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Public proof of conceptFix available

CVE-2026-27628

A public proof of concept exists; no exploitation attested.

  • Published2026-02-25
  • Fixed in6.7.2
  • WeaknessCWE-835

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-02-2503:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-27628?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-27628?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Pypdf project pypdf
BranchAffectedFixed in
6.7< 6.7.26.7.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-27628 Red Hat Product Security23 products fixed · 5 known affected

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

    openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9 as a component of OpenShift Lightspeed · openshift-lightspeed/lightspeed-ocp-rag-rhel9 as a component of OpenShift Lightspeed · openshift-lightspeed/lightspeed-service-api-rhel9 as a component of OpenShift Lightspeed · +2 more

  • RHSA-2026:10184 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: RHOAI 2.25.5 - Red Hat OpenShift AI

  • RHSA-2026:6568 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.15.4

  • RHSA-2026:6567 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.16.3

  • RHSA-2026:6497 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.16.3

  • RHSA-2026:5665 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.10.19

2 more advisories

Full record on NVD

Fix

  1. Update Pypdf project pypdf to 6.7.2
  2. Vendor fix Red Hat Product Security RHSA-2026:10184 · 2 productsFor Red Hat OpenShift AI 2.25.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  3. Vendor fix Red Hat Product Security RHSA-2026:6568 · 3 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  4. Workaround from the vendor Red Hat Product Security RHSA-2026:10184 · 208 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
  5. No fix available, says the vendor Red Hat Product Security CVE-2026-27628 · 3 productsAffected
  6. No fix planned, says the vendor Red Hat Product Security CVE-2026-27628 · 2 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionpoc2026-02-25
  • OpenCVESSVC decisionpoc—
  • CNACVSS 4.01.2read 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-835read 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-10-22
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
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: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
Published
2026-02-25
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-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 loop. This requires reading the file. This has been fixed in pypdf 6.7.2. As a workaround, one may apply the patch manually.

Is CVE-2026-27628 actively exploited?

A proof-of-concept exploit exists for CVE-2026-27628, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-27628?

CVE-2026-27628 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Running pypdf? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

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