PatchTheCVECVE-2019-12760: A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache
CVE-2019-12760 is a low-severity flaw (CVSS 3.3) affecting parso. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache. Cache loading relies on pickle and, provided that an evil pickle can be written to a cache grammar file and that its parsing can be triggered, this flaw leads to Arbitrary Code Execution. NOTE: This is disputed because "the cache directory is not under control of the attacker in any common configuration.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 3.3 (Low) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | High |
| User interaction | None |
| EPSS exploit chance | 1.5% (top 25%) |
| CISA exploited list | No |
| Weakness | CWE-502 |
| Published | 2019-06-06 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2019-12760?
parso: upgrade to newer than 0.4.0. Exact commands for each OS are on this page.
Is CVE-2019-12760 being exploited?
CVE-2019-12760 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2019-12760 affect?
CVE-2019-12760 affects parso. Severity is low (CVSS 3.3). A deserialization vulnerability exists in the way parso through 0.4.0 handles grammar parsing from the cache. Cache loading relies on pickle and, provided that an evil pickle can be written to a cache grammar file and that its parsing can b
How urgent is CVE-2019-12760?
Priority 35/100. Public exploit reference