CVE-2026-57077

A flaw was found in YAML::Syck. An out-of-bounds read vulnerability exists due to an unbounded newline scan during block-scalar lexing. A remote attacker could exploit this by providing a specially crafted YAML document, leading to potential information disclosure. This issue is an incomplete fix for a previously identified vulnerability.

Moderate: An out-of-bounds read flaw in perl-YAML-Syck can lead to information disclosure when processing specially crafted YAML documents. This vulnerability, an incomplete fix for CVE-2025-11683, occurs during block-scalar lexing if an application loads untrusted YAML input containing a block scalar at a document boundary.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this vulnerability, restrict applications using perl-YAML-Syck from processing untrusted YAML documents. Ensure that only trusted input sources are parsed by YAML::Syck. If perl-YAML-Syck is not required, consider removing the package to eliminate the exposure, noting that this may affect dependent applications.