EUVD-2026-33315
GHSA-7rrw-cv3r-3cgg
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Stack buffer overflow in OpenSC's PIV card handler allows a physically present attacker to corrupt memory by presenting a crafted PIV smart card or USB device that returns a URL field exceeding 118 bytes in the Key History Object ASN.1 response, triggering the overflow in piv_process_history() within src/libopensc/card-piv.c. All OpenSC versions prior to 0.27.0-rc1 are affected; the vulnerability is confirmed by the vendor fix in commit 3f24f0b and PR #3558. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to be physically present and able to insert a crafted PIV smart card or USB device emulating a smart card into the target machine - remote exploitation is not possible per AV:P. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 1.0 is the primary quantitative signal and accurately reflects severe real-world constraints: physical access required (AV:P), high attack complexity (AC:H), passive user interaction required (UI:P), and only Low impact across confidentiality, integrity, and availability with no scope change to subsequent components (SC:N/SI:N/SA:N). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An adversary with physical access to a workstation - such as a malicious insider or a supply-chain attacker who has tampered with smart cards - inserts a crafted PIV card or a USB device emulating a smart card reader that returns a Key History Object whose URL field exceeds 118 bytes in the ASN.1 response. When OpenSC's `piv_process_history()` function processes the card, the oversized URL overflows the fixed stack buffer before the missing bounds check, triggering memory corruption. … |
| Remediation | The upstream fix is available in commit 3f24f0b and PR #3558 against the OpenSC GitHub repository, targeting release 0.27.0-rc1; however, 0.27.0-rc1 is a release candidate - a final stable tagged release has not been independently confirmed at time of analysis, so organizations should monitor https://github.com/OpenSC/OpenSC/releases for the stable 0.27.0 release. … Detailed patch versions, workarounds, and compensating controls in full report. |
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