CVE-2026-42310: python-pillow pillow Infinite Loop
CVSS: 5.5v3.1MediumAnalyzed
AliasesGHSA-r73j-pqj5-w3x7BIT-pillow-2026-42310PYSEC-2026-2874UBUNTU-CVE-2026-42310DEBIAN-CVE-2026-42310CGA-3qhj-h396-88mvCGA-63cc-wj58-3x32CGA-c3mh-3752-vxmpCGA-h7j3-p7hg-x5cfCGA-m2m2-jh38-p46wCGA-wx2r-r32q-7j8g
Published 09-05-2026Last modified 12-05-2026
Vulnerability summary
CVE-2026-42310 is a medium (CVSS 5.5) Infinite Loop vulnerability in python-pillow pillow. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.8% of scored vulnerabilities.
CVSS score
5.5/10
010
Medium · v3.1 (NVD)EPSS score
0.18%
0%100%
Low · +0.05 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 09-05-2026PublishedVulnerability first disclosed.
- 12-05-2026Last modifiedVulnerability information updated.
Description
Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This issue has been patched in version 12.2.0.
CVSS metrics
10 scores · 7 sources · 2 versionsMedium 5.1Preferred score · CVE.org (CNA)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:NSourcesAll 6 agree
- OSV · PypiEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- OSV · UbuntuEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- OSV · WolfiEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- NVDNIST5.1MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Medium 5.5Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · PypiEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.18%
Chance of exploitation in the next 30 days
Percentile
7%
Versus all other CVEs
30-day change
+0.05 pp
From 0.13% on 19-09-2026
19-09-202619-10-2026
EPSS score0.18%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Chainguard4 products
- kubeflow-pipelines-visualization-server< 2.16.1-r0
- mlflow< 3.16.0-r0
- open-webui< 0.11.0-r0
- superset-6.0< 6.0.0-r10
Wolfi4 products
- kubeflow-pipelines-visualization-server< 2.16.1-r0
- mlflow< 3.16.0-r0
- open-webui< 0.11.0-r0
- superset-6.0< 6.0.0-r10
Ubuntu2 products
- pillowAll versions (No fix recorded) | < 9.0.1-1ubuntu0.4 | < 10.2.0-1ubuntu1.2 | < 11.3.0-1ubuntu1.3 | < 12.1.1-2ubuntu1.2
- pillow-python2All versions (No fix recorded)
Debian1 product
- pillowAll versions (No fix recorded) | < 11.1.0-5+deb13u3 | < 12.2.0-1
PyPI1 product
- pillow≥ 4.2.0, < 12.2.0
Python1 product
- pillow≥ 4.2.0, < 12.2.0
Python-pillow1 product
- pillow≥ 4.2.0, < 12.2.0
7 vendors · 14 products
References
13 links- github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7X Refsource CONFIRMWEBREPORTAdvisoryPatchVendor Advisory
- github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468X Refsource MISCWEBFIXPatch
- pypi.org/project/pillowPACKAGE
