CVE catalog
CVE-2026-13713
YAML::Syck versions before 1.47 for Perl allow a use-after-free and double-free via an anchor node freed while still on the parser value stack. In the bundled libsyck, when an anchor name is redefine
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.18% · Oct 25, 2026
YAML::Syck versions before 1.47 for Perl allow a use-after-free and double-free via an anchor node freed while still on the parser value stack. In the bundled libsyck, when an anchor name is redefined or removed, syck_hdlr_add_anchor and syck_hdlr_remove_anchor free the node stored under that name with syck_free_node. That node can still be live on the parser's value stack, so syck_hdlr_add_node reaches it again and frees it a second time. On a normal build the 48-byte node chunk is freed twice and the interpreter aborts. Anchors need no special flags, so this is reached on the default Load path, and a 7-byte document that redefines an anchor triggers it. Any caller that runs Load or LoadFile on an untrusted document that redefines an anchor mid-parse crashes the interpreter, a denial of service.
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 |
| Alpine | perl-yaml-syck | 3.24 | 1.47-r0 | fixed |
| Opensuse | perl-YAML-Syck | tumbleweed | 1.470.0-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libyaml-syck-perl | source | sid | 1.47-1 | not yet assigned | Not reported | [1142267] |
| Debian | libyaml-syck-perl | source | forky | 1.47-1 | not yet assigned | Not reported | [1142267] |
| Debian | libyaml-syck-perl | source | trixie | 1.34-2+deb13u3 | not yet assigned | Not reported | [1142267] |
| Debian | libyaml-syck-perl | source | bookworm | 1.34-2+deb12u3 | not yet assigned | Not reported | [1142267] |
| Alpine | perl-yaml-syck | apk | 3.24 | 1.47-r0 | Not reported | ALPINE-CVE-2026-13713 | Not reported |
| Opensuse | perl-YAML-Syck | rpm | tumbleweed | 1.470.0-1.1 | Not reported | OPENSUSE-SU-2026:11299-1 | 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:
1.470.0-1.1nvd · perl-YAML-Syck · opensuse · tumbleweed
Observed:
References
- [http://www.openwall.com/lists/oss-security/2026/07/17/1]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11299-1.json]
- [https://github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d8b.patch]
- [https://metacpan.org/release/TODDR/YAML-Syck-1.47/changes]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-13713]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-13713]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-13713]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11299-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-13713]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13713.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2508.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]