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CVE-2026-45999VulnerabilityPublished Updated

z_erofs_lz4_handle_overlap() · erofs: fix unsigned underflow

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 11:52 UTC

Severity
Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Microsoftmicrosoft/azure-linuxpkg:rpm/microsoft/azure-linuxOther threatsAffected
  • =3.0
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

No specific mitigation or workaround information is provided at this time.

Description

CVE-2026-45999 is a vulnerability in the erofs component related to an unsigned underflow in the function z_erofs_lz4_handle_overlap(). The vulnerability affects Microsoft products including Azure Linux 3.0. No CVSS score or detailed impact information is provided. There is no indication of known exploits in the wild. Patch status is not confirmed as no patch or vendor advisory details about remediation are available.

References

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