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CVE.org (no NVD analysis yet)· CNA GitHub_M

CVE-2026-119203: pypdf: Possible infinite loop when hitting EOF in standard xref table during trailer search

HighCVSS 7.1 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.22% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: py-pdf pypdf 6.21.4.

Low priority for now. Upgrade to py-pdf pypdf 6.21.4 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. Prior to 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position instead of terminating when parsing makes no progress, blocking the processing thread. This issue is fixed in version 6.21.4.

Published
Oct 29, 2026
Updated
Nov 2, 2026
EPSS
0.2% · 12th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
7.1
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/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.

Follow CVE-2026-119203

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
py-pdfpypdf

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

    • < 6.21.4affected

Affected versions

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

  • py-pdf pypdfbefore 6.21.4

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 6.21.4-16.21.4-1
openSUSE:Leap 16.0python-pypdfbefore 6.19.0-bp160.3.16.19.0-bp160.3.1
PyPIpypdfbefore 6.21.46.21.4

Same product

py-pdf: 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-2026-115580Oct 23, 2026 · pypdf: Possible long runtimes for large xref table header limits
    28Monitor
  • ← EarlierCVE-2026-115585Oct 23, 2026 · pypdf: Possible long runtimes for repeated malformed cross-reference entries (Follow-up)
    28Monitor
  • Later →CVE-2026-119204Oct 29, 2026 · pypdf: Possible large memory usage when parsing page tree
    28Monitor

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
py-pdf pypdf6.21.4 · descriptionVendor (CNA)
debian:pypdf6.21.4-1 · Debian:14Package registry (OSV)
opensuse:python-pypdf6.19.0-bp160.3.1 · openSUSE:Leap 16.0Package registry (OSV)
PyPI:pypdf6.21.4Package 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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 13, 2026+14 d
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.

Variant candidates

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

  • CVE-2026-59935113 days apartpypdf: Possible infinite loop for not terminated inline images (ASCII85 and ASCIIHex filter)
    34Monitor
  • CVE-2026-1192050 days apartpypdf: Possible infinite loop when cloning dictionaries
    28Monitor
  • CVE-2026-8430958 days apartpypdf: Possible infinite loop for TreeObject.insert_child
    27Monitor
  • CVE-2026-54530129 days apartpypdf: Possible infinite loop when retrieving fonts for layout-mode text extraction
    27Monitor
  • CVE-2026-54531129 days apartpypdf: Possible infinite loop when processing outlines/bookmarks in writer
    27Monitor
  • CVE-2026-54651129 days apartpypdf: Possible infinite loop when processing threads/articles in writer
    27Monitor

Not on record for this CVE: researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/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. SSVC exploitation— → none
  2. Exploit maturity— → none
  3. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

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

All records