CVE-2026-5089— YAML::Syck versions before 1.38 for Perl has an out-of-bounds read
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
缓冲区下溢
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/cpan-authors/YAML-Syck/pull/133issue-tracking
- https://github.com/cpan-authors/YAML-Syck/issues/132issue-tracking
- https://nvd.nist.gov/vuln/detail/CVE-2026-5089
IV. Related Vulnerabilities
Same vendor: TODDR
Same weakness: CWE-124
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Libssh: libssh: denial of service via zero-length input in s - CVE-2026-20104
Cisco多款产品 安全漏洞 - CVE-2026-28419
Vim has Heap-based Buffer Underflow in Emacs tags parsing
V. Comments for CVE-2026-5089
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