CVE-2025-66038
3.9 · LOWOverview
CVE-2025-66038 is a low-severity vulnerability affecting opensc_project opensc. It was published on March 30, 2026 and has a CVSS 3.1 base score of 3.9 (LOW).
This vulnerability has a CVSS 3.1 base score of 3.9, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical Description
OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims tag=0 and length=10 but no value bytes follow. Calling sc_compacttlv_find_tag with search tag 0x00 returns a pointer equal to buf+1 and outlen=10 without verifying that the claimed value length fits within the remaining buffer. In cases where the sc_compacttlv_find_tag is provided untrusted data (such as being read from cards/files), attackers may be able to influence it to return out-of-bounds pointers leading to downstream memory corruption when subsequent code tries to dereference the pointer. This issue has been patched in version 0.27.0.
Remediation
Check the references section for vendor advisories and patches from opensc_project. Update opensc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| opensc_project | opensc | >= 0, < 0.27.0 | Affected |
Frequently Asked Questions
What is CVE-2025-66038?
CVE-2025-66038 is a low-severity vulnerability affecting opensc_project opensc. It was published on March 30, 2026 and has a CVSS 3.1 base score of 3.9 (LOW).
How severe is CVE-2025-66038?
This vulnerability has a CVSS 3.1 base score of 3.9, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-66038?
Check the references section for vendor advisories and patches from opensc_project. Update opensc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-66038?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-66038 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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