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Description

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 Reserved 2026-04-13 | Published 2026-05-29 | Updated 2026-05-29 | Assigner VulnCheck




LOW: 1.0CVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

LOW: 3.8CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

Problem types

Stack-based Buffer Overflow

Heap-based Buffer Overflow

Product status

Default status
affected

Any version before 0.27.0
affected

Any version before 0358817ec74aeca654f83e7709c7720b14c5db59
affected

Credits

Nicholas Carlini of Anthropic finder

References

github.com/...ommit/0358817ec74aeca654f83e7709c7720b14c5db59 patch

www.vulncheck.com/...r-overrun-in-do-key-value-via-profile-c third-party-advisory

cve.org (CVE-2026-40528)

nvd.nist.gov (CVE-2026-40528)

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