CVE-2026-10275Public exploit

Memory corruption via unchecked token object ID

Published Jun 1, 2026 · Updated Jun 1, 2026

Buffer overflow in OpenSC Project OpenSC 0.26.0 and 0.26.1 allows attackers to corrupt process memory via a malicious PKCS#11 module. In test_kpgen_certwrite, memcpy uses a token-supplied CKA_ID length without bounding it to the 100-byte global opt_object_id buffer. Exploitation requires user interaction with a malicious module or smart card during key-generation testing, enabling a crash or corruption of adjacent global state.

CVSS severity5.0
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in OpenSC Project OpenSC 0.26.0 and 0.26.1 allows attackers to corrupt process memory via a malicious PKCS#11 module. In test_kpgen_certwrite, memcpy uses a token-supplied CKA_ID length without bounding it to the 100-byte global opt_object_id buffer. Exploitation requires user interaction with a malicious module or smart card during key-generation testing, enabling a crash or corruption of adjacent global state.

The record

CVE
CVE-2026-10275
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
OpenSC Project
Product
OpenSC
Classifications
CWE-120, CWE-119, T1204.002
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.26.0
  2. Affected versionversion=0.26.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

OpenSC Project · OpenSCversion=0.26.0; version=0.26.1

Published CVSS scores

5.1VulDBAV:N/AC:H/Au:N/C:P/I:P/A:P
5.0VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
1.3VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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