Description
pdfminer.six before 20251230 contains an insecure deserialization vulnerability in the CMap loading mechanism. The library uses Python pickle to deserialize CMap cache files without validation. An attacker with the ability to place a malicious pickle file in a location accessible to the application can trigger arbitrary code execution or privilege escalation when the file is loaded by a trusted process. This is caused by an incomplete patch to CVE-2025-64512.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | pdfminer | 20260107+dfsg-1 | — |
| Debian 13 | pdfminer | No fix yet | — |
| Debian 12 | pdfminer | No fix yet | — |
| Debian 11 | pdfminer | 20200726-1+deb11u2 | DLA-4374-2 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | pdfminer | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | pdfminer | 20221105+dfsg-1ubuntu0.1~esm1 | USN-8837-1 |
| Ubuntu Pro 22.04 LTS | pdfminer | 20220319+dfsg-1ubuntu0.1~esm1 | USN-8837-1 |
| Ubuntu Pro 20.04 LTS | pdfminer | 20191020+dfsg-2ubuntu0.1~esm1 | USN-8837-1 |
| Ubuntu Pro 18.04 LTS | pdfminer | 20140328+dfsg-1ubuntu0.18.04.1~esm1 | USN-8837-1 |
| Ubuntu Pro 16.04 LTS | pdfminer | 20140328+dfsg-1ubuntu0.16.04.1~esm1 | USN-8837-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
isukasanuj/CVE-2025-70559 ★ 0 · Aug 15, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | pdfminer-six | < 20251230 | 20251230 | GHSA-f83h-ghpp-7wcc |
Advisories 2
- USN-8837-1 pdfminer vulnerabilities Ubuntu Security Notices (USN) · Sep 28, 2026
- DLA-4374-2 pdfminer - regression update Debian Security (DSA / DLA) · Mar 9, 2026