CVE-2026-43046: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-rmq8-583w-4v2c
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CVSS 5.5
CWE-617
Published
Advisory Summary

CVE-2026-43046 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (CWE-617: Reachable Assertion) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43046 at a Glance

CVE Identifier CVE-2026-43046
GHSA Identifier GHSA-rmq8-583w-4v2c
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-617: Reachable Assertion
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.5

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

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2026-43046

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-2026-43046, 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-617: Reachable Assertion, where the product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. 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

In the Linux kernel, the following vulnerability has been resolved: btrfs: reject root items with drop_progress and zero drop_level [BUG] When recovering relocation at mount time, merge_reloc_root() and btrfs_drop_snapshot() both use BUG_ON(level == 0) to guard against an impossible state: a non-zero drop_progress combined with a zero drop_level in a root_item, which can be triggered: ------------[ cut here ]------------ kernel BUG at fs/btrfs/relocation.c:1545! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 283 ... Tainted: 6.18.0+ #16 PREEMPT(voluntary) Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: QEMU Ubuntu 24.04 PC v2, BIOS 1.16.3-debian-1.16.3-2 RIP: 0010:merge_reloc_root+0x1266/0x1650 fs/btrfs/relocation.c:1545 Code: ffff0000 00004589 d7e9acfa ffffe8a1 79bafebe 02000000 Call Trace: merge_reloc_roots+0x295/0x890 fs/btrfs/relocation.c:1861 btrfs_recover_relocation+0xd6e/0x11d0 fs/btrfs/relocation.c:4195 btrfs_start_pre_rw_mount+0xa4d/0x1810 fs/btrfs/disk-io.c:3130 open_ctree+0x5824/0x5fe0 fs/btrfs/disk-io.c:3640 btrfs_fill_super fs/btrfs/super.c:987 [inline] btrfs_get_tree_super fs/btrfs/super.c:1951 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2094 [inline] btrfs_get_tree+0x111c/0x2190 fs/btrfs/super.c:2128 vfs_get_tree+0x9a/0x370 fs/super.c:1758 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3642 [inline] do_new_mount fs/namespace.c:3718 [inline] path_mount+0x5b8/0x1ea0 fs/namespace.c:4028 do_mount fs/namespace.c:4041 [inline] __do_sys_mount fs/namespace.c:4229 [inline] __se_sys_mount fs/namespace.c:4206 [inline] __x64_sys_mount+0x282/0x320 fs/namespace.c:4206 ... RIP: 0033:0x7f969c9a8fde Code: 0f1f4000 48c7c2b0 fffffff7 d8648902 b8ffffff ffc3660f ---[ end trace 0000000000000000 ]--- The bug is reproducible on 7.0.0-rc2-next-20260310 with our dynamic metadata fuzzing tool that corrupts btrfs metadata at runtime. [CAUSE] A non-zero drop_progress.objectid means an interrupted btrfs_drop_snapshot() left a resume point on disk, and in that case drop_level must be greater than 0 because the checkpoint is only saved at internal node levels. Although this invariant is enforced when the kernel writes the root item, it is not validated when the root item is read back from disk. That allows on-disk corruption to provide an invalid state with drop_progress.objectid != 0 and drop_level == 0. When relocation recovery later processes such a root item, merge_reloc_root() reads drop_level and hits BUG_ON(level == 0). The same invalid metadata can also trigger the corresponding BUG_ON() in btrfs_drop_snapshot(). [FIX] Fix this by validating the root_item invariant in tree-checker when reading root items from disk: if drop_progress.objectid is non-zero, drop_level must also be non-zero. Reject such malformed metadata with -EUCLEAN before it reaches merge_reloc_root() or btrfs_drop_snapshot() and triggers the BUG_ON. After the fix, the same corruption is correctly rejected by tree-checker and the BUG_ON is no longer triggered.

References

NVD — CVE-2026-43046 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43046
git.kernel.org/stable/c/295f8075d0... WEB
https://git.kernel.org/stable/c/295f8075d00442d71dc9ccae421ace1c0d2d9224
git.kernel.org/stable/c/53ceedd1eb... WEB
https://git.kernel.org/stable/c/53ceedd1eb6280ca8359664e0226983eded2ed73
git.kernel.org/stable/c/850de3d87f... WEB
https://git.kernel.org/stable/c/850de3d87f4720b71ccdcd44f4aa57e46b53a3f3
git.kernel.org/stable/c/ac68a9a8e4... WEB
https://git.kernel.org/stable/c/ac68a9a8e481ab1becaed29d6d23087dac3de15d
git.kernel.org/stable/c/b17b79ff89... WEB
https://git.kernel.org/stable/c/b17b79ff896305fd74980a5f72afec370ee88ca4
git.kernel.org/stable/c/bedaf7d0b9... WEB
https://git.kernel.org/stable/c/bedaf7d0b9d793e116f16b4d9a7dbc94bcc80443
git.kernel.org/stable/c/de585ee18d... WEB
https://git.kernel.org/stable/c/de585ee18dd5601745f65a60fef7b7ceebd78c83

