Vulnerability · CVE-2026-113794
pypdf: Possible infinite loop when hitting EOF in standard xref table
Published Oct 21, 2026 · catalog updated Oct 28, 2026 · pypdf: Possible infinite loop
Last checked Oct 29, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-113794. EPSS is 0.47%. Act only if a listed version of pypdf: Possible infinite loop 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 infinite loop).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-113795 · Medium
- CVE-2026-113793 · Medium
- CVE-2026-113792 · Medium
- CVE-2026-113791 · Medium
- CVE-2026-113790 · Medium
- Severity
- Medium6.0
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.47%
- Remediation
- Version ranges on file
- Affected products
- PyPI pypdf · pip pypdf · vendor py-pdf pypdf
### Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires an incomplete file which ends inside the xref table. ### Patches This has been fixed in [pypdf==6.20.0](https://github.com/py-pdf/pypdf/releases/tag/6.20.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4170](https://github.com/py-pdf/pypdf/pull/4170). ### Notes This has been reported through both the secure channel and as a public issue at [#4169](https://github.com/py-pdf/pypdf/issues/4169).
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 → 6.20.0
- pip pypdf< 6.20.0
- vendor py-pdf pypdfversion unspecified
How to fix CVE-2026-113794
Upgrade
CVE-2026-113794 lists a fix boundary at 6.20.0. Compare the installed build with that boundary before you change production.
Version check
Affected < 6.20.0
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-2026-113794. EPSS is 0.47%. Act only if a listed version of pypdf: Possible infinite loop is installed.
Which versions are affected?
Compare what you have installed with 0 → 6.20.0, < 6.20.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-835: Infinite Loop. EPSS 0.47%. 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.
Oct 21, 2026 · GitHub Advisory Database
Detected
### Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires an incomplete file which ends inside the xref table. ### Patches This has been fixed in [pypdf==6.20.0](https://github.com/py-pdf/pypdf/releases/tag/6.20.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4170](https://github.com/py-pdf/pypdf/pull/41
Oct 21, 2026 · GitHub Advisory Database
Fix available
pypdf fixed in 6.20.0
Oct 21, 2026 · GitHub Advisory Database
Fix available
pypdf fixed in 6.20.0
Oct 21, 2026 · GitHub Advisory Database
Updated
### Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires an incomplete file which ends inside the xref table. ### Patches This has been fixed in [pypdf==6.20.0](https://github.com/py-pdf/pypdf/releases/tag/6.20.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4170](https://github.com/py-pdf/pypdf/pull/41
Oct 28, 2026 · NIST NVD
Updated
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.20.0.
Sources
- CVE.orgVulnerability recordCVE-2026-113794
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.
cve.org - FIRST EPSSExploitation probabilityCVE-2026-113794
30-day exploitation probability 0.47%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-39mj-jf6j-2qj3
pypdf: Possible infinite loop when hitting EOF in standard xref table
github.com - NIST NVDVulnerability recordCVE-2026-113794
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.
nvd.nist.gov - OpenSSF OSV / OSV ScannerPackage advisoryGHSA-39mj-jf6j-2qj3
pypdf: Possible infinite loop when hitting EOF in standard xref table
osv.dev - PyPA Advisory DatabasePackage advisoryGHSA-39mj-jf6j-2qj3
pypdf: Possible infinite loop when hitting EOF in standard xref table
osv.dev - Tenable CVE DatabaseVulnerability recordCVE-2026-113794
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf to mishandle the unexpected end of file and enter an infinite loop. This issue is fixed in version 6.20.0.
tenable.com
References
Freshness
Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- Tenable CVE DatabaseOct 28, 2026
- NIST NVDOct 28, 2026
- FIRST EPSSOct 23, 2026
- GitHub Advisory DatabaseOct 22, 2026
- CVE.orgOct 21, 2026
- PyPA Advisory DatabaseOct 21, 2026
- OpenSSF OSV / OSV ScannerOct 21, 2026