CVE-2020-35655 [Medium] | Out-of-bounds Read in Pillow

CVE-2020-35655 is rated Moderate Risk (47/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.57%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-26	1.46%	1.57%	+0.11%
2	2026-06-15	0.17%	1.46%	+1.29%
3	2026-06-07	—	0.17%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-26

1.46%

1.57%

+0.11%

2026-06-15

0.17%

1.46%

+1.29%

2026-06-07

—

0.17%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.4	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	2.8	2.5	[email protected]
5.8	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:P/I:N/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	8.6	4.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.4

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

2.8

2.5

[email protected]

5.8

2.0

MEDIUM

AV:N/AC:M/Au:N/C:P/I:N/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

8.6

4.9

[email protected]

OS Trackers for CVE-2020-35655

vendor	priority	summary	link
`alpine`	medium	CVE-2020-35655: 1 source package rows (py3-pillow); 9 state rows across 9 repos (3.12-main, 3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community, edge-main); fixed 9, open 0.	https://security.alpinelinux.org/vuln/CVE-2020-35655
`debian`	not yet assigned	CVE-2020-35655 not yet assigned priority: Debian including 1 source packages (pillow), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2020-35655
`gentoo`	normal	CVE-2020-35655: 1 GLSA(s) (202101-08), 1 atom(s) (dev-python/pillow); latest impact normal.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-35655
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2020-35655
`suse`	high	CVE-2020-35655 severity important: SUSE including 22 source package names (python-Pillow, python-Pillow-5.2.0-3.8.1, …), 26 product×package rows across 11 product lines (HPE Helion OpenStack 8, SUSE Liberty Linux 8, … (11 product lines)): Fixed 22, Known Not Affected 4.	https://www.suse.com/security/cve/CVE-2020-35655/
`ubuntu`	medium	CVE-2020-35655 medium priority: Ubuntu including 3 source packages (pillow, pillow-python2, python-imaging), 48 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 28, not-affected 12, released 4, needs-triage 3, ignored 1.	https://ubuntu.com/security/CVE-2020-35655

Affected software / configurations for CVE-2020-35655

Vendor	Product	Version	Raw CPE
python	pillow	>= 4.3.0, < 8.1.0	cpe:2.3:a:python:pillow::::::::
fedoraproject	fedora	32	cpe:2.3:o:fedoraproject:fedora:32:::::::*
fedoraproject	fedora	33	cpe:2.3:o:fedoraproject:fedora:33:::::::*

References for CVE-2020-35655

URL	Tags
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6BYVI5G44MRIPERKYDQEL3S3YQCZTVHE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BF553AMNNNBW7SH4IM4MNE4M6GNZQ7YD/
https://pillow.readthedocs.io/en/stable/releasenotes/index.html	Release Notes Third Party Advisory

URL

CVE-2020-35655

Exploit prediction scoring system (EPSS) score for CVE-2020-35655

Common vulnerability scoring system (CVSS) metrics for CVE-2020-35655

Weakness enumeration for CVE-2020-35655

GitHub Security Advisory for CVE-2020-35655

OS Trackers for CVE-2020-35655

Affected software / configurations for CVE-2020-35655

References for CVE-2020-35655