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Message-ID: <73b6423d-7b32-435d-9501-e6db2cc15102@cpansec.org>
Date: Sat, 22 Aug 2026 00:59:05 +0100
From: Robert Rothenberg <rrwo@...nsec.org>
To: cve-announce@...urity.metacpan.org, oss-security@...ts.openwall.com
Subject: CVE-2026-77781: Tie::Hash::Regex versions before 2.0.0 for Perl will
throw an exception on unparseable lookup keys
========================================================================
CVE-2026-77781 CPAN Security Group
========================================================================
CVE ID: CVE-2026-77781
Distribution: Tie-Hash-Regex
Versions: before 2.0.0
MetaCPAN: https://metacpan.org/dist/Tie-Hash-Regex
VCS Repo: https://github.com/davorg-cpan/tie-hash-regex
Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception
on unparseable lookup keys
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.
Problem types
-------------
- CWE-248 Uncaught Exception
Workarounds
-----------
For deployments that cannot be upgraded, ensure that calls to check the
existence of keys, fetch values from keys or delete keys are wrapped in
an eval block.
Solutions
---------
Upgrade to Tie::Hash::Regex version 2.0.0 or later.
References
----------
https://metacpan.org/release/DAVECROSS/Tie-Hash-Regex-2.0.0/source/Changes
https://github.com/davorg-cpan/tie-hash-regex/commit/4239732cb76233543e2ded8ff5e0f238af152e0c.patch
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