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Vulnerabilities

Vulnerability · CVE-2023-36464

pypdf is an open source, pure-python PDF library.

Published Jun 27, 2023 · catalog updated Nov 2, 2026 · pypdf is an open

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2023-36464. EPSS is 0.35%. Act only if a listed version of pypdf is an open is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (pypdf is an open).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.35%
Remediation
Version ranges on file
Affected products
cpe py-pdf/pypdf · cpe pypdf2 project/pypdf2

pypdf is an open source, pure-python PDF library. In affected versions an attacker may craft a PDF which leads to an infinite loop if is executed. That is, for example, the case if the user extracted text from such a PDF. This issue was introduced in pull request #969 and resolved in pull request #1828. Users are advised to upgrade. Users unable to upgrade may modify the line in to .

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe py-pdf/pypdf< 3.9.0
  • cpe pypdf2 project/pypdf2version unspecified

How to fix CVE-2023-36464

  • Upgrade

    CVE-2023-36464 lists a fix boundary at 3.9.0. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 3.9.0

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2023-36464. EPSS is 0.35%. Act only if a listed version of pypdf is an open is installed.

Which versions are affected?

Compare what you have installed with < 3.9.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-835: Infinite Loop. EPSS 0.35%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 27, 2023 · NIST NVD

    Detected

    pypdf is an open source, pure-python PDF library. In affected versions an attacker may craft a PDF which leads to an infinite loop if is executed. That is, for example, the case if the user extracted text from such a PDF. This issue was introduced in pull request #969 and resolved in pull request #1828. Users are advised to upgrade. Users unable to upgrade may modify the line in to .

  2. Nov 2, 2026 · NIST NVD

    Updated

    pypdf is an open source, pure-python PDF library. In affected versions an attacker may craft a PDF which leads to an infinite loop if is executed. That is, for example, the case if the user extracted text from such a PDF. This issue was introduced in pull request #969 and resolved in pull request #1828. Users are advised to upgrade. Users unable to upgrade may modify the line in to .

Sources

  • CVE.orgVulnerability recordCVE-2023-36464

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2023-36464

    pypdf is an open source, pure-python PDF library. In affected versions an attacker may craft a PDF which leads to an infinite loop if is executed. That is, for example, the case if the user extracted text from such a PDF. This issue was introduced in pull

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • NIST NVDNov 2, 2026