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.

The AlmaLinux 9.6 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1778674879 advisory.

  - A vulnerability was found in OpenSC, OpenSC tools, PKCS#11 module, minidriver, and CTK. An attacker could     use a crafted USB Device or Smart Card, which would present the system with a specially crafted response     to APDUs. When buffers are partially filled with data, initialized parts of the buffer can be incorrectly     accessed. (CVE-2024-45619)

  - OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with     physical access to the computer at the time user or administrator uses a token can cause a stack-buffer-     overflow write in GET RESPONSE. The attack requires crafted USB device or smart card that would present     the system with specially crafted responses to the APDUs. This issue has been patched in version 0.27.0.
    (CVE-2025-49010)

  - OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input     to the fuzz_pkcs15_reader harness causes OpenSC to perform an out-of-bounds heap read in the X.509/SPKI     handling path. Specifically, sc_pkcs15_pubkey_from_spki_fields() allocates a zero-length buffer and then     reads one byte past the end of that allocation. This issue has been patched in version 0.27.0.
    (CVE-2025-66037)

  - 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. (CVE-2025-66038)

  - OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with     physical access to the computer at the time user or administrator uses a token can cause a stack-buffer-     overflow WRITE in card-oberthur. The attack requires crafted USB device or smart card that would present     the system with specially crafted responses to the APDUs. This issue has been patched in version 0.27.0.
    (CVE-2025-66215)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 9.6 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1778674879 advisory.

  - A vulnerability was found in OpenSC, OpenSC tools, PKCS#11 module, minidriver, and CTK. An attacker could     use a crafted USB Device or Smart Card, which would present the system with a specially crafted response     to APDUs. When buffers are partially filled with data, initialized parts of the buffer can be incorrectly     accessed. (CVE-2024-45619)

  - OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with     physical access to the computer at the time user or administrator uses a token can cause a stack-buffer-     overflow write in GET RESPONSE. The attack requires crafted USB device or smart card that would present     the system with specially crafted responses to the APDUs. This issue has been patched in version 0.27.0.
    (CVE-2025-49010)

  - OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input     to the fuzz_pkcs15_reader harness causes OpenSC to perform an out-of-bounds heap read in the X.509/SPKI     handling path. Specifically, sc_pkcs15_pubkey_from_spki_fields() allocates a zero-length buffer and then     reads one byte past the end of that allocation. This issue has been patched in version 0.27.0.
    (CVE-2025-66037)

  - 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. (CVE-2025-66038)

  - OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with     physical access to the computer at the time user or administrator uses a token can cause a stack-buffer-     overflow WRITE in card-oberthur. The attack requires crafted USB device or smart card that would present     the system with specially crafted responses to the APDUs. This issue has been patched in version 0.27.0.
    (CVE-2025-66215)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The AlmaLinux 9.2 host has a package installed that is affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1779190223 advisory.

  - A vulnerability was found in OpenSC where PKCS#1 encryption padding removal is not implemented as side-     channel resistant. This issue may result in the potential leak of private data. (CVE-2023-5992)

  - OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with     physical access to the computer at the time user or administrator uses a token can cause a stack-buffer-     overflow write in GET RESPONSE. The attack requires crafted USB device or smart card that would present     the system with specially crafted responses to the APDUs. This issue has been patched in version 0.27.0.
    (CVE-2025-49010)

  - OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input     to the fuzz_pkcs15_reader harness causes OpenSC to perform an out-of-bounds heap read in the X.509/SPKI     handling path. Specifically, sc_pkcs15_pubkey_from_spki_fields() allocates a zero-length buffer and then     reads one byte past the end of that allocation. This issue has been patched in version 0.27.0.
    (CVE-2025-66037)

  - 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. (CVE-2025-66038)

  - OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with     physical access to the computer at the time user or administrator uses a token can cause a stack-buffer-     overflow WRITE in card-oberthur. The attack requires crafted USB device or smart card that would present     the system with specially crafted responses to the APDUs. This issue has been patched in version 0.27.0.
    (CVE-2025-66215)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2697-1 advisory.

