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Change History

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

https://github.com/cpan-authors/YAML-Syck/issues/132

http://www.openwall.com/lists/oss-security/2026/05/12/16

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.

CWE-124

https://github.com/cpan-authors/YAML-Syck/commit/208a4d3bd1b5cdb4a791a6e3905bd6bd45e9d005.patch

https://github.com/cpan-authors/YAML-Syck/issues/132

https://github.com/cpan-authors/YAML-Syck/pull/133

https://metacpan.org/release/TODDR/YAML-Syck-1.38/changes