TODDR YAML::Syck up to 1.46 Base64 Decoder syck_base64dec out-of-bounds

Summaryinfo

A vulnerability was found in TODDR YAML::Syck up to 1.46. It has been classified as problematic. The affected element is the function syck_base64dec of the component Base64 Decoder. Performing a manipulation results in out-of-bounds. This vulnerability is identified as CVE-2026-57075. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in TODDR YAML::Syck up to 1.46. It has been classified as problematic. This affects the function syck_base64dec of the component Base64 Decoder. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality. The summary by CVE is:

YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec. The base64 decoder in the bundled libsyck indexes the 256-entry static table b64_xtable with a signed char, so any !!binary byte >= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any !!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path. Any caller that runs Load or LoadFile on an untrusted document containing a !!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result.

It is possible to read the advisory at metacpan.org. This vulnerability is uniquely identified as CVE-2026-57075 since 06/23/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.47 eliminates this vulnerability.

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Productinfo

Vendor

• TODDR

Name

• YAML::Syck

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38
• 1.39
• 1.40
• 1.41
• 1.42
• 1.43
• 1.44
• 1.45
• 1.46

CPE 2.3info

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CPE 2.2info

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