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Fencer Vulns
medium 5.5

CVE-2020-26570 json

The Oberthur smart card software driver in OpenSC before 0.21.0-rc1 has a heap-based buffer overflow in sc_oberthur_read_file.

published 2020-10-06 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-19115

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

The Oberthur smart card software driver in OpenSC before 0.21.0-rc1 has a heap-based buffer overflow in sc_oberthur_read_file.

Patch / fix

  • opensc Debian 14, Debian 13, Debian 12 0.21.0-1

debian advisories DEBIAN-CVE-2020-26570

  • opensc Ubuntu Pro 16.04 LTS 0.15.0-1ubuntu1+esm1
  • opensc Ubuntu Pro 18.04 LTS 0.17.0-3ubuntu0.1~esm1
  • opensc Ubuntu Pro 20.04 LTS 0.20.0-3ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-26570

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • opensc RHEL 8 0.20.0-4.el8

red hat advisories RHSA-2021:1600

  • opensc SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 0.18.0-150000.3.23.1
  • opensc SLE Module for Basesystem 15 SP2 0.19.0-3.7.1
  • opensc SLES for SAP 12 SP5, SLES 12 SP5 0.13.0-3.11.1

suse advisories SUSE-SU-2022:1041-1SUSE-SU-2021:1168-1SUSE-SU-2021:0998-1

  • opensc openSUSE Tumbleweed 0.21.0-2.2
  • opensc openSUSE Leap 15.2 0.19.0-lp152.3.3.1

opensuse advisories openSUSE-SU-2024:11123-1openSUSE-SU-2021:0565-1

  • opensc AlmaLinux 8 0.20.0-4.el8

almalinux advisories ALSA-2021:1600

  • opensc Rocky Linux 8 0.20.0-4.el8

rocky linux advisories RLSA-2021:1600

  • opensc Alpine 3.12 0.20.0-r2
  • opensc Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 0.21.0-r0

alpine advisories ALPINE-CVE-2020-26570

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • opensc CBL-Mariner 2.0 0.22.0-1

azure linux advisories AZL-6772

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • opensc Arch Linux 0.21.0-1

arch linux advisories AVG-1298

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-26570 updated cvss 6.4

opensc: heap-based buffer overflow in sc_oberthur_read_file

  • Red Hat Enterprise Linux 7 opensc
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux BaseOS (v. 8) opensc 0.20.0-4.el8
    fixed: vendor fix RHSA-2021:1600

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.