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CVE-2026-40528 (GCVE-0-2026-40528)

Vulnerability from cvelistv5 – Published: 2026-05-29 13:38 – Updated: 2026-07-14 20:00 X_Open Source
VLAI
Title
OpenSC < 0.27.0 Buffer Overrun in do_key_value() via profile.c
Summary
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.
Severity
1 (Low)
CVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
3.8 (Low)
CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-29 13:58 UTC
CWE
  • CWE-121 - Stack-based Buffer Overflow
  • CWE-122 - Heap-based Buffer Overflow
Assigner
References
Impacted products
Vendor Product Version CPE status
OpenSC OpenSC Affected: 0 , < 0.27.0 (semver)
Affected: 0 , < 0358817ec74aeca654f83e7709c7720b14c5db59 (git)
    cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:*
    cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-03-30 00:00
Credits
Nicholas Carlini of Anthropic
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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