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CVE-2026-5089— YAML::Syck versions before 1.38 for Perl has an out-of-bounds read

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 1.38之前版本存在安全漏洞，该漏洞源于perl_syck.h中的base60解析代码存在缓冲区下溢，在处理冒号分隔值的最左段时，内部while循环可能将指针递减到字符串缓冲区起始位置之前，导致越界读取。

AI Predicted 5.3 Difficulty: Easy EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
TODDR YAML::Syck < 1.38 affected
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I. Basic Information for CVE-2026-5089

Vulnerability Information
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Vulnerability Title
YAML::Syck versions before 1.38 for Perl has an out-of-bounds read
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区下溢
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 1.38之前版本存在安全漏洞，该漏洞源于perl_syck.h中的base60解析代码存在缓冲区下溢，在处理冒号分隔值的最左段时，内部while循环可能将指针递减到字符串缓冲区起始位置之前，导致越界读取。
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 ~ 1.38 -

II. Public POCs for CVE-2026-5089

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III. Intelligence Information for CVE-2026-5089

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Patches & Fixes for CVE-2026-5089 (2)

News Coverage for CVE-2026-5089 (1)

Other References for CVE-2026-5089 (1)

IV. Related Vulnerabilities

Same product: YAML::Syck
Same vendor: TODDR
Same weakness: CWE-124

V. Comments for CVE-2026-5089

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