CVE-2026-13713Public exploit

Interpreter crash via anchor-node double free

Published Jul 16, 2026 · Updated Jul 16, 2026

Use-after-free in bundled libsyck in Todd Rinaldo YAML::Syck before 1.47 allows attackers to crash Perl via a crafted YAML document. On anchor redefinition or removal, syck_hdlr_add_anchor and syck_hdlr_remove_anchor free a node that remains on the parser value stack, and syck_hdlr_add_node frees it again. The default Load and LoadFile paths require no special flags; any application parsing the seven-byte trigger from an untrusted source terminates its interpreter.

CVSS severity6.2
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in bundled libsyck in Todd Rinaldo YAML::Syck before 1.47 allows attackers to crash Perl via a crafted YAML document. On anchor redefinition or removal, syck_hdlr_add_anchor and syck_hdlr_remove_anchor free a node that remains on the parser value stack, and syck_hdlr_add_node frees it again. The default Load and LoadFile paths require no special flags; any application parsing the seven-byte trigger from an untrusted source terminates its interpreter.

The record

CVE
CVE-2026-13713
Published
Jul 16, 2026
Updated
Jul 16, 2026
Vendor
Todd Rinaldo
Product
YAML::Syck
Classifications
CWE-415, CWE-416, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.47

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Todd Rinaldo · YAML::Syckversion=0 <1.47

Published CVSS scores

6.2CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-415Double Free
CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

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Technologies

Your stack

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Your stack

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