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Vulnerabilities

Vulnerability · CVE-2026-113789

pypdf: Possible long runtimes/large memory usage when retrieving form fields

Published Oct 21, 2026 · catalog updated Oct 22, 2026 · pypdf: Possible long runtimes/large

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-113789. EPSS is 0.32%. Act only if a listed version of pypdf: Possible long runtimes/large 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: Possible long runtimes/large).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.32%
Remediation
Version ranges on file
Affected products
PyPI pypdf · pip pypdf · pypi pypdf · vendor py-pdf pypdf

### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage and/or long runtimes. This requires retrieving the form fields of a document. ### Patches This has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4219](https://github.com/py-pdf/pypdf/pull/4219).

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.

  • PyPI pypdf0 → 6.21.0
  • pip pypdf< 6.21.0
  • pypi pypdfversion unspecified
  • vendor py-pdf pypdfversion unspecified

How to fix CVE-2026-113789

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-2026-113789. EPSS is 0.32%. Act only if a listed version of pypdf: Possible long runtimes/large is installed.

Which versions are affected?

Compare what you have installed with 0 → 6.21.0, < 6.21.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-400: Uncontrolled Resource Consumption; CWE-407. EPSS 0.32%. 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. Oct 22, 2026 · GitHub Advisory Database

    Detected

    ### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage and/or long runtimes. This requires retrieving the form fields of a document. ### Patches This has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4219](https://github.com/py-pdf/p

  2. Oct 22, 2026 · GitHub Advisory Database

    Updated

    ### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage and/or long runtimes. This requires retrieving the form fields of a document. ### Patches This has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4219](https://github.com/py-pdf/p

  3. Oct 22, 2026 · PyPA Advisory Database

    Fix available

    pypdf fixed in 6.21.0

  4. Oct 22, 2026 · PyPA Advisory Database

    Fix available

    pypdf fixed in 6.21.0

  5. Oct 22, 2026 · PyPA Advisory Database

    Updated

    ### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage and/or long runtimes. This requires retrieving the form fields of a document. ### Patches This has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4219](https://github.com/py-pdf/p

Sources

  • CVE.orgVulnerability recordCVE-2026-113789

    pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF that causes large memory usage or long runtimes when an application retrieves the document's form fields. This issue is fixed in version 6.21.0.

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-113789

    30-day exploitation probability 0.32%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-6vvc-x485-93v7

    pypdf: Possible long runtimes/large memory usage when retrieving form fields

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-113789

    An attacker who uses this vulnerability can craft a PDF which leads to large memory usage and/or long runtimes. This requires retrieving the form fields of a document.

    advisories.gitlab.com
  • PyPA Advisory DatabasePackage advisoryGHSA-6vvc-x485-93v7

    pypdf: Possible long runtimes/large memory usage when retrieving form fields

    osv.dev

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 3, 2026
  • GitHub Advisory DatabaseOct 23, 2026
  • PyPA Advisory DatabaseOct 23, 2026
  • GitLab Advisory DatabaseOct 23, 2026
  • CVE.orgOct 23, 2026