HighFix available
botan — security advisory
An issue was discovered in Botan 1.11.32 through 2.x before 2.6.0. An off-by-one error when processing malformed TLS-CBC ciphertext could cause the receiving side to include in the HMAC computation exactly 64K bytes of data following the record buffer, aka an over-read. The MAC comparison will subsequently fail and the connection will be closed. This could be used for denial of service. No information leak occurs.
- Products
- botan
- Affected versions
- Not specified
- Fixed versions
- 2.6.0-r0
- CVEs
- CVE-2018-9860
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:01 UTC · Revision 1
Source evidence
An issue was discovered in Botan 1.11.32 through 2.x before 2.6.0. An off-by-one error when processing malformed TLS-CBC ciphertext could cause the receiving side to include in the HMAC computation exactly 64K bytes of data following the record buffer, aka an over-read. The MAC comparison will subsequently fail and the connection will be closed. This could be used for denial of service. No information leak occurs.
osv:ALPINE-CVE-2018-9860
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
botan
Fixed versions: 2.6.0-r0
Complete source record
{
"id": "9d6ff052b9949dd5b7062d83693a93b93758e661058295e5134e931dfea8d655",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2018-9860",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2018-9860",
"summary": "An issue was discovered in Botan 1.11.32 through 2.x before 2.6.0. An off-by-one error when processing malformed TLS-CBC ciphertext could cause the receiving side to include in the HMAC computation exactly 64K bytes of data following the record buffer, aka an over-read. The MAC comparison will subsequently fail and the connection will be closed. This could be used for denial of service. No information leak occurs.",
"evidence": "osv:ALPINE-CVE-2018-9860",
"products": [
{
"name": {
"value": "botan",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.6.0-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.6.0-r0",
"evidence": "/affected/1/ranges"
}
],
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},
{
"name": {
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},
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{
"value": "2.6.0-r0",
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}
],
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{
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"evidence": "/affected/3/ranges"
}
],
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},
{
"name": {
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"evidence": "/affected/4/package/name"
},
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"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
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{
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}
],
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},
{
"name": {
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"evidence": "/affected/7/package/name"
},
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{
"value": "2.6.0-r0",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/8/package/name"
},
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{
"value": "2.6.0-r0",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.6.0-r0",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.6.0-r0",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "ALPINE-CVE-2018-9860",
"aliases": [
"ALPINE-CVE-2018-9860"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "1.11.32"
},
{
"fixed": "2.6.0-r0"
}
]
}
],
"package": {
"name": "botan",
"purl": "pkg:apk/alpine/botan?arch=source",
"ecosystem": "Alpine:v3.11"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2018-9860.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
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{
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},
{
"fixed": "2.6.0-r0"
}
]
}
],
"package": {
"name": "botan",
"purl": "pkg:apk/alpine/botan?arch=source",
"ecosystem": "Alpine:v3.12"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2018-9860.json"
},
"ecosystem_specific": {}
},
{
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{
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}
],
"package": {
"name": "botan",
"purl": "pkg:apk/alpine/botan?arch=source",
"ecosystem": "Alpine:v3.13"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2018-9860.json"
},
"ecosystem_specific": {}
},
{
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{
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],
"package": {
"name": "botan",
"purl": "pkg:apk/alpine/botan?arch=source",
"ecosystem": "Alpine:v3.14"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2018-9860.json"
},
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{
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],
"package": {
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"purl": "pkg:apk/alpine/botan?arch=source",
"ecosystem": "Alpine:v3.15"
},
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"package": {
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"ecosystem": "Alpine:v3.16"
},
"database_specific": {
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],
"package": {
"name": "botan",
"purl": "pkg:apk/alpine/botan?arch=source",
"ecosystem": "Alpine:v3.17"
},
"database_specific": {
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},
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{
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],
"package": {
"name": "botan",
"purl": "pkg:apk/alpine/botan?arch=source",
"ecosystem": "Alpine:v3.18"
},
"database_specific": {
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},
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{
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}
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],
"package": {
"name": "botan",
"purl": "pkg:apk/alpine/botan?arch=source",
"ecosystem": "Alpine:v3.19"
},
"database_specific": {
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},
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{
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}
]
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],
"package": {
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"ecosystem": "Alpine:v3.20"
},
"database_specific": {
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},
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{
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{
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],
"package": {
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"ecosystem": "Alpine:v3.21"
},
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},
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}
],
"modified": "2026-10-23T17:17:55.311181023Z",
"provider": "osv",
"upstream": [
"CVE-2018-9860"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2018-9860"
]
},
"related_cves": [
{
"value": "CVE-2018-9860",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 415254,
"published_at": "2018-04-12T05:29:00.22+00:00"
}