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TI-2026-22010 Aliases CVE-2026-27628GHSA-2rw7-x74f-jg35

pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams

Priority MEDIUM 41CWE-835Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Partial Red Hat: 6 fixed, 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-835.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00397 34th percentileScored 2026-11-07
Fix Partial pypdf (py-pdf): 6.7.2pypdf (PyPI): 6.7.2Red Hat: 7 advisoriesRed Hat: 6 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
py-pdfpypdfbefore 6.7.26.7.2Patch availableCNA
—pypdf (PyPI)before 6.7.26.7.2Patch availableGHSA-2rw7-x74f-jg35
  • pypdf Vendorpy-pdf Affected before 6.7.2 Fixed in 6.7.2 Patch available CNA
  • pypdf (PyPI) Vendor— Affected before 6.7.2 Fixed in 6.7.2 Patch available GHSA-2rw7-x74f-jg35

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:*before 6.7.2Vulnerablepy-pdf
  • cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:* Versions before 6.7.2 Vulnerable ·py-pdf

Remediation

  • Fix · CNA pypdf (py-pdf) Fixed in 6.7.2
  • Fix · GHSA-2rw7-x74f-jg35 pypdf (PyPI) Fixed in 6.7.2 Advisory →

Red Hat 7 advisories

  • RHSA-2026:10184 Released 2026-04-23 · Red Hat rating Important
    RHOAI 2.25.5 - Red Hat OpenShift AI
    • Red Hat OpenShift AI 2.25 registry.redhat.io/rhoai/odh-caikit-nlp-rhel9, registry.redhat.io/rhoai/odh-caikit-tgis-serving-rhel9, registry.redhat.io/rhoai/odh-dashboard-rhel9 +47
  • RHSA-2026:6568 Released 2026-04-03 · Red Hat rating Important
    Red Hat Quay 3.15.4
    • Red Hat Quay 3.15 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:6567 Released 2026-04-03 · Red Hat rating Important
    Red Hat Quay 3.16.3
    • Red Hat Quay 3.16 registry.redhat.io/quay/quay-rhel9
Show 4 more Red Hat advisories
  • RHSA-2026:6497 Released 2026-04-02 · Red Hat rating Important
    Red Hat Quay 3.16.3
    • Red Hat Quay 3.16 registry.redhat.io/quay/quay-rhel9
  • RHSA-2026:5665 Released 2026-03-24 · Red Hat rating Important
    Red Hat Quay 3.10.19
    • Red Hat Quay 3.10 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:5168 Released 2026-03-19 · Red Hat rating Important
    Red Hat Quay 3.9.19
    • Red Hat Quay 3.9 registry.redhat.io/quay/quay-rhel8
  • RHSA-2026:4942 Released 2026-03-18 · Red Hat rating Important
    Red Hat Quay 3.12.15
    • Red Hat Quay 3.12 registry.redhat.io/quay/quay-rhel8

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
OpenShift LightspeedAffectedNo fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix planned: Will not fix
Red Hat OpenShift AI 2.25Fixed RHSA-2026:10184
Red Hat Quay 3.10Fixed RHSA-2026:5665
Red Hat Quay 3.12Fixed RHSA-2026:4942
Red Hat Quay 3.15Fixed RHSA-2026:6568
Red Hat Quay 3.16Fixed RHSA-2026:6497, RHSA-2026:6567
Red Hat Quay 3.9Fixed RHSA-2026:5168
Not affected: 6 products
  • Red Hat OpenShift AI 2.25
  • Red Hat Quay 3.10
  • Red Hat Quay 3.12
  • Red Hat Quay 3.15
  • Red Hat Quay 3.16
  • Red Hat Quay 3.9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27628
  2. 2026-10-03 Alias added: GHSA-2rw7-x74f-jg35
  3. 2026-10-23 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Patch 2

Advisory 1

Other 2

  • TI-2023-18601 Infinite Loop when reading malformed objects in pypdf CVSS 3.1MEDIUM 6.5
  • TI-2023-18305 Infinite Loop when a comment isn't followed by a character in pypdf CVSS 3.1MEDIUM 6.2
  • TI-2026-42743 pypdf: Possible infinite loop for not terminated inline images CVSS 4.0HIGH 8.7
  • TI-2026-42742 pypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter) CVSS 4.0HIGH 8.7
  • TI-2026-65557 pypdf: Possible large memory usage when retrieving alphabetical page labels CVSS 4.0HIGH 8.7
  • TI-2026-65556 pypdf: Possible long runtimes with large amount of embedded files CVSS 4.0HIGH 8.7
See all 65 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences