CVE-2025-68475 | Fedify has ReDoS Vulnerability in HTML Parsing Regex

Exp

Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.6.13, 1.7.14, 1.8.15, and 1.9.2, a Regular Expression Denial of Service (ReDoS) vulnerability exists in Fedify's document loader. The HTML parsing regex at packages/fedify/src/runtime/docloader.ts:259 contains nested quantifiers that cause catastrophic backtracking when processing maliciously crafted HTML responses. This issue has been patched in versions 1.6.13, 1.7.14, 1.8.15, and 1.9.2.

Published: 2025-12-22 Last update: 2026-03-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-68475 is rated High Exploit Risk (67.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.44%). 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-2025-68475

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

Exploit prediction scoring system (EPSS) score for CVE-2025-68475

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 2026-06-01 0.32% 0.44% +0.12%
2 2026-05-20 0.43% 0.32% -0.10%
3 2026-04-23 — 0.43% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-68475

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-2025-68475

GitHub Security Advisory for CVE-2025-68475

GHSA-rchf-xwx2-hm93 · Severity: high · Ecosystem: npm — Fedify has ReDoS Vulnerability in HTML Parsing Regex

Affected software / configurations for CVE-2025-68475

Vendor Product Version Raw CPE
fedify fedify < 1.6.13 cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:*
fedify fedify >= 1.7.0, < 1.7.14 cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:*
fedify fedify >= 1.8.1, < 1.8.15 cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:*
fedify fedify >= 1.9.0, < 1.9.2 cpe:2.3:a:fedify:fedify:*:*:*:*:*:*:*:*

References for CVE-2025-68475

cvelogic Threat Intelligence