Summary
Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-5089: 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.
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | perl-YAML-Syck | 0:1.27-3.amzn2.0.5 |
| Amazon Linux · 2 | perl-YAML-Syck-debuginfo | 0:1.27-3.amzn2.0.5 |
Vulnerabilities 1
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High 7.3
YAML::Syck versions before 1.38 for Perl has an out-of-bounds read
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 (…
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-5089.html