# CVE-2026-124553: BabelDOC from 0.3.61 before 0.7.0 Denial of Service via ToUnicode CMap Parsing

Status: published. Published: 2026-11-08. Updated: 2026-11-08.

BabelDOC from 0.3.61 before 0.7.0 contains a resource exhaustion vulnerability that allows remote attackers to exhaust CPU and memory by supplying unbounded bfrange and cidrange spans. Attackers can submit a crafted PDF whose embedded ToUnicode CMap declares a huge range, driving billions of loop iterations and stalling the translation worker.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/funstory-ai/BabelDOC/commit/39a6e9eafeecd39404b94b2f71e88ea058753dd5

## Affected products and versions

- funstory-ai / BabelDOC (babeldoc): ≥ 0.3.61; < 0.7.0 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-770

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/funstory-ai/BabelDOC/security/advisories/GHSA-wrv8-h9rp-6fqq (CNA: VulnCheck; vendor-advisory)

- https://github.com/funstory-ai/BabelDOC/commit/39a6e9eafeecd39404b94b2f71e88ea058753dd5 (CNA: VulnCheck; patch)

- https://github.com/funstory-ai/BabelDOC/blob/main/docs/release-notes/v0.7.0.md (CNA: VulnCheck; release-notes)

- https://github.com/funstory-ai/BabelDOC/blob/v0.6.4/babeldoc/pdfminer/cmapdb.py#L378-L389 (CNA: VulnCheck; technical-description)

- https://github.com/funstory-ai/BabelDOC/blob/v0.6.4/babeldoc/format/pdf/new_parser/runtime/to_unicode_parser_runtime.py#L150-L158 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/babeldoc-from-0.3.61-before-0.7.0-denial-of-service-via-tounicode-cmap-parsing (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-124553; retrieved 2026-11-08; source updated 2026-11-08

Revision: 3bf31bcf310685f3835e29322d8198ac5b7d9c5d044def051f5da727b18109db

Canonical: https://y2.dev/cve/CVE-2026-124553

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