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CVE-2026-57077— YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len

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.

toddr YAML::Syck是toddr个人开发者的Perl语言模块,用于解析和生成YAML格式数据。 toddr YAML::Syck 1.47之前版本存在缓冲区错误漏洞，该漏洞源于在newline_len函数中未对换行符扫描进行边界检查，导致越界读取。

AI Predicted 7.5 Difficulty: Easy EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
TODDR YAML::Syck < 1.47 affected
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I. Basic Information for CVE-2026-57077

Vulnerability Information
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Vulnerability Title
YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len
Source: CVE Program / CVE List V5
Vulnerability Description
YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len. In the bundled libsyck newline_len and is_newline dereference the scan pointer, and the following byte for a "\r\n" pair, with no NUL-terminator or bounds check. During block-scalar lexing at a document boundary the scan runs one byte past the heap lexer buffer. This is an incomplete fix of CVE-2025-11683, on a lexer path the earlier fix did not cover. Any caller that runs Load or LoadFile on an untrusted document with a block scalar at a document boundary reaches the over-read.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
toddr YAML::Syck 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
toddr YAML::Syck是toddr个人开发者的Perl语言模块,用于解析和生成YAML格式数据。 toddr YAML::Syck 1.47之前版本存在缓冲区错误漏洞，该漏洞源于在newline_len函数中未对换行符扫描进行边界检查，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 ~ 1.47 -

II. Public POCs for CVE-2026-57077

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III. Intelligence Information for CVE-2026-57077

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Patches & Fixes for CVE-2026-57077 (1)

Other References for CVE-2026-57077 (1)

Same Patch Batch · TODDR · 2026-07-16 · 4 CVEs total

CVE-2026-13713 YAML::Syck versions before 1.47 for Perl allow a use-after-free and double-free via an anc
CVE-2026-57075 YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char loo
CVE-2026-57076 YAML::Syck versions before 1.47 for Perl allow a heap use-after-free via an anchor name re

IV. Related Vulnerabilities

Same product: YAML::Syck
Same vendor: TODDR
Same weakness: CWE-125

V. Comments for CVE-2026-57077

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