What’s Vulnerable › Vulnerabilities

CVE-2020-26572

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-06 · updated 2026-06-17
• Weakness: CWE-787

Description

The TCOS smart card software driver in OpenSC before 0.21.0-rc1 has a stack-based buffer overflow in tcos_decipher.

Affected products

• Debian Linux: 9.0
• Fedoraproject Fedora: 33
• OpenSC: through 0.20.0

References

• http://www.openwall.com/lists/oss-security/2020/11/24/4
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22967
• https://github.com/OpenSC/OpenSC/commit/9d294de90d1cc66956389856e60b6944b27b4817
• https://lists.debian.org/debian-lts-announce/2021/11/msg00027.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXOHFDMNMO6IDECAGUTB3SJGAGXVRT6S/
• http://www.openwall.com/lists/oss-security/2020/11/24/4
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22967
• https://github.com/OpenSC/OpenSC/commit/9d294de90d1cc66956389856e60b6944b27b4817
• https://lists.debian.org/debian-lts-announce/2021/11/msg00027.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXOHFDMNMO6IDECAGUTB3SJGAGXVRT6S/

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