MidnightBSD mport up to 2.7.7 Zstd Decompression libmport/util.c mport_decompress_zstd denial of service

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.41+

Summaryinfo

A vulnerability marked as problematic has been reported in MidnightBSD mport up to 2.7.7. The affected element is the function mport_decompress_zstd of the file libmport/util.c of the component Zstd Decompression. Performing a manipulation results in denial of service. This vulnerability is cataloged as CVE-2026-54580. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in MidnightBSD mport up to 2.7.7. It has been classified as problematic. This affects the function mport_decompress_zstd of the file libmport/util.c of the component Zstd Decompression. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on integrity, and availability. The summary by CVE is:

mport is the MidnightBSD Package Manager. Prior to 2.7.8, libmport/util.c did not make every truncated, corrupt, or failed zstd stream fatal in mport_decompress_zstd(), and libmport/fetch.c did not consistently propagate those failures to index-fetch callers. A malicious or faulty mirror could supply compressed package index data that caused ZSTD_decompressStream() or an output write to fail while leaving partial index output available for later use, resulting in package-index integrity loss or denial of service. This issue is fixed in version 2.7.8.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-54580 since 06/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 2.7.8 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.4
VulDB Temp Score: 5.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: mport 2.7.8

Timelineinfo

06/15/2026 CVE reserved
09/17/2026 +94 days Advisory disclosed
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-54580 (🔒)
GCVE (CVE): GCVE-0-2026-54580
GCVE (VulDB): GCVE-100-406599

Entryinfo

Created: 09/17/2026 19:13
Changes: 09/17/2026 19:13 (69)
Complete: 🔍
Cache ID: 216::103

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