CVE-2026-48959
IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward
Description
IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward. fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration. Extracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip->new($zip, Name => $target) drives a per-byte read loop scaling with the entry's compressed size, up to the non-Zip64 4 GiB cap.
INFO
Published Date :
May 27, 2026, 4:16 a.m.
Last Modified :
July 24, 2026, 12:10 p.m.
Remotely Exploit :
Yes !
Source :
9b29abf9-4ab0-4765-b253-1875cd9b441e
Affected Products
The following products are affected by CVE-2026-48959
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 IO::Uncompress::Unzip to version 2.220 or later.
- Apply relevant security patches to Perl modules.
- Review zip file processing for potential vulnerabilities.
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-2026-48959.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48959 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-2026-48959
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-2026-48959 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48959 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]
Jul. 24, 2026
Action Type Old Value New Value Changed Translation Title: IO::Uncompress::Unzip de PMQS, Description: Las versiones de IO::Uncompress::Unzip anteriores a la 2.220 para Perl permiten el agotamiento de la CPU a través de un bucle de lectura byte a byte en fastForward. fastForward() compara la longitud $offset (el recuento de dígitos del offset, de 1 a 19) contra el tamaño del fragmento $c en lugar de $offset mismo, por lo que $c se reduce de 16 KiB a 1-19 bytes por iteración. La extracción de una entrada con nombre de un archivo zip proporcionado por un atacante a través de IO::Uncompress::Unzip->new($zip, Name => $target) impulsa un bucle de lectura byte a byte que escala con el tamaño comprimido de la entrada, hasta el límite de 4 GiB no-Zip64. Title: IO::Uncompress::Unzip de PMQS, Description: Las versiones de IO::Uncompress::Unzip anteriores a la 2.220 para Perl permiten el agotamiento de la CPU a través de un bucle de lectura byte a byte en fastForward. fastForward() compara la longitud $offset (el recuento de dígitos del offset, de 1 a 19) contra el tamaño del fragmento $c en lugar de $offset mismo, por lo que $c se reduce de 16 KiB a 1-19 bytes por iteración. La extracción de una entrada con nombre de un archivo zip proporcionado por un atacante a través de IO::Uncompress::Unzip -> new($zip, Name => $target) impulsa un bucle de lectura byte a byte que escala con el tamaño comprimido de la entrada, hasta el límite de 4 GiB no-Zip64. -
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: IO::Uncompress::Unzip de PMQS, Description: Las versiones de IO::Uncompress::Unzip anteriores a la 2.220 para Perl permiten el agotamiento de la CPU a través de un bucle de lectura byte a byte en fastForward. fastForward() compara la longitud $offset (el recuento de dígitos del offset, de 1 a 19) contra el tamaño del fragmento $c en lugar de $offset mismo, por lo que $c se reduce de 16 KiB a 1-19 bytes por iteración. La extracción de una entrada con nombre de un archivo zip proporcionado por un atacante a través de IO::Uncompress::Unzip->new($zip, Name => $target) impulsa un bucle de lectura byte a byte que escala con el tamaño comprimido de la entrada, hasta el límite de 4 GiB no-Zip64. -
CVE Modified by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/pmqs/IO-Compress', 'vendor': 'PMQS', 'product': 'IO::Uncompress::Unzip', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.220', 'versionType': 'custom'}], 'packageName': 'IO-Compress', 'programFiles': ['lib/IO/Uncompress/Unzip.pm'], 'collectionURL': 'https://cpan.org/modules', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': 'IO::Uncompress::Unzip::fastForward'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-48959', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-29T15:50:09.916092Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 29, 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 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
May. 27, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/05/27/2 -
New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e
May. 27, 2026
Action Type Old Value New Value Added Description IO::Uncompress::Unzip versions before 2.220 for Perl allow CPU exhaustion via per-byte read loop in fastForward. fastForward() compares length $offset (the digit count of the offset, 1 to 19) against the chunk size $c instead of $offset itself, so $c shrinks from 16 KiB to 1-19 bytes per iteration. Extracting a named entry from an attacker supplied zip via IO::Uncompress::Unzip->new($zip, Name => $target) drives a per-byte read loop scaling with the entry's compressed size, up to the non-Zip64 4 GiB cap. Added CWE CWE-407 Added Reference https://github.com/pmqs/IO-Compress/commit/68db44076f4c1a86a2ffe53a958eac6cabaf72e2.patch Added Reference https://metacpan.org/release/PMQS/IO-Compress-2.220/changes