    This update for opensc fixes the following issues

    - CVE-2025-49010: stack-buffer-overflow via crafted smart card or USB device responses (bsc#1261214).
    - CVE-2025-66037: crafted input can cause an out-of-bounds read (bsc#1261218).
    - CVE-2025-66038: improper compact-TLV length validation can lead to crash or unexpected behavior     (bsc#1261219).
    - CVE-2025-66215: crafted smart card or USB device can cause a stack-buffer-overflow write (bsc#1261220).
    - CVE-2026-10275: global buffer overflow during key pair generation tests due to missing input validation     (bsc#1267246).
    - CVE-2026-40528: stack and heap buffer overrun in the `do_key_value()` function due to missing length     check allows for       memory corruption via a crafted profile configuration file (bsc#1266963).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2657-1 advisory.

    This update for opensc fixes the following issues

    - CVE-2025-49010: stack-buffer-overflow via crafted smart card or USB device responses (bsc#1261214).
    - CVE-2025-66037: crafted input can cause an out-of-bounds read (bsc#1261218).
    - CVE-2025-66038: improper compact-TLV length validation can lead to crash or unexpected behavior     (bsc#1261219).
    - CVE-2025-66215: crafted smart card or USB device can cause a stack-buffer-overflow write (bsc#1261220).
    - CVE-2026-10275: global buffer overflow during key pair generation tests due to missing input validation     (bsc#1267246).
    - CVE-2026-40528: stack and heap buffer overrun in the `do_key_value()` function due to missing length     check allows for       memory corruption via a crafted profile configuration file (bsc#1266963).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES16 / SLES_SAP16 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22126-1 advisory.

    - CVE-2025-49010: stack-buffer-overflow via crafted smart card or USB device responses (bsc#1261214).
    - CVE-2025-66037: crafted input can cause an out-of-bounds read (bsc#1261218).
    - CVE-2025-66038: improper compact-TLV length validation can lead to crash or unexpected behavior     (bsc#1261219).
    - CVE-2025-66215: crafted smart card or USB device can cause a stack-buffer-overflow write (bsc#1261220).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-8c5856afbb advisory.

    New upstream release (#2442363) fixing various security issues.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-de85b06438 advisory.

    New upstream release (#2442363) fixing various security issues

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-4440b00e25 advisory.

    New upstream release (#2442363) fixing various security issues:

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2025-66038)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
361931	AlmaLinux 9.6 [TuxCare] Security Update: opensc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1778674879)	Nessus	Alma Linux Local Security Checks	Local	medium
361578	Rocky Linux 9.6 [TuxCare] Security Update: opensc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1778674879)	Nessus	Rocky Linux Local Security Checks	Local	medium
360078	AlmaLinux 9.2 [TuxCare] Security Update: opensc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1779190223)	Nessus	Alma Linux Local Security Checks	Local	medium
324873	SUSE SLED15 / SLES15 Security Update : opensc (SUSE-SU-2026:2697-1)	Nessus	SuSE Local Security Checks	Local	low
323240	SUSE SLES15 Security Update : opensc (SUSE-SU-2026:2657-1)	Nessus	SuSE Local Security Checks	Local	low
321602	SUSE SLES16 Security Update : opensc (SUSE-SU-2026:22126-1)	Nessus	SuSE Local Security Checks	Local	medium
310686	Fedora 44 : opensc (2026-8c5856afbb)	Nessus	Fedora Local Security Checks	Local	medium
307053	Fedora 42 : opensc (2026-de85b06438)	Nessus	Fedora Local Security Checks	Local	medium
305674	Fedora 43 : opensc (2026-4440b00e25)	Nessus	Fedora Local Security Checks	Local	medium
304369	Linux Distros Unpatched Vulnerability : CVE-2025-66038	Nessus	Misc.	Local	medium

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CVE-2025-66038

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