Search threats, CVEs… ⌘K
Back to vendor advisories
Microsoft Security Response CenterCVE-2026-13221

Perl versions through 5.43.9 produce silently incorrect regular expression matches when an alternation of more than 65535 fixed string branches is compiled into a trie in Perl_study_chunk

Mariner

Read the vendor bulletin Get alerts for azl3 perl 5.38.2-512 on Azure Linux
4.0CVSS out of 10Medium severity
Scope

What the vendor says is affected

  • azl3 perl 5.38.2-512 on Azure Linux 3.0

Versions the vendor lists as fixed

  • 5.38.2-513
Next step

What the vendor recommends

CBL-Mariner Releases

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-13221View CVSS, KEV, EPSS, and threat context
Keep investigating
See every advisory from this vendor