What’s Vulnerable › Vulnerabilities

CVE-2026-45742: Gotenberg: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-10-27
• Weakness: CWE-362

Description

Gotenberg is a Docker-powered stateless API for PDF files. From 8.10.0 until 8.33.0, the newContext function in pkg/modules/api/context.go starts one errgroup.Go goroutine for each multipart downloadFrom entry and allows those goroutines to concurrently write to the shared ctx.files, ctx.diskToOriginal, and ctx.filesByField maps and slices. Go maps and slices are not safe for concurrent mutation, so a crafted multipart request containing many downloadFrom entries can trigger a data race and terminate the process with a fatal concurrent map writes runtime error. The default configuration enables downloadFrom and disables authentication, allowing an unauthenticated remote attacker to crash an exposed conversion service and cause a denial of service. This issue is fixed in version 8.33.0.

Affected products

• gotenberg: from 8.10.0, < 8.33.0

References

• https://github.com/gotenberg/gotenberg/commit/6671b5e5d30289087ca80130fc76f130cfa4dd7b
• https://github.com/gotenberg/gotenberg/releases/tag/v8.33.0
• https://github.com/gotenberg/gotenberg/security/advisories/GHSA-vp73-vjw8-8f32
• https://github.com/gotenberg/gotenberg/security/advisories/GHSA-vp73-vjw8-8f32

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