CVE-2026-28804: py-pdf pypdf Inefficient Algorithmic Complexity
CVSS: 6.9v4.0MediumAnalyzed
AliasesGHSA-9m86-7pmv-2852PYSEC-2026-3014UBUNTU-CVE-2026-28804DEBIAN-CVE-2026-28804openSUSE-SU-2026:10321-1openSUSE-SU-2026:20348-1CGA-344h-qj45-f975CGA-mvv2-4m9q-7753
Published 06-03-2026Last modified 06-03-2026
Vulnerability summary
CVE-2026-28804 is a medium (CVSS 6.9) Inefficient Algorithmic Complexity vulnerability in py-pdf pypdf. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 44.3% of scored vulnerabilities.
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)EPSS score
0.53%
0%100%
Low · +0.14 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 06-03-2026PublishedVulnerability first disclosed.
- 06-03-2026Last modifiedVulnerability information updated.
Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.
CVSS metrics
8 scores · 6 sources · 2 versionsMedium 6.9Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:NSourcesAll 5 agree
- OSV · PypiEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- OSV · UbuntuEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated6.9MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- NVDNIST6.9MediumCVSS:4.0/AV:N/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 5.3Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LSourcesAll 3 agree
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS trend
Probability
0.53%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
+0.14 pp
From 0.40% on 21-09-2026
21-09-202621-10-2026
EPSS score0.53%
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)
Opensuse2 products
- python-PyPDF2&distro=openSUSE Leap 16.0< 2.11.1-bp160.3.1
- python-PyPDF2&distro=openSUSE Tumbleweed< 2.11.1-6.1
Chainguard1 product
- litellm< 1.81.14-r0
Py-pdf1 product
- pypdf< 6.7.5
Pypdf_project1 product
- pypdf< 6.7.5
PyPI1 product
- pypdf< 6.7.5
Ubuntu1 product
- pypdfAll versions (No fix recorded)
7 vendors · 9 products
References
14 links- github.com/py-pdf/pypdf/security/advisories/GHSA-9m86-7pmv-2852X Refsource CONFIRMWEBREPORTAdvisoryPatchVendor Advisory
- github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98fX Refsource MISCWEBREPORTFIXPatch
- github.com/py-pdf/pypdfPACKAGE
- pypi.org/project/pypdfPACKAGE
