Medium
opensc — security advisory
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.
- Products
- opensc
- Affected versions
- 0.15.0-1ubuntu1, 0.15.0-1ubuntu1+esm1, 0.15.0-1ubuntu1+esm2, 0.15.0-1ubuntu1+esm3, 0.17.0-1, 0.17.0-2, 0.17.0-2build1, 0.17.0-3, 0.17.0-3ubuntu0.1~esm1, 0.17.0-3ubuntu0.1~esm2, 0.17.0-3ubuntu0.1~esm3, 0.19.0-2, 0.20.0-1, 0.20.0-2, 0.20.0-3, 0.20.0-3ubuntu0.1~esm1, 0.20.0-3ubuntu0.1~esm2, 0.20.0-3ubuntu0.1~esm3, 0.20.0-3ubuntu0.1~esm4, 0.21.0-1ubuntu1, 0.22.0-1ubuntu2, 0.22.0-1ubuntu2+esm1, 0.22.0-1ubuntu2.1, 0.22.0-1ubuntu2.1+esm1, 0.23.0-1ubuntu4, 0.24.0~rc1-1, 0.25.0~rc1-1, 0.25.0~rc1-1build1, 0.25.0~rc1-1build2, 0.25.0~rc1-1ubuntu0.1, 0.25.0~rc1-1ubuntu0.1~esm1, 0.25.0~rc1-1ubuntu0.2, 0.25.0~rc1-1ubuntu0.2+esm1, 0.26.1-1, 0.26.1-2, 0.26.1-3, 0.26.1-3ubuntu1, 0.27.0~rc1-1, 0.27.1-2, 0.27.1-2ubuntu1, 0.27.1-2ubuntu2
- Fixed versions
- Not specified
- CVEs
- CVE-2025-66038
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:48 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2025-66038
opensc
Fixed versions: Not specified
opensc
Fixed versions: Not specified
opensc
Fixed versions: Not specified
opensc
Fixed versions: Not specified
opensc
Fixed versions: Not specified
opensc
Fixed versions: Not specified
opensc
Fixed versions: Not specified
opensc
Fixed versions: Not specified
Complete source record
{
"id": "a69cd3f570ce1e4b1ff360c4d555b78595166c4730d418b64cb508c57593313d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-66038",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-66038",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2025-66038",
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"name": {
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"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/4/versions"
},
{
"value": "0.24.0~rc1-1",
"evidence": "/affected/4/versions"
},
{
"value": "0.25.0~rc1-1",
"evidence": "/affected/4/versions"
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{
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{
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{
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{
"name": {
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},
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{
"value": "0.27.1-2",
"evidence": "/affected/6/versions"
},
{
"value": "0.27.1-2ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "0.27.1-2ubuntu2",
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}
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}
],
"modified": "2026-10-17T12:57:27.919657672Z",
"provider": "osv",
"upstream": [
"CVE-2025-66038"
],
"references": [
"https://ubuntu.com/security/CVE-2025-66038",
"https://www.cve.org/CVERecord?id=CVE-2025-66038"
]
},
"related_cves": [
{
"value": "CVE-2025-66038",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 357545,
"published_at": "2026-03-30T18:16:00+00:00"
}