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CVE-2026-98636VulnerabilityPublished Updated

Microsoft · squashfs: Add dictionary size range check to prevent shift-out-of-bounds

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-98636· Medium

Not known to be exploited · fixed in e1ca4e3a380ef3e8f46ce006f1146392e3f32c98 : update Microsoft when convenient.

Data as of 2 Nov 2026, 10:58 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS
0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in e1ca4e3a380ef3e8f46ce006f1146392e3f32c98, c68e0068a236f9a7dfc19720bdf11e5d80a85089, b02948a23455f8190a53887b2d2c13ae1d360cea +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Oct 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 2 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ ff750311d30acc9564ef577050794953eee59f01, < e1ca4e3a380ef3e8f46ce006f1146392e3f32c98
Fixed in
  • e1ca4e3a380ef3e8f46ce006f1146392e3f32c98
LinuxLinuxAffected
  • ≥ ff750311d30acc9564ef577050794953eee59f01, < c68e0068a236f9a7dfc19720bdf11e5d80a85089
Fixed in
  • c68e0068a236f9a7dfc19720bdf11e5d80a85089
LinuxLinuxAffected
  • ≥ ff750311d30acc9564ef577050794953eee59f01, < b02948a23455f8190a53887b2d2c13ae1d360cea
Fixed in
  • b02948a23455f8190a53887b2d2c13ae1d360cea
LinuxLinuxAffected
  • ≥ ff750311d30acc9564ef577050794953eee59f01, < 88c673a0bd233df44ca0020da82f4fd3876de27a
Fixed in
  • 88c673a0bd233df44ca0020da82f4fd3876de27a
LinuxLinuxAffected
  • ≥ ff750311d30acc9564ef577050794953eee59f01, < 9d9c5c218ea356a1d88765214ad2919605280ab1
Fixed in
  • 9d9c5c218ea356a1d88765214ad2919605280ab1
LinuxLinuxAffected
  • ≥ ff750311d30acc9564ef577050794953eee59f01, < 7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1
Fixed in
  • 7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1

Description

A vulnerability identified as CVE-2026-98636 affects Microsoft products involving squashfs, where a missing dictionary size range check could lead to a shift-out-of-bounds condition. The vulnerability is present in versions 3.0 and 4.0. No CVSS score or detailed impact information is provided.

References

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