Microsoft advisory for CVE-2026-40528 — azl3 opensc 0.27.1-1 on Azure Linux 3.0
🔗 CVE IDs covered (1)
📋 Microsoft's advisory
EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40528. This page also shows what EchelonGraph holds for CVE-2026-40528, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.
🎯 Affected products1
- azl3 opensc 0.27.1-1 on Azure Linux 3.0
🧭 EchelonGraph on CVE-2026-40528
- EchelonGraph score
- 7.8 HIGH
- CISA KEV
- Not listed
- Fix status
- An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.
Description from the CVE record (CVE.org), as published by its numbering authority
OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun vulnerability in the do_key_value() function in src/pkcs15init/profile.c that allows attackers to corrupt memory by supplying a crafted profile configuration file. During pkcs15-init invocation, a key value entry beginning with '=' followed by more than sizeof(keybuf) characters is copied into keybuf via memcpy without a length check, causing both stack and heap buffer overruns.
Published by VulnCheck, the CVE Numbering Authority that assigned CVE-2026-40528, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).