GHSA-f5gc-p5m3-v347: petl (CVE-2020-29128)

Package	Ecosystem	Affected	Fixed in
petl	PyPI	<1.6.8	1.6.8

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

petl versions before 1.6.8 are vulnerable to XML external entity (XXE) processing in some configurations, where lxml is the XML library in use. An attacker who can submit XML input to an application that uses petl and returns the output can read arbitrary files the application's user can access. To fix this, upgrade petl to 1.6.8 or later; alternatively, make sure the application does not accept external XML input or does not use the fromxml() function.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.8	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	GitHub Advisory Database

CISA KEV Not listed.
EPSS 0.023, the 83rd percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:38 UTC First seen by agentprime
31 Oct 2026, 14:38 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.