CVE-2026-112406: Pillow: Infinite loop in PdfParser.rewrite_pages on page tree Parent cycle
Vulnerability summary
CVE-2026-112406 is a high (CVSS 8.7) Loop with Unreachable Exit Condition vulnerability in python-pillow pillow. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 47.3% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (GitHub, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 19-10-2026PublishedVulnerability first disclosed.
- 20-10-2026Last modifiedVulnerability information updated.
Description
Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow can enter an infinite loop while rewriting PDF pages. PdfParser.rewrite_pages() follows Parent relationships without detecting a cycle in the page tree. An attacker can supply a cyclic PDF to an application that appends an image to that PDF. This can hold the worker at full CPU and deny service. This issue is fixed in version 13.0.0.
CVSS metrics
9 scores · 7 sources · 2 versions- NVDNIST8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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
- OSV · PypiEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · WolfiEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · UbuntuEcosystem advisory · calculated8.7HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.57%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundPillow
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard24 products
- apache-beam-python-3.12-sdkAll versions (No fix recorded) | < 2.77.0-r5
- mlflowAll versions (No fix recorded) | < 3.17.2-r2
- mlflow-fipsAll versions (No fix recorded) | < 3.17.2-r3
- nemo-gymAll versions (No fix recorded) | < 0.5.0_rc0_git20260729-r6
- nemo-rl-cuda-13.0All versions (No fix recorded) | < 0.7.0-r11
Wolfi6 products
- mlflowAll versions (No fix recorded)
- open-webuiAll versions (No fix recorded) | < 0.12.3-r6
- py3.10-pillowAll versions (No fix recorded)
- py3.11-pillowAll versions (No fix recorded) | < 13.0.0-r0
- py3.12-pillowAll versions (No fix recorded) | < 13.0.0-r0
Ubuntu2 products
- pillowAll versions (No fix recorded)
- pillow-python2All versions (No fix recorded)
Debian1 product
- pillowAll versions (No fix recorded)
PyPI1 product
- pillow≥ 5.1.0, < 13.0.0
Python1 product
- pillow≥ 5.1.0, < 13.0.0
Python-pillow1 product
- pillow≥ 5.1.0, < 13.0.0
7 vendors · 36 products
References
9 links- github.com/python-pillow/Pillow/security/advisories/GHSA-f2g6-542v-9j58X Refsource CONFIRMWEBAdvisoryREPORTExploitMitigationPatchVendor Advisory
- github.com/python-pillow/Pillow/commit/b3ebf20c694f2f12537a629c30229a1d5a53f777X Refsource MISCWEBFIXPatch
