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CVE-2026-77781

7.5 · HIGH

Tie::Hash::Regex versions before 2.0.0 for Perl will throw an exception on unparseable lookup keys.

Published Aug 22, 2026CWE-248EPSS 0.61%

Overview

CVE-2026-77781 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/davorg-cpan/tie-hash-regex/commit/4239732cb76233543e2ded8ff5e0f238af152e0c.patchRefmetacpan.org/release/DAVECROSS/Tie-Hash-Regex-2.0.0/source/ChangesRefwww.openwall.com/lists/oss-security/2026/08/22/2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-77781?

CVE-2026-77781 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-77781?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-77781?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-77781?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-77781 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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