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CVE-2026-4177— YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter

Quick assessment

Affected
TODDR YAML::Syck
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

YAML::Syck是CPAN Authors开源的一个Perl库。 YAML::Syck 1.36及之前版本存在安全漏洞，该漏洞源于YAML发射器中存在堆缓冲区溢出等问题，可能导致内存损坏或信息泄露。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
TODDR YAML::Syck ≤ 1.36 affected
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I. Basic Information for CVE-2026-4177

Vulnerability Information
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Vulnerability Title
YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter
Source: CVE Program / CVE List V5
Vulnerability Description
YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter. The heap overflow occurs when class names exceed the initial 512-byte allocation. The base64 decoder could read past the buffer end on trailing newlines. strtok mutated n->type_id in place, corrupting shared node data. A memory leak occurred in syck_hdlr_add_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
YAML::Syck 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
YAML::Syck是CPAN Authors开源的一个Perl库。 YAML::Syck 1.36及之前版本存在安全漏洞，该漏洞源于YAML发射器中存在堆缓冲区溢出等问题，可能导致内存损坏或信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TODDR YAML::Syck 0 ~ 1.36 -

II. Public POCs for CVE-2026-4177

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III. Intelligence Information for CVE-2026-4177

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Patches & Fixes for CVE-2026-4177 (1)

IV. Related Vulnerabilities

Same product: YAML::Syck
Same vendor: TODDR
Same weakness: CWE-122

V. Comments for CVE-2026-4177

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