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CVE-2026-45742 high CVSS 7.5

Vulnerability in github.com/gotenberg/gotenberg/v8 (CVE-2026-45742)

Summary

Vulnerability in github.com/gotenberg/gotenberg/v8 (CVE-2026-45742). Risk of unauthorized operations or information disclosure. Exploitable via downloadFrom. Mitigation: upgrade to 8.33.0 or later.

Original description

The description as published by the source.

Summary

Gotenberg is vulnerable to a remote denial of service in multipart downloadFrom handling.

A multipart request containing multiple downloadFrom entries causes concurrent goroutines to write to shared maps without synchronization. This can terminate the process with fatal error: concurrent map writes.

In the default configuration, downloadFrom is enabled and authentication is disabled, so an exposed instance can be crashed by an unauthenticated remote attacker.

Details

The issue is in pkg/modules/api/context.go.

newContext parses multipart requests and processes the downloadFrom form field before the route handler runs. For each downloadFrom entry, it starts a goroutine via errgroup.Go():

  • pkg/modules/api/context.go:221

Each goroutine downloads a file and then writes to request context maps shared by all goroutines:

  • ctx.files[filename] = path
  • ctx.diskToOriginal[path] = filename
  • ctx.filesByField[...] = append(...)

Affected lines in current main:

  • pkg/modules/api/context.go:395
  • pkg/modules/api/context.go:396
  • pkg/modules/api/context.go:401

Go maps and slices are not safe for concurrent writes. A crafted multipart request with many downloadFrom entries can therefore trigger a runtime crash.

The vulnerable downloadFrom feature was introduced in commit f2b6bd3d. The first tagged release containing this code appears to be v8.10.0.

PoC

The following self-contained command creates a temporary test f…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-45742 has been found in github.com/gotenberg/gotenberg/v8.
Attackers can target a specific entry point like downloadFrom over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade github.com/gotenberg/gotenberg/v8 to 8.33.0 or later.
If unsure, ask your IT team or search "github.com/gotenberg/gotenberg/v8 CVE-2026-45742" on the vendor's site.

CVE-2026-45742 (github.com/gotenberg/gotenberg/v8) — CWE-362 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: downloadFrom / newContext / main / f2b6bd3d
Patched: 8.33.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-362) exists in github.com/gotenberg/gotenberg/v8. Attackers reach the vulnerable code path via downloadFrom without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/gotenberg/gotenberg/v8. Attack surface: downloadFrom / newContext / main / f2b6bd3d.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 8.33.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/gotenberg/gotenberg/v8' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'github.com/gotenberg/gotenberg/v8' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で github.com/gotenberg/gotenberg/v8 を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade github.com/gotenberg/gotenberg/v8 to 8.33.0

    ステージング環境で 8.33.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

go github.com/gotenberg/gotenberg/v8
[{"type":"SEMVER","events":[{"introduced":"8.10.0"},{"fixed":"8.33.0"}]}]
Go github.com/gotenberg/gotenberg/v7
[{"type":"SEMVER","events":[{"introduced":"0"}]}]

References

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