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CVE-2026-41313· NVD / CVE Program· CNA GitHub_M

pypdf: Possible long runtimes for wrong size values in incremental mode

Noroxi assessment

Priority: Monitor (action score 19/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.38% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: pypdf (Debian:14) 6.19.0-1; pypdf (PyPI) 6.10.2.

Low priority for now. Upgrade to pypdf (Debian:14) 6.19.0-1; pypdf (PyPI) 6.10.2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to long runtimes. This requires loading a PDF with a large trailer `/Size` value in incremental mode. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.

MediumCVSS 4.8 · v4.0—No exploit Fix available
Published
Apr 22, 2026
Updated
Jun 17, 2026
EPSS
0.3% · 31th percentile

Report tools

JSON

Action score

19

Monitor

Low priority for now.

CVSS
19 / 40 · 4.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
4.8
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
pypdf projectpypdf

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • pypdf project pypdfbefore 6.10.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • py-pdf pypdf

    • < 6.10.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12pypdffrom 0—
Debian:12pypdf2from 0—
Debian:14pypdfbefore 6.19.0-16.19.0-1
PyPIpypdfbefore 6.10.26.10.2

Same product

pypdf project: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-103000pypdf: Possible large memory usage when retrieving alphabetical page labels
    34Monitor
  • CVE-2026-102999pypdf: Possible long runtimes with large amount of embedded files
    34Monitor
  • CVE-2026-102998pypdf: Possible long runtimes when generating appearance streams
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-41168Apr 22, 2026 · pypdf has possible long runtimes for wrong size values in cross-reference and object streams
    27Monitor
  • ← EarlierCVE-2026-41312Apr 22, 2026 · pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM
    19Monitor
  • Later →CVE-2026-41314Apr 22, 2026 · pypdf: Manipulated FlateDecode image dimensions can exhaust RAM
    19Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:pypdf6.19.0-1 · Debian:14Package registry (OSV)
PyPI:pypdf6.10.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-411680 days apartpypdf has possible long runtimes for wrong size values in cross-reference and object streams
    27Monitor
  • CVE-2026-2702561 days apartpypdf has possible long runtimes/large memory usage for large /ToUnicode streams
    27Monitor
  • CVE-2025-62707182 days apartpypdf affected by possible infinite loop when reading DCT inline images without EOF marker
    26Monitor
  • CVE-2026-4815636 days apartpypdf: Possible long runtimes for zero-only width values in cross-reference streams
    20Monitor
  • CVE-2026-71852107 days apartpypdf: Possible long runtimes/large memory usage for large CID font width ranges
    19Monitor
  • CVE-2026-84311132 days apartpypdf: Possible long runtimes/large memory usage when extracting XForm objects
    19Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
P
Scope
X

Weakness class (CWE)

CWE-834 · Excessive Iteration

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records