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Vulnerabilities

Vulnerability · CVE-2026-85440

MOOS core-moos through 10.4.0 MOOSDB Pre-Authentication Heap Overflow via Negative Packet Length

Published Sep 3, 2026 · catalog updated Oct 14, 2026 · MOOS core-moos through 10.4.0

Check if you run it

No confirmed exploitation is on record for CVE-2026-85440. EPSS is 1.03%. Act only if a listed version of MOOS core-moos through 10.4.0 is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (MOOS core-moos through 10.4.0).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.03%
Remediation
Advisory link
Affected products
cpe themoos/core-moos · vendor themoos core-moos

MOOS core-moos through 10.4.0 contains a pre-authentication heap overflow vulnerability in MOOSCommPkt packet handling that allows remote attackers to write arbitrary data by declaring a negative packet length. Attackers can exploit the signed integer check in InflateTo() and negative size conversion in recv() to overflow a four-byte heap buffer during the HandShake phase before authentication.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe themoos/core-moosversion unspecified
  • vendor themoos core-moosversion unspecified

How to fix CVE-2026-85440

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-85440. EPSS is 1.03%. Act only if a listed version of MOOS core-moos through 10.4.0 is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 1.03%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 3, 2026 · NIST NVD

    Detected

    MOOS core-moos through 10.4.0 contains a pre-authentication heap overflow vulnerability in MOOSCommPkt packet handling that allows remote attackers to write arbitrary data by declaring a negative packet length. Attackers can exploit the signed integer check in InflateTo() and negative size conversion in recv() to overflow a four-byte heap buffer during the HandShake phase before authentication.

  2. Oct 14, 2026 · NIST NVD

    Updated

    MOOS core-moos through 10.4.0 contains a pre-authentication heap overflow vulnerability in MOOSCommPkt packet handling that allows remote attackers to write arbitrary data by declaring a negative packet length. Attackers can exploit the signed integer check in InflateTo() and negative size conversion in recv() to overflow a four-byte heap buffer during the HandShake phase before authentication.

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-85440

    MOOS core-moos through 10.4.0 contains a pre-authentication heap overflow vulnerability in MOOSCommPkt packet handling that allows remote attackers to write arbitrary data by declaring a negative packet length. Attackers can exploit the signed integer check in InflateTo() and neg

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-85440

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-85440

    30-day exploitation probability 1.0%

    first.org
  • NIST NVDVulnerability recordCVE-2026-85440

    MOOS core-moos through 10.4.0 contains a pre-authentication heap overflow vulnerability in MOOSCommPkt packet handling that allows remote attackers to write arbitrary data by declaring a negative packet length. Attackers can exploit the signed integer check in InflateTo() and neg

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.