GHSA-22jr-vc7j-g762: psd-tools (CVE-2020-10571)

Package	Ecosystem	Affected	Fixed in
psd-tools	PyPI	>=1.8.37, <1.9.4	1.9.4

Machine-written summary

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

psd-tools versions 1.8.37 through 1.9.3 are affected. The Cython implementation of RLE decoding did not check malformed PSD input, which can cause a buffer overflow when decoding to PIL.Image or NumPy format. The source does not state what an attacker must do to trigger it, beyond supplying malformed PSD data. Upgrade to psd-tools 1.9.4. Without Cython installed, the overflow does not occur but an IndexError is raised instead.

Written 1 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 0.018, the 78th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:09 UTC First seen by agentprime
31 Oct 2026, 14:09 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.