MegaParse 0.0.55 Server-Side Request Forgery via POST /v1/url

published 2026-09-04 2 mo ago modified 2026-09-23 46 d ago also EUVD-2026-71140

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

MegaParse 0.0.55 contains an unauthenticated server-side request forgery vulnerability in the POST /v1/url endpoint that fetches caller-supplied URLs server-side. Attackers can supply internal service URLs or metadata endpoints without authentication to read their responses directly from the JSON response.

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 1 mo ago (2026-09-10)

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

The-Vibe-Company megaparse

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

github.com /The-Vibe-Company/megaparse/issues/259
issue-tracking
github.com /The-Vibe-Company/megaparse
product
github.com /The-Vibe-Company/megaparse/blob/megaparse-v0.0.55/libs/megaparse/src/megaparse/api/app.py
technical-description
vulncheck.com /advisories/megaparse-0.0.55-server-side-request-forgery-via-post-v1-url
third-party-advisory

Sources

CVE List CVE-2026-85691
NVD CVE-2026-85691

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary