CVE-2026-89541: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-8h82-j8r3-jr82
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CVSS 9.8
Published
Advisory Summary

CVE-2026-89541 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-2026-89541 at a Glance

CVE Identifier CVE-2026-89541
GHSA Identifier GHSA-8h82-j8r3-jr82
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

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-2026-89541

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-2026-89541, 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: SUNRPC: harden gss_unwrap_resp_priv length checks gss_unwrap_resp_priv() validates the RPCSEC_GSS opaque length with offset = (u8 *)(p) - (u8 *)head->iov_base; if (offset + opaque_len > rcv_buf->len) goto unwrap_failed; maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, offset + opaque_len, rcv_buf); Both operands are u32 and the sum is computed in u32. A reply with opaque_len near 0xffffffff makes offset + opaque_len wrap to a small value that is below rcv_buf->len, so the bound check passes and gss_unwrap() is called with end < begin. The check also lacks a lower bound, so any opaque_len in [0, GSS_KRB5_TOK_HDR_LEN) is accepted and forwarded to gss_krb5_unwrap_v2(), whose pre-decrypt header reads at ptr+4 and ptr+6 then run past the token. A krb5p NFS server returning a crafted RPCSEC_GSS reply can drive the client into out-of-bounds reads in gss_krb5_unwrap_v2() and the rotate_left() loop that follows. Fix by replacing the single combined check with three guards that are safe in u32 arithmetic and that enforce the RFC 4121 minimum outer token length: if (offset > rcv_buf->len) goto unwrap_failed; if (opaque_len > rcv_buf->len - offset) goto unwrap_failed; if (opaque_len < GSS_KRB5_TOK_HDR_LEN) goto unwrap_failed; The first guard makes the subtraction in the second guard unconditionally safe; offset is derived from a successful xdr_inline_decode() in the head kvec, so in practice it already satisfies the bound. The floor mirrors the server-side check added in commit 5b757c2e57a5 ("SUNRPC: svcauth_gss: enforce krb5 token minimum length").

References

NVD — CVE-2026-89541 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89541
git.kernel.org/stable/c/3691c4b348... WEB
https://git.kernel.org/stable/c/3691c4b3488d8ca046b9941e5be30c626dbbbb50
git.kernel.org/stable/c/401f6a5b33... WEB
https://git.kernel.org/stable/c/401f6a5b338d05bb1069ad814d9f77e3c367854f
git.kernel.org/stable/c/81fd7654a8... WEB
https://git.kernel.org/stable/c/81fd7654a8429718adfcb2a7e03496077f547ed0
git.kernel.org/stable/c/85fa6b12e8... WEB
https://git.kernel.org/stable/c/85fa6b12e8f439739ac36ef2aad925f37c8b976a
git.kernel.org/stable/c/87831b9211... WEB
https://git.kernel.org/stable/c/87831b92112c81db251d46756d65daa4f91af6a2
git.kernel.org/stable/c/89a15a50f8... WEB
https://git.kernel.org/stable/c/89a15a50f84d32d4b99db86f957427fcbe20a99a
git.kernel.org/stable/c/d395c30d57... WEB
https://git.kernel.org/stable/c/d395c30d570ca6168f0297b191709927d1258273
git.kernel.org/stable/c/ebcbd2523a... WEB
https://git.kernel.org/stable/c/ebcbd2523a8524c3d24e111cdbed8e271d910269

Frequently Asked Questions

What is CVE-2026-89541?
CVE-2026-89541 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-2026-89541?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89541?
CVE-2026-89541 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-2026-89541?
CVE-2026-89541 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89541?
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-8h82-j8r3-jr82",
  "modified" : "2026-09-14T15:32:28Z",
  "published" : "2026-09-11T21:31:31Z",
  "aliases" : [ "CVE-2026-89541" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: harden gss_unwrap_resp_priv length checks\n\ngss_unwrap_resp_priv() validates the RPCSEC_GSS opaque length with\n\n    offset = (u8 *)(p) - (u8 *)head->iov_base;\n    if (offset + opaque_len > rcv_buf->len)\n            goto unwrap_failed;\n    maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset,\n                          offset + opaque_len, rcv_buf);\n\nBoth operands are u32 and the sum is computed in u32. A reply with\nopaque_len near 0xffffffff makes offset + opaque_len wrap to a small\nvalue that is below rcv_buf->len, so the bound check passes and\ngss_unwrap() is called with end < begin. The check also lacks a\nlower bound, so any opaque_len in [0, GSS_KRB5_TOK_HDR_LEN) is\naccepted and forwarded to gss_krb5_unwrap_v2(), whose pre-decrypt\nheader reads at ptr+4 and ptr+6 then run past the token.\n\nA krb5p NFS server returning a crafted RPCSEC_GSS reply can drive\nthe client into out-of-bounds reads in gss_krb5_unwrap_v2() and the\nrotate_left() loop that follows.\n\nFix by replacing the single combined check with three guards that\nare safe in u32 arithmetic and that enforce the RFC 4121 minimum\nouter token length:\n\n    if (offset > rcv_buf->len)\n            goto unwrap_failed;\n    if (opaque_len > rcv_buf->len - offset)\n            goto unwrap_failed;\n    if (opaque_len < GSS_KRB5_TOK_HDR_LEN)\n            goto unwrap_failed;\n\nThe first guard makes the subtraction in the second guard\nunconditionally safe; offset is derived from a successful\nxdr_inline_decode() in the head kvec, so in practice it already\nsatisfies the bound. The floor mirrors the server-side check added\nin commit 5b757c2e57a5 (\"SUNRPC: svcauth_gss: enforce krb5 token\nminimum length\").",
  "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-2026-89541"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3691c4b3488d8ca046b9941e5be30c626dbbbb50"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/401f6a5b338d05bb1069ad814d9f77e3c367854f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/81fd7654a8429718adfcb2a7e03496077f547ed0"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/85fa6b12e8f439739ac36ef2aad925f37c8b976a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/87831b92112c81db251d46756d65daa4f91af6a2"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/89a15a50f84d32d4b99db86f957427fcbe20a99a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d395c30d570ca6168f0297b191709927d1258273"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ebcbd2523a8524c3d24e111cdbed8e271d910269"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:19:37Z"
  }
}