Fedora NextCloud Update Addresses JSON Tampering and DoS Vulnerabilities

Linuxsecurity

Fedora NextCloud Update Addresses JSON Tampering and DoS Vulnerabilities

First seen 5 Jun 2026, 12:10 UTC • •72.0

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ThreatCluster •June 6, 2026 at 11:53 UTC

•Two critical vulnerabilities in NextCloud require immediate updates to version 33.0.4.
•CVE-2026-42044 allows JSON response tampering via Axios, posing security risks.
•CVE-2026-44167 enables denial of service through untrusted ASN.1 file loading.

On June 5, 2026, Fedora released updates for NextCloud addressing two critical vulnerabilities: CVE-2026-42044 and CVE-2026-44167. CVE-2026-42044 involves JSON response tampering via prototype pollution in Axios, while CVE-2026-44167 allows denial of service through untrusted ASN.1 file loading in phpseclib. Both vulnerabilities affect NextCloud versions prior to 33.0.4. Users are advised to upgrade to version 33.0.4 to mitigate these risks. The vulnerabilities were published on April 24 and May 12, 2026, respectively. The updates can be installed using the 'dnf' package manager. Immediate action is recommended to prevent potential exploitation.

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Timeline

2026-04-24

CVE-2026-42044 published

NextCloud vulnerability discovered allowing JSON response tampering via Axios.

2026-05-12

CVE-2026-44167 published

NextCloud vulnerability identified enabling denial of service through ASN.1 file loading.

2026-06-05

Fedora releases updates for NextCloud

Fedora advises users to upgrade to NextCloud version 33.0.4 to address critical vulnerabilities.

More articles in this cluster (2)

Threat Graph

9 entities, 14 inferred relationships (STIX 2.1).

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Technique (1)

Denial of Service

Organization (1)

Fedora

Vulnerability (3)

CVE-2026-42044
CVE-2026-44167
Prototype Pollution

Weakness (1)

Cwe-502 - Deserialization Of Untrusted Data

Affected Platform (3)

Axios
Nextcloud
Phpseclib

Relationships

CVE-2026-42044 targets Axios
CVE-2026-42044 targets Nextcloud
CVE-2026-42044 targets Phpseclib
CVE-2026-44167 targets Axios
CVE-2026-44167 targets Nextcloud
CVE-2026-44167 targets Phpseclib
Prototype Pollution targets Axios
Prototype Pollution targets Nextcloud
Prototype Pollution targets Phpseclib
Denial of Service targets Axios
Denial of Service targets Nextcloud
Denial of Service targets Phpseclib
CVE-2026-42044 related to Fedora
CVE-2026-42044 related to Cwe-502 - Deserialization Of Untrusted Data

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