Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M
CVE-2026-54071BabelDOC: Arbitrary Code Execution via CMap Pickle Deserialization in babeldoc/pdfminer/cmapdb.py
High 7.8
In plain English
A high-severity unsafe deserialization in BabelDOC from funstory-ai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
BabelDOC is a document translation tool. Prior to 0.6.3, BabelDOC's vendored PDF parser in babeldoc/pdfminer/cmapdb.py deserializes untrusted pickle data when CMapDB._load_data() loads CMap files. PDF-controlled Encoding or CMapName values and embedded PostScript usecmap operators can reach this sink after path separators are decoded, while _normalize_cmap_name() removes only a leading slash. Absolute paths or traversal sequences can escape the trusted CMap directories through os.path.join(), select an attacker-writable .pickle.gz file, and cause pickle.loads() to execute arbitrary Python code with the privileges of the BabelDOC process. This issue is fixed in version 0.6.3.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | babeldoc | 0.6.3 | GHSA-m8gf-v64p-gfmg |
| PyPI | babeldoc | 0.6.3 | PYSEC-2026-2389 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| funstory-ai | BabelDOC | < 0.6.3 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- https://github.com/funstory-ai/BabelDOC/security/advisories/GHSA-m8gf-v64p-gfmg x_refsource_CONFIRM
- https://github.com/funstory-ai/BabelDOC/commit/28f784ca6b437dbba040bfd9c67110373cd0924b x_refsource_MISC
- https://github.com/funstory-ai/BabelDOC/blob/main/docs/release-notes/v0.6.3.md x_refsource_MISC
- https://github.com/funstory-ai/BabelDOC/releases/tag/v0.6.3 x_refsource_MISC