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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 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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:38750d2936830d917f23f9767435113e875c3d9451da8a6bfd4c490163037662
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-415","description":"CWE-415 Double Free","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:33bb36813d68e50e9209634bd3277ce243c21e151c8598a0312f2aa4e268715e · sha256:4112eac4dfa950f7… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-416","description":"CWE-416 Use After Free","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:33bb36813d68e50e9209634bd3277ce243c21e151c8598a0312f2aa4e268715e · sha256:4112eac4dfa950f7… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"YAML-Syck","product":"YAML::Syck","programFiles":["handler.c","syck_.c","syck.h"],"programRoutines":[{"name":"syck_hdlr_add_anchor"},{"name":"syck_hdlr_remove_anchor"},{"name":"syck_hdlr_add_node"}],"repo":"https://github.com/toddr/YAML-Syck","vendor":"TODDR","versions":[{"lessThan":"1.47","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:33bb36813d68e50e9209634bd3277ce243c21e151c8598a0312f2aa4e268715e · sha256:4112eac4dfa950f7… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":6.2,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:33bb36813d68e50e9209634bd3277ce243c21e151c8598a0312f2aa4e268715e · sha256:4112eac4dfa950f7… · /containers/adp/1/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-415","description":"CWE-415 Double Free","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:33bb36813d68e50e9209634bd3277ce243c21e151c8598a0312f2aa4e268715e · sha256:4112eac4dfa950f7… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-416","description":"CWE-416 Use After Free","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:33bb36813d68e50e9209634bd3277ce243c21e151c8598a0312f2aa4e268715e · sha256:4112eac4dfa950f7… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"http://www.openwall.com/lists/oss-security/2026/07/17/1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:33bb36813d68e50e9209634bd3277ce243c21e151c8598a0312f2aa4e268715e · sha256:4112eac4dfa950f7… · /containers/adp/0/references/0
{"tags":["patch"],"url":"https://github.com/toddr/YAML-Syck/commit/44c90a109ec3215ee7ce747bd11209835e123d8b.patch"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:33bb36813d68e50e9209634bd3277ce243c21e151c8598a0312f2aa4e268715e · sha256:4112eac4dfa950f7… · /containers/cna/references/1
{"tags":["release-notes"],"url":"https://metacpan.org/release/TODDR/YAML-Syck-1.47/changes"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:33bb36813d68e50e9209634bd3277ce243c21e151c8598a0312f2aa4e268715e · sha256:4112eac4dfa950f7… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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