CVE-2026-27628: py-pdf pypdf Infinite Loop
CVSS: 7.5v3.1HighModified
AliasesGHSA-2rw7-x74f-jg35PYSEC-2026-3005UBUNTU-CVE-2026-27628DEBIAN-CVE-2026-27628CGA-75jx-47gw-7q7v
Published 25-02-2026Last modified 27-02-2026
Vulnerability summary
CVE-2026-27628 is a high (CVSS 7.5) Infinite Loop vulnerability in py-pdf pypdf. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 48.7% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (NVD)EPSS score
0.62%
0%100%
Low · +0.27 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 3Timeline
- 25-02-2026PublishedVulnerability first disclosed.
- 27-02-2026Last modifiedVulnerability information updated.
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.2, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file. This has been fixed in pypdf 6.7.2. As a workaround, one may apply the patch manually.
CVSS metrics
9 scores · 7 sources · 2 versionsLow 1.2Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:USources6 sources · 1.2–5.1
- OSV · PypiEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:UDiffers
- OSV · UbuntuEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:UDiffers
- OSV · WolfiEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:UDiffers
- OSV · ChainguardEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:UDiffers
- NVDNIST1.2LowCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/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
High 7.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.62%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
+0.27 pp
From 0.35% on 20-09-2026
20-09-202620-10-2026
EPSS score0.62%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- pypdfAll versions (No fix recorded) | < 6.9.0-1
- pypdf2All versions (No fix recorded)
Ubuntu2 products
- pypdfAll versions (No fix recorded)
- pypdf2All versions (No fix recorded)
Chainguard1 product
- open-webui< 0.8.5-r0
Py-pdf1 product
- pypdf< 6.7.2
Pypdf_project1 product
- pypdf< 6.7.2
PyPI1 product
- pypdf< 6.7.2
Wolfi1 product
- open-webui< 0.8.5-r0
7 vendors · 9 products
References
12 links- github.com/py-pdf/pypdf/security/advisories/GHSA-2rw7-x74f-jg35X Refsource CONFIRMWEBREPORTAdvisoryPatchVendor Advisory
- github.com/py-pdf/pypdfPACKAGE
- pypi.org/project/pypdfPACKAGE
