HOMEVULNERABILITIESCVE-2026-42309
MEDIUM

CVE-2026-42309

CWE-122Published: May 9, 2026· Updated: May 12, 2026

5.5
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.9th

Official Description

Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This issue has been patched in version 12.2.0.

NVD Source

Technical Analysis

CVE-2026-42309 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Python1 product
pillow
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://github.com/python-pillow/Pillow/security/advisories/GHSA-5xmw-vc9v-4wf2

All References (2)

→
https://github.com/python-pillow/Pillow/releases/tag/12.2.0Product · Release Notes
→
https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xmw-vc9v-4wf2Vendor Advisory

Quick Facts

CVE IDCVE-2026-42309
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-122
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMay 9, 2026

Related CVEs (CWE-122)

CVE-2026-46752
10.0
CVE-2026-44050
9.9
CVE-2026-32945
9.8
CVE-2026-28780
9.8
CVE-2006-10003
9.8
CVE-2026-41096
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-42309 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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