CVE-2026-34148 | Fedify affected by resource exhaustion caused by unbounded redirect following during remote key/document resolution

Exp

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to 1.9.6, 1.10.5, 2.0.8, and 2.1.1, @fedify/fedify follows HTTP redirects recursively in its remote document loader and authenticated document loader without enforcing a maximum redirect count or visited-URL loop detection. An attacker who controls a remote ActivityPub key or actor URL can force a server using Fedify to make repeated outbound requests from a single inbound request, leading to resource consumption and denial of service. This vulnerability is fixed in 1.9.6, 1.10.5, 2.0.8, and 2.1.1.

Published: 2026-04-06 Last update: 2026-04-25 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-34148 is rated High Exploit Risk (60/100): CVSS High severity, with low exploitation likelihood (EPSS 0.55%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-34148

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-34148

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.06% 0.55% +0.49%
2 2026-04-12 0.04% 0.06% +0.02%
3 2026-04-07 — 0.04% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-34148

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-34148

GitHub Security Advisory for CVE-2026-34148

GHSA-gm9m-gwc4-hwgp · Severity: high · Ecosystem: npm — Fedify affected by resource exhaustion caused by unbounded redirect following during remote key/document resolution

Affected software / configurations for CVE-2026-34148

Vendor Product Version Raw CPE
fedify fedify\/fedify < 1.9.6 cpe:2.3:a:fedify:fedify\/fedify:*:*:*:*:*:node.js:*:*
fedify fedify\/fedify >= 1.10.0, < 1.10.5 cpe:2.3:a:fedify:fedify\/fedify:*:*:*:*:*:node.js:*:*
fedify fedify\/fedify >= 2.0.0, < 2.0.8 cpe:2.3:a:fedify:fedify\/fedify:*:*:*:*:*:node.js:*:*
fedify fedify\/fedify >= 2.1.0, < 2.1.1 cpe:2.3:a:fedify:fedify\/fedify:*:*:*:*:*:node.js:*:*
fedify fedify\/vocab-runtime < 2.0.8 cpe:2.3:a:fedify:fedify\/vocab-runtime:*:*:*:*:*:node.js:*:*
fedify fedify\/vocab-runtime >= 2.1.0, < 2.1.1 cpe:2.3:a:fedify:fedify\/vocab-runtime:*:*:*:*:*:node.js:*:*

References for CVE-2026-34148

cvelogic Threat Intelligence