What’s Vulnerable › Vulnerabilities

CVE-2026-77781: Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable lookup keys

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-22 · updated 2026-10-15
• Weakness: CWE-248

Description

Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable lookup keys. The FETCH, EXISTS and DELETE methods throw an exception when on malformed regular expressions. Each method falls back to a regex match when the key is not already stored in the hash, compiling the caller's key with a bare qr// and no eval guard. A key that is not a valid regular expression pattern, such as a single unmatched bracket, dies. An application that looks up externally supplied strings in a tied hash will die on an invalid key.

References

• https://github.com/davorg-cpan/tie-hash-regex/commit/4239732cb76233543e2ded8ff5e0f238af152e0c.patch
• https://metacpan.org/release/DAVECROSS/Tie-Hash-Regex-2.0.0/source/Changes
• http://www.openwall.com/lists/oss-security/2026/08/22/2

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