CVE-2026-27628
published 2026-02-25CVE-2026-27628: 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…
PriorityP342high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.62%
49.0th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | pypdf | < pypdf 6.9.0-1 (forky) | pypdf 6.9.0-1 (forky) |
| debian | pypdf2 | < pypdf 6.9.0-1 (forky) | pypdf 6.9.0-1 (forky) |
| py-pdf | pypdf | < 6.7.2 | 6.7.2 |
| pypdf_project | pypdf | < 6.7.2 | 6.7.2 |
| pypdf_project | pypdf | >= 0 < 6.9.0-1 | 6.9.0-1 |
| pypdf_project | pypdf | >= 0 < 6.7.2 | 6.7.2 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.01.2LOWCVSS: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
osv1.2LOW
vendor_debian1.2LOW
vendor_redhat1.2LOW
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Red Hat
pypdf: possible infinite loop when loading circular /Prev entries in cross-reference streams
vendor_redhat·2026-02-25·CVSS 1.2
CVE-2026-27628 [LOW] CWE-835 pypdf: possible infinite loop when loading circular /Prev entries in cross-reference streams
pypdf: possible infinite loop when loading circular /Prev entries in cross-reference streams
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.
A flaw was found in pypdf. Processing a specially crafted PDF document, specifically with circular /Prev references in the cross-reference (xref) chain, can cause an infinite loop and a high consumption of CPU, resulting in a denial of service.
Statement: To exploit this flaw, an attacker must be able to supply a crafted PDF file to be processed by an application using the pypdf library. This issue can cause the applica
Debian
CVE-2026-27628: pypdf - pypdf is a free and open-source pure-python PDF library. Prior to 6.7.2, an atta...
vendor_debian·2026·CVSS 1.2
CVE-2026-27628 [LOW] CVE-2026-27628: pypdf - pypdf is a free and open-source pure-python PDF library. Prior to 6.7.2, an atta...
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.
Scope: local
bookworm: open
forky: resolved (fixed in 6.9.0-1)
sid: resolved (fixed in 6.9.0-1)
trixie: open
OSV
CVE-2026-27628: pypdf is a free and open-source pure-python PDF library
osv·2026-02-25·CVSS 1.2
CVE-2026-27628 [LOW] CVE-2026-27628: pypdf is a free and open-source pure-python PDF library
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.
OSV
pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
osv·2026-02-25
CVE-2026-27628 [LOW] pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file.
### Patches
This has been fixed in [pypdf==6.7.2](https://github.com/py-pdf/pypdf/releases/tag/6.7.2).
### Workarounds
If users cannot upgrade yet, consider applying the changes from PR [#3655](https://github.com/py-pdf/pypdf/pull/3655).
GHSA
pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
ghsa·2026-02-25
CVE-2026-27628 [LOW] CWE-835 pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
### Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file.
### Patches
This has been fixed in [pypdf==6.7.2](https://github.com/py-pdf/pypdf/releases/tag/6.7.2).
### Workarounds
If users cannot upgrade yet, consider applying the changes from PR [#3655](https://github.com/py-pdf/pypdf/pull/3655).
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-27628 pypdf: possible infinite loop when loading circular /Prev entries in cross-reference streams
bugzilla·2026-02-25·CVSS 7.5
CVE-2026-27628 [HIGH] CVE-2026-27628 pypdf: possible infinite loop when loading circular /Prev entries in cross-reference streams
CVE-2026-27628 pypdf: possible infinite loop when loading circular /Prev entries in cross-reference streams
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.
Bugzilla
CVE-2026-27628 python-PyPDF2: possible infinite loop when loading circular /Prev entries in cross-reference streams [fedora-all]
bugzilla·2026-02-25·CVSS 7.5
CVE-2026-27628 [HIGH] CVE-2026-27628 python-PyPDF2: possible infinite loop when loading circular /Prev entries in cross-reference streams [fedora-all]
CVE-2026-27628 python-PyPDF2: possible infinite loop when loading circular /Prev entries in cross-reference streams [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.
Wiz
CVE-2026-27628 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 1.2
CVE-2026-27628 [LOW] CVE-2026-27628 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-27628 :
Python vulnerability analysis and mitigation
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.
Source : NVD
## 1.2
Score
Published February 25, 2026
Severity LOW
CNA Score 1.2
Affected Technologies
Python
Wolfi
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 16.6
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
open-webui
pypdf
Sources
NVD
Chainguard Has Fix Added at: Mar 02, 2026
Debian 11 Severity HIGH No Fix
2026-02-25
Published