CVE-2026-48961
IO::Compress versions from 2.207 before 2.220 for Perl ship a zipdetails CLI tool that crashes with undefined subroutine on Info-ZIP Unix Extra Field with 8-byte UID or GID
Description
IO::Compress versions from 2.207 before 2.220 for Perl ship a zipdetails CLI tool that crashes with undefined subroutine on Info-ZIP Unix Extra Field with 8-byte UID or GID. When decode_ux() in bin/zipdetails handles an Info-ZIP Unix Extra Field (tag 0x7875) with UID Size or GID Size set to 8, causing zipdetails to decode an 8-byte UID or GID value, it dispatches through decodeLitteEndian(), which calls a misnamed helper unpackValueQ. The actual function defined in the same file is unpackValue_Q (with underscore); the call raises 'Undefined subroutine &main::unpackValueQ' and the script exits with status 255. Library callers of IO::Compress and IO::Uncompress are not affected; the defect is in the bundled CLI tool.
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-2026-48961
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::Compress to version 2.220 or later.
- Verify the zipdetails tool is updated.
- Ensure proper handling of extra field data.
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-2026-48961.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48961 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-2026-48961
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-2026-48961 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48961 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.
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CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Changed Translation Title: IO::Compress de PMQS, Description: Las versiones de IO::Compress desde la 2.207 anteriores a la 2.220 para Perl distribuyen una herramienta CLI zipdetails que falla con subrutina indefinida en el campo extra Unix de Info-ZIP con UID o GID de 8 bytes. Cuando decode_ux() en bin/zipdetails maneja un campo extra Unix de Info-ZIP (etiqueta 0x7875) con el tamaño de UID o el tamaño de GID establecido en 8, lo que hace que zipdetails decodifique un valor UID o GID de 8 bytes, se despacha a través de decodeLitteEndian(), que llama a una función auxiliar mal nombrada unpackValueQ. La función real definida en el mismo archivo es unpackValue_Q (con guion bajo); la llamada genera 'Undefined subroutine &main::unpackValueQ' y el script sale con estado 255. Los llamadores de biblioteca de IO::Compress y IO::Uncompress no se ven afectados; el defecto está en la herramienta CLI incluida. Title: IO::Compress de PMQS, Description: Las versiones de IO::Compress desde la 2.207 anteriores a la 2.220 para Perl distribuyen una herramienta CLI zipdetails que falla con subrutina indefinida en el campo extra Unix de Info-ZIP con UID o GID de 8 bytes. Cuando decode_ux() en bin/zipdetails maneja un campo extra Unix de Info-ZIP (etiqueta 0x7875) con el tamaño de UID o el tamaño de GID establecido en 8, lo que hace que zipdetails decodifique un valor UID o GID de 8 bytes, se despacha a través de decodeLitteEndian(), que llama a una función auxiliar mal nombrada unpackValueQ. La función real definida en el mismo archivo es unpackValue_Q (con guion bajo); la llamada genera 'Undefined subroutine &main::unpackValueQ' y el script sale con estado 255. Los llamadores de biblioteca de IO::Compress y IO::Uncompress no se ven afectados; el defecto está en la herramienta CLI incluida. -
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: IO::Compress de PMQS, Description: Las versiones de IO::Compress desde la 2.207 anteriores a la 2.220 para Perl distribuyen una herramienta CLI zipdetails que falla con subrutina indefinida en el campo extra Unix de Info-ZIP con UID o GID de 8 bytes. Cuando decode_ux() en bin/zipdetails maneja un campo extra Unix de Info-ZIP (etiqueta 0x7875) con el tamaño de UID o el tamaño de GID establecido en 8, lo que hace que zipdetails decodifique un valor UID o GID de 8 bytes, se despacha a través de decodeLitteEndian(), que llama a una función auxiliar mal nombrada unpackValueQ. La función real definida en el mismo archivo es unpackValue_Q (con guion bajo); la llamada genera 'Undefined subroutine &main::unpackValueQ' y el script sale con estado 255. Los llamadores de biblioteca de IO::Compress y IO::Uncompress no se ven afectados; el defecto está en la herramienta CLI incluida. -
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::Compress', 'versions': [{'status': 'affected', 'version': '2.207', 'lessThan': '2.220', 'versionType': 'custom'}], 'packageName': 'IO-Compress', 'programFiles': ['bin/zipdetails'], 'collectionURL': 'https://cpan.org/modules', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': 'main::decode_ux'}, {'name': 'main::decodeLitteEndian'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-48961', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-29T15:51:41.495552Z'} -
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:L/I:L/A:L -
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/2026/05/27/3 -
New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e
May. 27, 2026
Action Type Old Value New Value Added Description IO::Compress versions from 2.207 before 2.220 for Perl ship a zipdetails CLI tool that crashes with undefined subroutine on Info-ZIP Unix Extra Field with 8-byte UID or GID. When decode_ux() in bin/zipdetails handles an Info-ZIP Unix Extra Field (tag 0x7875) with UID Size or GID Size set to 8, causing zipdetails to decode an 8-byte UID or GID value, it dispatches through decodeLitteEndian(), which calls a misnamed helper unpackValueQ. The actual function defined in the same file is unpackValue_Q (with underscore); the call raises 'Undefined subroutine &main::unpackValueQ' and the script exits with status 255. Library callers of IO::Compress and IO::Uncompress are not affected; the defect is in the bundled CLI tool. Added CWE CWE-755 Added Reference https://github.com/pmqs/IO-Compress/commit/33c89d03d6e746ed2ead4f2f6570d47864c61bc7.patch Added Reference https://metacpan.org/release/PMQS/IO-Compress-2.220/changes