CVE-2026-113795

pypdf: Possible large memory usage for streams with multiple filters

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, accessing a crafted PDF stream with a large number of filters or multiple filters that pass around large amounts of data can cause large memory consumption. This issue is fixed in version 6.20.0.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-113789

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

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.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-119207

pypdf: Possible large memory usage for exceptions in strict mode

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory when strict mode loads a crafted invalid PDF dictionary. Nested parsing failures add repeated exception text to newly raised errors, allowing a small malformed dictionary to amplify into very large error messages. This issue is fixed in version 6.21.3.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-40260

pypdf: Manipulated XMP metadata entity declarations can exhaust RAM

pypdf is a free and open-source pure-python PDF library. In versions prior to 6.10.0, manipulated XMP metadata entity declarations can exhaust RAM. An attacker who exploits this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the XMP metadata. This issue has been fixed in version 6.10.0.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-28804

pypdf: Inefficient decoding of ASCIIHexDecode streams

pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-119209

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

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory while opening a crafted PDF containing cross-reference streams that declare very large entry counts. Highly compressible streams and /Prev chains can multiply the number of parsed entries across a document, while negative /Index counts can bypass the existing per-stream clamp. This issue is fixed in version 6.21.3.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2025-55197

pypdf's Manipulated FlateDecode streams can exhaust RAM

pypdf is a free and open-source pure-python PDF library. Prior to version 6.0.0, an attacker can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are affected on explicit access. This issue has been fixed in 6.0.0. If an update is not possible, a workaround involves including the fixed code from pypdf.filters.decompress into the existing filters file.

CVSS 4.0 · 6.6 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-48735

pypdf: Manipulated XMP metadata streams can exhaust RAM

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.1, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing large XMP metadata, possibly with lots of unnecessary elements. This vulnerability is fixed in 6.12.1.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-33123

pypdf has inefficient decoding of array-based streams

pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-28351

Manipulated RunLengthDecode streams can exhaust RAM

pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-59938

pypdf: Possible large memory usage for wrong image dimensions

pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with declared image size values that are much too large compared to the actual data, causing large memory usage in pypdf image parsing. This issue is fixed in version 6.14.0.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-48155

pypdf: Possible large memory usage for large offsets for layout mode text

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires extracting text in layout mode with large character offsets. This vulnerability is fixed in 6.12.0.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-27026

pypdf possibly has long runtimes for malformed FlateDecode streams

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-49460

pypdf: Inefficient decoding of FlateDecode PNG predictor streams

pypdf is a free and open-source pure-python PDF library. Prior to 6.12.2, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /FlateDecode filter with a PNG predictor. This vulnerability is fixed in 6.12.2.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-31826

pypdf: manipulated stream length values can exhaust RAM

pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.

CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-84310

pypdf: Possible long runtimes/large memory usage when retrieving outlines

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-84311

pypdf: Possible long runtimes/large memory usage when extracting XForm objects

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-57204

pypdf: Missing stream length values ignore defined limits

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value. This issue has been fixed in version 6.13.3.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-41312

pypdf: Manipulated FlateDecode predictor parameters can exhaust RAM

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 the RAM being exhausted. This requires accessing a stream compressed using `/FlateDecode` with a `/Predictor` unequal 1 and large predictor parameters. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf

CVE-2026-102993

pypdf: Possible large memory usage when retrieving Roman page labels

pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/_page_labels.py to generate excessively large numeral strings when an application retrieves document page labels, consuming large amounts of memory and potentially making the application unavailable. This issue is fixed in version 6.17.0.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Py-pdf

Products

Pypdf