DEBIAN-CVE-2026-5089
YAML::Syck versions before 1.38 for Perl has an out-of-bounds read. The base60 (sexagesimal) parsing code in perl_syck.h has a buffer underflow bug in both int#base60 and float#base60 handlers. When processing the leftmost segment of a colon-separated value (e.g., the 1 in 1:30:45), the inner while loop can decrement a pointer past the start of the string buffer: while ( colon >= ptr && *colon != ':' ) { colon--; } if ( *colon == ':' ) *colon = '\0'; // colon may be ptr-1 here When no colon is found (final/leftmost segment), colon becomes ptr-1, and the subsequent *colon dereference reads one byte before the allocated buffer.
DEBIAN-CVE-2026-5089
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-5089
libyaml-syck-perl
Source reference: /affected/0/package/name
- Affected versions
- 1.34-2
Source reference:
/affected/0/versions1.34-2+deb12u1Source reference:
/affected/0/versions1.34-2+deb12u2Source reference:
/affected/0/versions - Fixed versions
- 1.34-2+deb12u3
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
libyaml-syck-perl
Source reference: /affected/1/package/name
- Affected versions
- 1.34-2
Source reference:
/affected/1/versions1.34-2+deb13u1Source reference:
/affected/1/versions1.34-2+deb13u2Source reference:
/affected/1/versions - Fixed versions
- 1.34-2+deb13u3
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
libyaml-syck-perl
Source reference: /affected/2/package/name
- Affected versions
- 1.34-2
Source reference:
/affected/2/versions1.34-3Source reference:
/affected/2/versions1.34-4Source reference:
/affected/2/versions1.36-1Source reference:
/affected/2/versions1.36-2Source reference:
/affected/2/versions - Fixed versions
- 1.36-3
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.34-2+deb12u3"
}
]
}
],
"package": {
"name": "libyaml-syck-perl",
"purl": "pkg:deb/debian/libyaml-syck-perl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.34-2",
"1.34-2+deb12u1",
"1.34-2+deb12u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5089.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.34-2+deb13u3"
}
]
}
],
"package": {
"name": "libyaml-syck-perl",
"purl": "pkg:deb/debian/libyaml-syck-perl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.34-2",
"1.34-2+deb13u1",
"1.34-2+deb13u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5089.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.36-3"
}
]
}
],
"package": {
"name": "libyaml-syck-perl",
"purl": "pkg:deb/debian/libyaml-syck-perl?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.34-2",
"1.34-3",
"1.34-4",
"1.36-1",
"1.36-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5089.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57249 · Revision 1
- Added to Heist Feed
- Publisher date