CVE-2026-77781
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.
INFO
Published Date :
Aug. 22, 2026, 12:16 a.m.
Last Modified :
Oct. 15, 2026, 7:10 p.m.
Remotely Exploit :
Yes !
Source :
9b29abf9-4ab0-4765-b253-1875cd9b441e
Affected Products
The following products are affected by CVE-2026-77781
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update Tie::Hash::Regex to version 2.0.0 or later.
- Avoid using unparseable keys with the module.
- Implement input validation for lookup keys.
- Use eval guards for regex compilation.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-77781.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-77781 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-77781
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-77781 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-77781 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 15, 2026
Action Type Old Value New Value Added Translation Title: Tie::Hash::Regex, Description: Las versiones de Tie::Hash::Regex anteriores a la 2.0.0 para Perl lanzarán una excepción en claves de búsqueda no analizables. Los métodos FETCH, EXISTS y DELETE lanzan una excepción cuando se encuentran con expresiones regulares mal formadas. Cada método recurre a una coincidencia de expresión regular cuando la clave no está ya almacenada en el hash, compilando la clave del llamador con un qr// “desnudo” y sin protección de eval. Una clave que no es un patrón de expresión regular válido, como un solo corchete sin cerrar, muere. Una aplicación que busca cadenas suministradas externamente en un hash ligado morirá con una clave inválida. -
CVE Modified by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Aug. 27, 2026
Action Type Old Value New Value Added Reference https://github.com/davorg-cpan/tie-hash-regex/commit/4239732cb76233543e2ded8ff5e0f238af152e0c.patch Added Reference https://metacpan.org/release/DAVECROSS/Tie-Hash-Regex-2.0.0/source/Changes Removed Reference https://github.com/davorg-cpan/tie-hash-regex/commit/4239732cb76233543e2ded8ff5e0f238af152e0c.patch Removed Reference https://metacpan.org/release/DAVECROSS/Tie-Hash-Regex-2.0.0/source/Changes -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added SSVC {'id': 'CVE-2026-77781', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-27T19:12:36.613814Z'} -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Aug. 27, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/08/22/2 Removed Reference http://www.openwall.com/lists/oss-security/2026/08/22/2 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Aug. 22, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/08/22/2 -
New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/davorg-cpan/tie-hash-regex', 'modules': ['Tie::Hash::Regex'], 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.0.0', 'versionType': 'custom'}], 'packageURL': 'pkg:cpan/Tie-Hash-Regex', 'packageName': 'Tie-Hash-Regex', 'programFiles': ['lib/Tie/Hash/Regex.pm'], 'collectionURL': 'https://cpan.org/modules', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': 'Tie::Hash::Regex::FETCH'}, {'name': 'Tie::Hash::Regex::EXISTS'}, {'name': 'Tie::Hash::Regex::DELETE'}]}] Added 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. Added CWE CWE-248 Added Reference https://github.com/davorg-cpan/tie-hash-regex/commit/4239732cb76233543e2ded8ff5e0f238af152e0c.patch Added Reference https://metacpan.org/release/DAVECROSS/Tie-Hash-Regex-2.0.0/source/Changes