CVE catalog
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
- Severity
- High · CVSS 7.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.33% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libyaml-syck-perl | sid | 1.47-1 | fixed |
| Debian | libyaml-syck-perl | forky | 1.47-1 | fixed |
| Debian | libyaml-syck-perl | trixie | 1.34-2+deb13u3 | fixed |
| Debian | libyaml-syck-perl | trixie-security | 1.34-2+deb13u3 | fixed |
| Debian | libyaml-syck-perl | bookworm | 1.34-2+deb12u2 | vulnerable |
| Debian | libyaml-syck-perl | bookworm-security | 1.34-2+deb12u3 | fixed |
| Cpe | libyaml-syck-perl | Not reported | Not reported | vulnerable |
| Opensuse | perl-YAML-Syck | leap 16.0 | 1.450.0-bp160.2.1 | fixed |
| Opensuse | perl-YAML-Syck | tumbleweed | 1.450.0-4.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libyaml-syck-perl | source | sid | 1.36-3 | not yet assigned | Not reported | Not reported |
| Debian | libyaml-syck-perl | source | forky | 1.36-3 | not yet assigned | Not reported | Not reported |
| Debian | libyaml-syck-perl | source | trixie | 1.34-2+deb13u3 | not yet assigned | Not reported | Not reported |
| Debian | libyaml-syck-perl | source | bookworm | 1.34-2+deb12u3 | not yet assigned | Not reported | Not reported |
| Opensuse | perl-YAML-Syck | rpm | leap 16.0 | 1.450.0-bp160.2.1 | Not reported | OPENSUSE-SU-2026:20938-1 | Not reported |
| Opensuse | perl-YAML-Syck | rpm | tumbleweed | 1.450.0-4.1 | Not reported | OPENSUSE-SU-2026:10846-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libyaml-syck-perl]Affected
Details (4)
1.34-2+deb12u2· amd64 · bookwormAffected · Fixed:
1.34-2+deb12u3nvd · libyaml-syck-perl · debian · bookworm; nvd · libyaml-syck-perl · debian · 12
1.34-2+deb12u2· arm64 · bookwormAffected · Fixed:
1.34-2+deb12u3nvd · libyaml-syck-perl · debian · bookworm; nvd · libyaml-syck-perl · debian · 12
1.34-2+deb12u3· amd64 · bookworm-securityFixed · Fixed:
1.34-2+deb12u3nvd · libyaml-syck-perl · debian · bookworm; nvd · libyaml-syck-perl · debian · 12
1.34-2+deb12u3· arm64 · bookworm-securityFixed · Fixed:
1.34-2+deb12u3nvd · libyaml-syck-perl · debian · bookworm; nvd · libyaml-syck-perl · debian · 12
[Debian 13 (Trixie)]
- [libyaml-syck-perl]Affected
Details (5)
1.34-2+deb13u2· amd64 · trixieAffected · Fixed:
1.34-2+deb13u3nvd · libyaml-syck-perl · debian · 13
1.34-2+deb13u2· arm64 · trixieAffected · Fixed:
1.34-2+deb13u3nvd · libyaml-syck-perl · debian · 13
1.34-2+deb13u2· amd64 · trixie-security · Historical versionAffected · Fixed:
1.34-2+deb13u3nvd · libyaml-syck-perl · debian · 13
1.34-2+deb13u3· amd64 · trixie-securityFixed · Fixed:
1.34-2+deb13u3nvd · libyaml-syck-perl · debian · 13
1.34-2+deb13u3· arm64 · trixie-securityFixed · Fixed:
1.34-2+deb13u3nvd · libyaml-syck-perl · debian · 13
[openSUSE Tumbleweed]
- [perl-YAML-Syck]Fixed
Source package: [perl-YAML-Syck]
Details (1)
1.470.0-1.3· x86_64 · tumbleweedFixed · Fixed:
1.450.0-4.1nvd · perl-YAML-Syck · opensuse · tumbleweed
Observed:
References
- [http://www.openwall.com/lists/oss-security/2026/05/12/16]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10846-1.json]
- [https://github.com/cpan-authors/YAML-Syck/commit/208a4d3bd1b5cdb4a791a6e3905bd6bd45e9d005.patch]
- [https://github.com/cpan-authors/YAML-Syck/issues/132]
- [https://github.com/cpan-authors/YAML-Syck/pull/133]
- [https://metacpan.org/release/TODDR/YAML-Syck-1.38/changes]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-5089]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-5089]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10846-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:20938-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-5089]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5089.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]