CVE-2026-77781

Application crash via unguarded lookup-key regex compilation

Published Aug 21, 2026 · Updated Aug 22, 2026

Uncaught exceptions in Tie::Hash::Regex before 2.0.0 allow attackers to crash consuming Perl applications with malformed lookup keys. FETCH, EXISTS, and DELETE compile a missing caller-supplied key as a regular expression without an eval guard, so a syntax error propagates as a fatal exception. The application must pass externally supplied text into an affected tied-hash operation; the resulting exception terminates the current unprotected process or worker.

CVSS severityUnavailable
Unscored
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exceptions in Tie::Hash::Regex before 2.0.0 allow attackers to crash consuming Perl applications with malformed lookup keys. FETCH, EXISTS, and DELETE compile a missing caller-supplied key as a regular expression without an eval guard, so a syntax error propagates as a fatal exception. The application must pass externally supplied text into an affected tied-hash operation; the resulting exception terminates the current unprotected process or worker.

The record

CVE
CVE-2026-77781
Published
Aug 21, 2026
Updated
Aug 22, 2026
Vendor
Magnum Solutions Ltd.
Product
Tie::Hash::Regex
Classifications
CWE-248, T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0 <2.0.0

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Magnum Solutions Ltd. · Tie::Hash::Regexversion=0 <2.0.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

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Technologies

Your stack

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Your stack

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