder, and the JUnit tests execute in an environment where the OS has other untrusted users. Because certain JDK file system APIs were only added in JDK 1.7, this this fix is dependent upon the version of the JDK you are using. For Java 1.7 and higher users: this vulnerability is fixed in 4.13.1. For Java 1.6 and lower users: no patch is available, you must use the workaround below. If you are unable to patch, or are stuck running on Java 1.6, specifying the `java.io.tmpdir` system environment variable to a directory that is exclusively owned by the executing user will fix this vulnerability. For more information, including an example of vulnerable code, see the referenced GitHub Security Advisory. This patched artifact is

osv:RHLW-2026-8de53cade32781fb

junit:junit

Fixed versions: 4.12.0.rhlw-00002

Complete source record
{
  "id": "ca1303a54030fb9f3f214f11234e358c40866b0f0d9a38b801ffbb6890067171",
  "url": "https://osv.dev/vulnerability/RHLW-2026-8de53cade32781fb",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Lightwell Security Advisory: junit 4.12.0.rhlw-00002",
    "summary": "Red Hat Lightwell has released junit:junit 4.12.0.rhlw-00002 with a backported security fix. CVE-2020-15250: In JUnit4 from version 4.7 and before 4.13.1, the test rule TemporaryFolder contains a local information disclosure vulnerability. On Unix like systems, the system's temporary directory is shared between all users on that system. Because of this, when files and directories are written into this directory they are, by default, readable by other users on that same system. This vulnerability does not allow other users to overwrite the contents of these directories or files. This is purely an information disclosure vulnerability. This vulnerability impacts you if the JUnit tests write sensitive information, like API keys or passwords, into the temporary folder, and the JUnit tests execute in an environment where the OS has other untrusted users. Because certain JDK file system APIs were only added in JDK 1.7, this this fix is dependent upon the version of the JDK you are using. For Java 1.7 and higher users: this vulnerability is fixed in 4.13.1. For Java 1.6 and lower users: no patch is available, you must use the workaround below. If you are unable to patch, or are stuck running on Java 1.6, specifying the `java.io.tmpdir` system environment variable to a directory that is exclusively owned by the executing user will fix this vulnerability. For more information, including an example of vulnerable code, see the referenced GitHub Security Advisory. This patched artifact is",
    "evidence": "osv:RHLW-2026-8de53cade32781fb",
    "products": [
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        "name": {
          "value": "junit:junit",
          "evidence": "/affected/0/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/0/ranges"
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        "affected_versions": [
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    "severity": "medium",
    "structured": {
      "id": "RHLW-2026-8de53cade32781fb",
      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
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              "events": [
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          "package": {
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            "lightwell": {
              "repository_url": "https://packages.redhat.com/lightwell/java/remediated/",
              "remediated_version": "4.12.0.rhlw-00002",
              "backport_base_version": "4.12.0"
            }
          }
        }
      ],
      "modified": "2026-10-27T04:00:11.942138592Z",
      "provider": "osv",
      "upstream": [
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        "GHSA-269g-pwp5-87pp"
      ],
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        "https://lists.apache.org/thread.html/r09cfbb5aedd76023691bbce9ca4ce2e16bb07dd37554a17efc19935d%40%3Cpluto-dev.portals.apache.org%3E",
        "https://lists.apache.org/thread.html/r1209986f79359b518d09513ff05a88e5b3c398540e775edea76a4774%40%3Cdev.knox.apache.org%3E",
        "https://lists.apache.org/thread.html/r29d703d1986d9b871466ff24082a1828ac8ad27bb0965a93a383872e%40%3Cpluto-scm.portals.apache.org%3E",
        "https://lists.apache.org/thread.html/r2b78f23bc2711a76a7fc73ad67b7fcd6817c5cfccefd6f30a4f54943%40%3Cdev.knox.apache.org%3E",
        "https://lists.apache.org/thread.html/r30f502d2f79e8d635361adb8108dcbb73095163fcbd776ee7984a094%40%3Ccommits.creadur.apache.org%3E",
        "https://lists.apache.org/thread.html/r500517c23200fb2fdb0b82770a62dd6c88b3521cfb01cfd0c76e3f8b%40%3Cdev.creadur.apache.org%3E",
        "https://lists.apache.org/thread.html/r5f8841507576f595bb783ccec6a7cb285ea90d4e6f5043eae0e61a41%40%3Cdev.creadur.apache.org%3E",
        "https://lists.apache.org/thread.html/r687f489b10b0d14e46f626aa88476545e1a2600b24c4ebd3c0d2a10b%40%3Cdev.knox.apache.org%3E",
        "https://lists.apache.org/thread.html/r717877028482c55acf604d7a0106af4ca05da4208c708fb157b53672%40%3Ccommits.creadur.apache.org%3E",
        "https://lists.apache.org/thread.html/r742b44fd75215fc75963b8ecc22b2e4372e68d67d3d859d2b5e8743f%40%3Cdev.knox.apache.org%3E",
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        "https://lists.apache.org/thread.html/r925eaae7dd8f77dd61eefc49c1fcf54bd9ecfe605486870d7b1e9390%40%3Cpluto-dev.portals.apache.org%3E",
        "https://lists.apache.org/thread.html/r934208a520b38f5cf0cae199b6b076bfe7d081809528b0eff2459e40%40%3Cdev.knox.apache.org%3E",
        "https://lists.apache.org/thread.html/r95f8ef60c4b3a5284b647bb3132cda08e6fadad888a66b84f49da0b0%40%3Ccommits.creadur.apache.org%3E",
        "https://lists.apache.org/thread.html/r9710067c7096b83cb6ae8f53a2f6f94e9c042d1bf1d6929f8f2a2b7a%40%3Ccommits.knox.apache.org%3E",
        "https://lists.apache.org/thread.html/ra1bdb9efae84794e8ffa2f8474be8290ba57830eefe9714b95da714b%40%3Cdev.pdfbox.apache.org%3E",
        "https://lists.apache.org/thread.html/raebf13f53cd5d23d990712e3d11c80da9a7bae94a6284050f148ed99%40%3Ccommits.pulsar.apache.org%3E",
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        "https://lists.apache.org/thread.html/rb33212dab7beccaf1ffef9b88610047c644f644c7a0ebdc44d77e381%40%3Ccommits.turbine.apache.org%3E",
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        "https://github.com/junit-team/junit4/blob/7852b90cfe1cea1e0cdaa19d490c83f0d8684b50/doc/ReleaseNotes4.13.1.md",
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  "source_id": "core-osv",
  "document_id": 460129,
  "published_at": "2026-10-09T18:05:40+00:00"
}