Critical Security Bypass in Python-Starlette Affects Fedora 43 and 44

Linuxsecurity

Critical Security Bypass in Python-Starlette Affects Fedora 43 and 44

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

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ThreatCluster •June 6, 2026 at 11:53 UTC

•CVE-2026-48710 allows security bypass via malformed HTTP Host header.
•Fedora 43 and 44 are both affected, requiring immediate patching.
•Updates can be installed using 'dnf' with specific advisory commands.

A critical security vulnerability, CVE-2026-48710, has been identified in Python-Starlette, affecting Fedora 43 and 44. The flaw allows a security restriction bypass via a malformed HTTP Host header. Systems running these versions are at risk, as the vulnerability could enable unauthorized access. The CVE was published on May 26, 2026, with a proof of concept released earlier on April 1, 2026. Users are urged to apply updates immediately to mitigate potential exploitation. The updates can be installed using the 'dnf' package manager with specific advisory commands provided in the articles. Both Fedora 43 and 44 users should prioritize this patch to secure their systems against potential attacks.

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Timeline

2026-04-01

First public PoC for CVE-2026-48710

A proof of concept for the vulnerability was released, demonstrating the exploit method.

2026-05-26

CVE-2026-48710 published

The vulnerability was officially published, detailing the security bypass issue in Python-Starlette.

2026-06-05

Security updates released for Fedora 43 and 44

Fedora released updates to address the critical security bypass vulnerability in Python-Starlette.

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Threat Graph

4 entities, 3 inferred relationships (STIX 2.1).

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Technique (1)

Zero-day Exploit

Organization (1)

Fedora

Vulnerability (1)

CVE-2026-48710

Affected Platform (1)

Linux

Relationships

CVE-2026-48710 targets Linux
Zero-day Exploit targets Linux
CVE-2026-48710 related to Fedora

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