MediumFix available
libyaml-syck-perl — security advisory
YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read The issue is seen with complex YAML files with a hash of all keys and empty values. There is no indication that the issue leads to accessing memory outside that allocated to the module.
- Products
- libyaml-syck-perl
- Affected versions
- 1.34-2, 1.34-3
- Fixed versions
- 1.34-2+deb12u1, 1.34-2+deb13u1, 1.34-4
- CVEs
- CVE-2025-11683
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 11:07 UTC · Revision 1
Source evidence
YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read The issue is seen with complex YAML files with a hash of all keys and empty values. There is no indication that the issue leads to accessing memory outside that allocated to the module.
osv:DEBIAN-CVE-2025-11683
libyaml-syck-perl
Fixed versions: 1.34-2+deb12u1
libyaml-syck-perl
Fixed versions: 1.34-2+deb13u1
libyaml-syck-perl
Fixed versions: 1.34-4
Complete source record
{
"id": "3464532f34f348f691f1a5739686e8ac107803248fdaafaacf24c94c67e6bbed",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-11683",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2025-11683",
"summary": "YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read The issue is seen with complex YAML files with a hash of all keys and empty values. There is no indication that the issue leads to accessing memory outside that allocated to the module.",
"evidence": "osv:DEBIAN-CVE-2025-11683",
"products": [
{
"name": {
"value": "libyaml-syck-perl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
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"evidence": "/affected/0/ranges"
}
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"affected_versions": [
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{
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"evidence": "/affected/1/versions"
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]
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{
"name": {
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"severity": "medium",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
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{
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"package": {
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"purl": "pkg:deb/debian/libyaml-syck-perl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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],
"database_specific": {
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
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{
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],
"package": {
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"purl": "pkg:deb/debian/libyaml-syck-perl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-11683.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
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{
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"package": {
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"purl": "pkg:deb/debian/libyaml-syck-perl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-11683.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-09T09:47:24.458770513Z",
"provider": "osv",
"upstream": [
"CVE-2025-11683"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2025-11683"
]
},
"related_cves": [
{
"value": "CVE-2025-11683",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 111466,
"published_at": "2025-10-16T01:15:32.89+00:00"
}