CVE-2026-43492: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-q8fh-4v85-p8mj
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CVSS 5.5
CWE-190
Published
Advisory Summary

CVE-2026-43492 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (CWE-190: Integer Overflow or Wraparound) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. this occurs when an integer value is incremented to a value that is too large to store in the associated representation. when this occurs, the value may become a very small or negative number.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-43492 at a Glance

CVE Identifier CVE-2026-43492
GHSA Identifier GHSA-q8fh-4v85-p8mj
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-190: Integer Overflow or Wraparound
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-2026-43492

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-2026-43492, 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-190: Integer Overflow or Wraparound, where the product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. this occurs when an integer value is incremented to a value that is too large to store in the associated representation. when this occurs, the value may become a very small or negative number. 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: lib/crypto: mpi: Fix integer underflow in mpi_read_raw_from_sgl() Yiming reports an integer underflow in mpi_read_raw_from_sgl() when subtracting "lzeros" from the unsigned "nbytes". For this to happen, the scatterlist "sgl" needs to occupy more bytes than the "nbytes" parameter and the first "nbytes + 1" bytes of the scatterlist must be zero. Under these conditions, the while loop iterating over the scatterlist will count more zeroes than "nbytes", subtract the number of zeroes from "nbytes" and cause the underflow. When commit 2d4d1eea540b ("lib/mpi: Add mpi sgl helpers") originally introduced the bug, it couldn't be triggered because all callers of mpi_read_raw_from_sgl() passed a scatterlist whose length was equal to "nbytes". However since commit 63ba4d67594a ("KEYS: asymmetric: Use new crypto interface without scatterlists"), the underflow can now actually be triggered. When invoking a KEYCTL_PKEY_ENCRYPT system call with a larger "out_len" than "in_len" and filling the "in" buffer with zeroes, crypto_akcipher_sync_prep() will create an all-zero scatterlist used for both the "src" and "dst" member of struct akcipher_request and thereby fulfil the conditions to trigger the bug: sys_keyctl() keyctl_pkey_e_d_s() asymmetric_key_eds_op() software_key_eds_op() crypto_akcipher_sync_encrypt() crypto_akcipher_sync_prep() crypto_akcipher_encrypt() rsa_enc() mpi_read_raw_from_sgl() To the user this will be visible as a DoS as the kernel spins forever, causing soft lockup splats as a side effect. Fix it.

References

NVD — CVE-2026-43492 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43492
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-784472.html
git.kernel.org/stable/c/1abd50fc3c... WEB
https://git.kernel.org/stable/c/1abd50fc3cfa16fc2074a3c8c2729c50fd9d7043
git.kernel.org/stable/c/26d3a97ad4... WEB
https://git.kernel.org/stable/c/26d3a97ad46c7a9226ec04d4bf35bd4998a97d16
git.kernel.org/stable/c/2aa77a18dc... WEB
https://git.kernel.org/stable/c/2aa77a18dc7f2670497fe3ee5acbeda0b57659e5
git.kernel.org/stable/c/30e513e755... WEB
https://git.kernel.org/stable/c/30e513e755bb381afce6fb57cdc8694136193f22
git.kernel.org/stable/c/6d63615c79... WEB
https://git.kernel.org/stable/c/6d63615c796c085b4984e3031b9fa77fffb47360
git.kernel.org/stable/c/8637dfb4c1... WEB
https://git.kernel.org/stable/c/8637dfb4c1d8a7026ef681f2477c6de8b71c4003
git.kernel.org/stable/c/8c2f128825... WEB
https://git.kernel.org/stable/c/8c2f1288250a90a4b5cabed5d888d7e3aeed4035
git.kernel.org/stable/c/a1793a4888... WEB
https://git.kernel.org/stable/c/a1793a48881ec8d26e9c79b0ee65753f1c6846a4

Frequently Asked Questions

What is CVE-2026-43492?
CVE-2026-43492 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-190: Integer Overflow or Wraparound.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-43492?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-43492?
CVE-2026-43492 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-2026-43492?
CVE-2026-43492 is classified under CWE-190: Integer Overflow or Wraparound (The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.).
How can I check Maven dependencies for CVE-2026-43492?
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 
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  "id" : "GHSA-q8fh-4v85-p8mj",
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  "published" : "2026-05-19T12:31:41Z",
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  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/crypto: mpi: Fix integer underflow in mpi_read_raw_from_sgl()\n\nYiming reports an integer underflow in mpi_read_raw_from_sgl() when\nsubtracting \"lzeros\" from the unsigned \"nbytes\".\n\nFor this to happen, the scatterlist \"sgl\" needs to occupy more bytes\nthan the \"nbytes\" parameter and the first \"nbytes + 1\" bytes of the\nscatterlist must be zero.  Under these conditions, the while loop\niterating over the scatterlist will count more zeroes than \"nbytes\",\nsubtract the number of zeroes from \"nbytes\" and cause the underflow.\n\nWhen commit 2d4d1eea540b (\"lib/mpi: Add mpi sgl helpers\") originally\nintroduced the bug, it couldn't be triggered because all callers of\nmpi_read_raw_from_sgl() passed a scatterlist whose length was equal to\n\"nbytes\".\n\nHowever since commit 63ba4d67594a (\"KEYS: asymmetric: Use new crypto\ninterface without scatterlists\"), the underflow can now actually be\ntriggered.  When invoking a KEYCTL_PKEY_ENCRYPT system call with a\nlarger \"out_len\" than \"in_len\" and filling the \"in\" buffer with zeroes,\ncrypto_akcipher_sync_prep() will create an all-zero scatterlist used for\nboth the \"src\" and \"dst\" member of struct akcipher_request and thereby\nfulfil the conditions to trigger the bug:\n\n  sys_keyctl()\n    keyctl_pkey_e_d_s()\n      asymmetric_key_eds_op()\n        software_key_eds_op()\n          crypto_akcipher_sync_encrypt()\n            crypto_akcipher_sync_prep()\n              crypto_akcipher_encrypt()\n                rsa_enc()\n                  mpi_read_raw_from_sgl()\n\nTo the user this will be visible as a DoS as the kernel spins forever,\ncausing soft lockup splats as a side effect.\n\nFix it.",
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