CVE-2026-59200

Pillow is a Python imaging library. From 5.1.0 until 12.3.0, PdfParser.PdfStream.decode() in PIL/PdfParser.py calls zlib.decompress() with bufsize set to the PDF stream Length field without bounding the decompressed output size, allowing a crafted FlateDecode PDF stream to exhaust memory from a small file. This issue is fixed in version 12.3.0.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09	Patch
https://github.com/python-pillow/Pillow/pull/9718	Issue Tracking Patch
https://github.com/python-pillow/Pillow/releases/tag/12.3.0	Release Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565	Exploit Vendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-14 17:17

Updated : 2026-07-21 15:52

NVD link : CVE-2026-59200

Mitre link : CVE-2026-59200

CVE.ORG link : CVE-2026-59200

JSON object : View

Products Affected

python

pillow

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-770

Allocation of Resources Without Limits or Throttling

{"id": "CVE-2026-59200", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-59200", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-14T19:43:40.467012Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "python-pillow", "product": "Pillow", "versions": [{"status": "affected", "version": ">= 5.1.0, < 12.3.0"}]}]}], "published": "2026-07-14T17:17:14.620", "references": [{"url": "https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/python-pillow/Pillow/pull/9718", "tags": ["Issue Tracking", "Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/python-pillow/Pillow/releases/tag/12.3.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "Pillow is a Python imaging library. From 5.1.0 until 12.3.0, PdfParser.PdfStream.decode() in PIL/PdfParser.py calls zlib.decompress() with bufsize set to the PDF stream Length field without bounding the decompressed output size, allowing a crafted FlateDecode PDF stream to exhaust memory from a small file. This issue is fixed in version 12.3.0."}], "lastModified": "2026-07-21T15:52:40.107", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "97FD0B4C-AAFD-4B49-9F90-C029E903DE29", "versionEndExcluding": "12.3.0", "versionStartIncluding": "5.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}