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CVE-2026-119209high7.1

pypdf: Possible large memory usage when parsing cross-reference streams

Impact

The pypdf library, versions less than 6.21.3, may experience large memory usage when parsing cross-reference streams in a crafted PDF file. An attacker must provide a file with cross-reference streams to exploit this vulnerability. The impact is large memory usage.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.
Applies when

This requires opening a file with cross-reference streams.

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

pypdf PyPI
Affected range Recorded fix
Earlier releases before 6.21.3Ecosystem versions6.21.3

Version evidence: OSV · GHSA-x3rh-gjgm-fmqc

View original version evidence (125 explicit versions)

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

py-pdf · GitHub_M

pypdf

1 range
GitHub_M version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

< 6.21.3

unaffected

unknown

Other versions: unknown

Original source description

Impact

An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires opening a file with cross-reference streams.

Patches

This has been fixed in pypdf==6.21.3.

Workarounds

If you cannot upgrade yet, consider applying the changes from PR #4269.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-119209

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-400 ↗

CWE-400: Uncontrolled Resource Consumption

GitHub_M

Related →
CWE-770 ↗

CWE-770: Allocation of Resources Without Limits or Throttling

GitHub_M

Related →
Contributing organizations · 2
GitHub_M

Assigning organization

2026-10-29
CISA-ADP

Additional data publisher

2026-10-30

What changed

Follow changes
  1. CVE · CVE-2026-119209

    Observed 2026-10-30T17:19:32.171Z · upstream updated 2026-10-30T16:00:30.516Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-30T15:47:28.155084Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "yes"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

6 sources
github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc
Security advisoryGitHub_M
github.com/py-pdf/pypdf/pull/4269
PatchGitHub_M
github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4
PatchGitHub_M
github.com/py-pdf/pypdf/releases/tag/6.21.3
Release notesGitHub_M
nvd.nist.gov/vuln/detail/CVE-2026-119209
Security advisory
github.com/py-pdf/pypdf
Source reference