CVE intelligence and bounded remediation

CVE-2024-34535 — In Mastodon 4.1.6, API endpoint rate limiting can be bypassed by setting a crafted HTTP request header

Medium CVSS 5.9

In Mastodon 4.1.6, API endpoint rate limiting can be bypassed by setting a crafted HTTP request header.

Severity
Medium
CVSS
5.9 (3.1)
Published
2024-10-03
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-444

Affected products

  • joinmastodon / mastodon

Showing 1 representative product identities from 2 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

HTTP request smuggling and message-boundary ambiguity

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Check exposure

  • Inventory every proxy, CDN, gateway, load balancer, service mesh, and application server hop on affected request paths.
  • Compare documented parsing and normalization behavior for message length, transfer coding, duplicate headers, and protocol translation.
  • Identify connection reuse and which downstream services trust headers added by intermediaries.

Remediate safely

  • Update affected intermediaries and origin servers and align them on a single standards-compliant request framing policy.
  • Reject ambiguous length, transfer-coding, duplicate, malformed, and unsupported framing before forwarding.
  • Normalize or remove hop-by-hop and identity headers at one controlled boundary and add multi-hop regression tests.

Authoritative sources

Complete CVE record and remediation plan

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