CVE-2026-80561: Software Security Vulnerability Vulnerability

CRITICAL

Advisory Identifier: GHSA-g3cj-79m7-wg3j

CVSS 9.8

Published 2026-08-27

Advisory Summary

CVE-2026-80561 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-80561 at a Glance

CVE Identifier CVE-2026-80561

GHSA Identifier GHSA-g3cj-79m7-wg3j

Severity CRITICAL

CVSS v3.1 Base Score 9.8

CWE Classification General Security Weakness

Affected Product Software

Package Ecosystem Maven

Published Date 2026-08-27

Last Updated 2026-08-27

Security Impact

CVSS: 9.8

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:H/I:H/A:H).

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 High (C:H)

Integrity High (I:H)

Availability High (A:H)

How to Fix CVE-2026-80561

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-2026-80561, 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 General Security Weakness. 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: libceph: fix multiple unsafe decodes in decode_locker() decode_locker() in cls_lock_client.c contains three unsafe decode operations that allow a malicious or compromised OSD to trigger slab-out-of-bounds reads: 1. ceph_decode_copy() at the locker_id_t name field has no preceding bounds check. With p == end after ceph_start_decoding() accepts struct_len=0, this reads sizeof(ceph_entity_name) = 9 bytes past the validated buffer boundary. 2. *p += sizeof(struct ceph_timespec) after the locker_info_t header is an unchecked pointer advance. A malicious OSD can position p past end, causing all subsequent _safe checks to pass against a bogus boundary. 3. len = ceph_decode_32(p) has no preceding bounds check, and the immediately following *p += len is uncapped. A malicious OSD can send len=0xffffffff, advancing p gigabytes past end and escaping the decode window entirely. Fix all three by replacing bare operations with their safe variants: ceph_decode_copy -> ceph_decode_copy_safe *p += sizeof(...) -> ceph_decode_skip_n ceph_decode_32(p) -> ceph_decode_32_safe *p += len -> ceph_decode_skip_n A new label is added to return -EINVAL on any bounds violation. -EINVAL is appropriate here: the data received from the OSD is structurally malformed, which is an invalid argument to the decode contract regardless of whether the caller or the wire is at fault. Attacker model: a malicious or compromised OSD in a multi-tenant Ceph deployment can trigger this against any kernel client that issues the lock.get_info class method (e.g. during RBD exclusive lock acquisition) without any further privileges beyond OSD session establishment. [ idryomov: use ceph_decode_skip_string() to skip description, trim changelog ]

References

NVD — CVE-2026-80561 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-80561

git.kernel.org/stable/c/1ed45c8d96... WEB

https://git.kernel.org/stable/c/1ed45c8d96498725eb54f740172f9068d8673906

git.kernel.org/stable/c/3c3716dc06... WEB

https://git.kernel.org/stable/c/3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070

git.kernel.org/stable/c/437b6551cf... WEB

https://git.kernel.org/stable/c/437b6551cfcc235eea1d735a874f9d421f555e17

git.kernel.org/stable/c/51c8d238fe... WEB

https://git.kernel.org/stable/c/51c8d238fe7236de627ab1a1433694552a904136

git.kernel.org/stable/c/6265103e78... WEB

https://git.kernel.org/stable/c/6265103e78f0ee7e2518de9cf938b94bee9700a0

git.kernel.org/stable/c/d1bba38574... WEB

https://git.kernel.org/stable/c/d1bba38574d095f191557d397d9633f08cd966b1

git.kernel.org/stable/c/dbfd83f722... WEB

https://git.kernel.org/stable/c/dbfd83f722a78446ec18a476ef7a38e52240b50a

git.kernel.org/stable/c/fa4aa86fff... WEB

https://git.kernel.org/stable/c/fa4aa86fff0c56799c2e3f51a88879053285f4a9

Frequently Asked Questions

What is CVE-2026-80561?

CVE-2026-80561 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.

Which Software versions are affected?

Affected versions include releases prior to current release patches.

What version fixes CVE-2026-80561?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

What is the CVSS score of CVE-2026-80561?

CVE-2026-80561 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

What CWE is associated with CVE-2026-80561?

CVE-2026-80561 is classified under General Security Weakness.

How can I check Maven dependencies for CVE-2026-80561?

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-g3cj-79m7-wg3j",
  "modified" : "2026-08-27T06:31:32Z",
  "published" : "2026-08-27T06:31:32Z",
  "aliases" : [ "CVE-2026-80561" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix multiple unsafe decodes in decode_locker()\n\ndecode_locker() in cls_lock_client.c contains three unsafe decode\noperations that allow a malicious or compromised OSD to trigger\nslab-out-of-bounds reads:\n\n1. ceph_decode_copy() at the locker_id_t name field has no preceding\n   bounds check. With p == end after ceph_start_decoding() accepts\n   struct_len=0, this reads sizeof(ceph_entity_name) = 9 bytes past\n   the validated buffer boundary.\n\n2. *p += sizeof(struct ceph_timespec) after the locker_info_t header\n   is an unchecked pointer advance. A malicious OSD can position p\n   past end, causing all subsequent _safe checks to pass against a\n   bogus boundary.\n\n3. len = ceph_decode_32(p) has no preceding bounds check, and the\n   immediately following *p += len is uncapped. A malicious OSD can\n   send len=0xffffffff, advancing p gigabytes past end and escaping\n   the decode window entirely.\n\nFix all three by replacing bare operations with their safe variants:\n  ceph_decode_copy   -> ceph_decode_copy_safe\n  *p += sizeof(...)  -> ceph_decode_skip_n\n  ceph_decode_32(p)  -> ceph_decode_32_safe\n  *p += len          -> ceph_decode_skip_n\n\nA new label is added to return -EINVAL on any bounds violation.\n-EINVAL is appropriate here: the data received from the OSD\nis structurally malformed, which is an invalid argument to the decode\ncontract regardless of whether the caller or the wire is at fault.\n\nAttacker model: a malicious or compromised OSD in a multi-tenant Ceph\ndeployment can trigger this against any kernel client that issues the\nlock.get_info class method (e.g. during RBD exclusive lock acquisition)\nwithout any further privileges beyond OSD session establishment.\n\n[ idryomov: use ceph_decode_skip_string() to skip description, trim\n  changelog ]",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-80561"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1ed45c8d96498725eb54f740172f9068d8673906"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/437b6551cfcc235eea1d735a874f9d421f555e17"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/51c8d238fe7236de627ab1a1433694552a904136"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6265103e78f0ee7e2518de9cf938b94bee9700a0"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d1bba38574d095f191557d397d9633f08cd966b1"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/dbfd83f722a78446ec18a476ef7a38e52240b50a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/fa4aa86fff0c56799c2e3f51a88879053285f4a9"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-26T15:17:11Z"
  }
}

CVSS V3

9.8 CRITICAL