Frequently Asked Questions

What is CVE-2026-43046?
CVE-2026-43046 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-617: Reachable Assertion.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-43046?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-43046?
CVE-2026-43046 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-43046?
CVE-2026-43046 is classified under CWE-617: Reachable Assertion (The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.).
How can I check Maven dependencies for CVE-2026-43046?
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-rmq8-583w-4v2c",
  "modified" : "2026-05-08T15:31:15Z",
  "published" : "2026-05-01T15:30:37Z",
  "aliases" : [ "CVE-2026-43046" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: reject root items with drop_progress and zero drop_level\n\n[BUG]\nWhen recovering relocation at mount time, merge_reloc_root() and\nbtrfs_drop_snapshot() both use BUG_ON(level == 0) to guard against\nan impossible state: a non-zero drop_progress combined with a zero\ndrop_level in a root_item, which can be triggered:\n\n------------[ cut here ]------------\nkernel BUG at fs/btrfs/relocation.c:1545!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nCPU: 1 UID: 0 PID: 283 ... Tainted: 6.18.0+ #16 PREEMPT(voluntary)\nTainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE\nHardware name: QEMU Ubuntu 24.04 PC v2, BIOS 1.16.3-debian-1.16.3-2\nRIP: 0010:merge_reloc_root+0x1266/0x1650 fs/btrfs/relocation.c:1545\nCode: ffff0000 00004589 d7e9acfa ffffe8a1 79bafebe 02000000\nCall Trace:\n merge_reloc_roots+0x295/0x890 fs/btrfs/relocation.c:1861\n btrfs_recover_relocation+0xd6e/0x11d0 fs/btrfs/relocation.c:4195\n btrfs_start_pre_rw_mount+0xa4d/0x1810 fs/btrfs/disk-io.c:3130\n open_ctree+0x5824/0x5fe0 fs/btrfs/disk-io.c:3640\n btrfs_fill_super fs/btrfs/super.c:987 [inline]\n btrfs_get_tree_super fs/btrfs/super.c:1951 [inline]\n btrfs_get_tree_subvol fs/btrfs/super.c:2094 [inline]\n btrfs_get_tree+0x111c/0x2190 fs/btrfs/super.c:2128\n vfs_get_tree+0x9a/0x370 fs/super.c:1758\n fc_mount fs/namespace.c:1199 [inline]\n do_new_mount_fc fs/namespace.c:3642 [inline]\n do_new_mount fs/namespace.c:3718 [inline]\n path_mount+0x5b8/0x1ea0 fs/namespace.c:4028\n do_mount fs/namespace.c:4041 [inline]\n __do_sys_mount fs/namespace.c:4229 [inline]\n __se_sys_mount fs/namespace.c:4206 [inline]\n __x64_sys_mount+0x282/0x320 fs/namespace.c:4206\n ...\nRIP: 0033:0x7f969c9a8fde\nCode: 0f1f4000 48c7c2b0 fffffff7 d8648902 b8ffffff ffc3660f\n---[ end trace 0000000000000000 ]---\n\nThe bug is reproducible on 7.0.0-rc2-next-20260310 with our dynamic\nmetadata fuzzing tool that corrupts btrfs metadata at runtime.\n\n[CAUSE]\nA non-zero drop_progress.objectid means an interrupted\nbtrfs_drop_snapshot() left a resume point on disk, and in that case\ndrop_level must be greater than 0 because the checkpoint is only\nsaved at internal node levels.\n\nAlthough this invariant is enforced when the kernel writes the root\nitem, it is not validated when the root item is read back from disk.\nThat allows on-disk corruption to provide an invalid state with\ndrop_progress.objectid != 0 and drop_level == 0.\n\nWhen relocation recovery later processes such a root item,\nmerge_reloc_root() reads drop_level and hits BUG_ON(level == 0). The\nsame invalid metadata can also trigger the corresponding BUG_ON() in\nbtrfs_drop_snapshot().\n\n[FIX]\nFix this by validating the root_item invariant in tree-checker when\nreading root items from disk: if drop_progress.objectid is non-zero,\ndrop_level must also be non-zero. Reject such malformed metadata with\n-EUCLEAN before it reaches merge_reloc_root() or btrfs_drop_snapshot()\nand triggers the BUG_ON.\n\nAfter the fix, the same corruption is correctly rejected by tree-checker\nand the BUG_ON is no longer triggered.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-43046"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/295f8075d00442d71dc9ccae421ace1c0d2d9224"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/53ceedd1eb6280ca8359664e0226983eded2ed73"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/850de3d87f4720b71ccdcd44f4aa57e46b53a3f3"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ac68a9a8e481ab1becaed29d6d23087dac3de15d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b17b79ff896305fd74980a5f72afec370ee88ca4"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bedaf7d0b9d793e116f16b4d9a7dbc94bcc80443"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/de585ee18dd5601745f65a60fef7b7ceebd78c83"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-617" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-05-01T15:16:50Z"
  }
}