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CVE-2026-40528VulnerabilityPublished Updated

do_key_value() · OpenSC < 0.27.0 Buffer Overrun

Affects MicrosoftSource GCVE Database

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Not known to be exploited : upgrade to 0.27.0 when convenient.

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 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.27.0

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

Upgrade Microsoft to 0.27.0.

Affected software

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • =3.0
  • <0.27.0
Fixed in
  • 0.27.0

Description

A buffer overrun vulnerability exists in OpenSC versions prior to 0.27.0 in the do_key_value() function via profile.c. This vulnerability is classified as CWE-121 (stack-based buffer overflow). No CVSS score or detailed impact information is provided.

References

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