HOMEVULNERABILITIESCVE-2026-40510
MEDIUM

CVE-2026-40510

CWE-121Published: May 29, 2026· Updated: Jun 3, 2026

6.8
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:0.3th

Official Description

OpenSC before 0.27.0-rc1, fixed in commit 3f24f0b, contains a stack buffer overflow vulnerability in piv_process_history() in src/libopensc/card-piv.c that allows physically present attackers to trigger memory corruption by presenting a crafted PIV smart card or USB device returning a URL field longer than 118 bytes in the Key History Object ASN.1 response.

NVD Source

Technical Analysis

CVE-2026-40510 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorPhysical
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

opensc_project1 product
opensc
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/OpenSC/OpenSC/commit/3f24f0b48a481a8cf2e46059d8238a283ddc1c13
PATCHhttps://github.com/OpenSC/OpenSC/pull/3558
ADVISORYhttps://www.vulncheck.com/advisories/opensc-stack-buffer-overflow-via-piv-process-history-in-card-piv-c

All References (3)

→
https://github.com/OpenSC/OpenSC/commit/3f24f0b48a481a8cf2e46059d8238a283ddc1c13Patch
→
https://github.com/OpenSC/OpenSC/pull/3558Issue Tracking · Patch
→
https://www.vulncheck.com/advisories/opensc-stack-buffer-overflow-via-piv-process-history-in-card-piv-cThird Party Advisory

Quick Facts

CVE IDCVE-2026-40510
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessCWE-121
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMay 29, 2026

Related CVEs (CWE-121)

CVE-2026-12846
10.0
CVE-2026-12485
10.0
CVE-2026-37541
10.0
CVE-2026-12848
10.0
CVE-2017-20230
10.0
CVE-2026-12847
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-40510 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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