PYSEC-2026-1832 pypdf's LZWDecode streams be manipulated to exhaust RAM

Impact An attacker who uses this vulnerability can craft a PDF which leads to a memory usage of up to 1 GB per stream. This requires parsing the content stream of a page using the LZWDecode filter. This is a follow up to GHSA-jfx9-29x2-rv3j to align the default limit with the one for zlib. Patche...

PYSEC-2026-1833 pypdf possibly loops infinitely when reading DCT inline images without EOF marker

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires parsing the content stream of a page which has an inline image using the DCTDecode filter. Patches This has been fixed in pypdf==6.1.3. Workarounds If you cannot upgrade yet, consider...

PYSEC-2026-1831 pypdf can exhaust RAM via manipulated LZWDecode streams

Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream of a page using the LZWDecode filter. Patches This has been fixed in pypdf==6.1.3. Workarounds If you cannot upgrade yet, consider applying the changes from P...

PYSEC-2026-1830 PyPDF's Manipulated FlateDecode streams can exhaust RAM

Impact An attacker who uses this vulnerability 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. Patches This has been...

PYSEC-2026-1834 Possible Infinite Loop when PdfWriter(clone_from) is used with a PDF

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case when the pypdf-user manipulates an incomi...

PYSEC-2026-1836 PyPDF2 vulnerable to possible Infinite Loop when reading malformed objects

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case if the user extracted metadata from such ...

PYSEC-2026-1835 pypdf and PyPDF2 possible Infinite Loop when a comment isn't followed by a character

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop if parsecontentstream is executed. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case if the...

Linux Distros Unpatched Vulnerability : CVE-2026-57204

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

CVE-2026-57204

A flaw was found in pypdf, a pure-python PDF library. A remote attacker could exploit this vulnerability by crafting a malicious PDF file that, when parsed, leads to uncontrolled resource consumption and large memory usage. This occurs because the library sometimes ignores defined limits for stre...

CVE-2026-57204

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 MAXDECLAREDSTREAMLENGTH is sometimes ignored. This requires parsing a content stream...

DEBIAN-CVE-2026-57204

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 MAXDECLAREDSTREAMLENGTH is sometimes ignored. This requires parsing a content stream...

UBUNTU-CVE-2026-57204

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 MAXDECLAREDSTREAMLENGTH is sometimes ignored. This requires parsing a content stream...

CVE-2026-57204

CVE-2026-57204 affects the Python PDF library pypdf. Before version 6.13.3, a malicious PDF can trigger a DoS by causing excessive memory usage when parsing a content stream without a /Length value, due to MAX_DECLARED_STREAM_LENGTH being ignored. The issue is resolved in pypdf 6.13.3. The vulner...

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 MAXDECLAREDSTREAMLENGTH is sometimes ignored. This requires parsing a content stream...

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 MAXDECLAREDSTREAMLENGTH is sometimes ignored. This requires parsing a content stream...

CVE-2026-54531

A flaw was found in pypdf before 6.13.0. A crafted PDF with outlines can trigger an infinite loop when merged into a PdfWriter, causing denial of service...

CVE-2026-49460

A flaw was found in pypdf before 6.12.2. A crafted PDF that accesses a stream using the /FlateDecode filter with a PNG predictor can trigger excessively long processing times, leading to denial of service when the document is parsed...

CVE-2026-54651

A flaw was found in pypdf. An attacker can craft a malicious PDF file that, when merged with threads or articles into a writer, can lead to an an infinite loop. This vulnerability can result in a Denial of Service DoS condition, making the affected system unresponsive. Mitigation If PDF processin...

CVE-2026-54530

A flaw was found in pypdf, a pure-python PDF library. An attacker can craft a malicious PDF file that, when processed by a system extracting text in layout mode, can lead to an infinite loop. This vulnerability results in a Denial of Service DoS, making the affected system unresponsive. Mitigatio...

Astra Linux – Vulnerability in pypdf2

pypdf is a free and open-source Python-based PDF library. Prior to version 6.7.2, an attacker who exploited this vulnerability could create a PDF that would lead to an infinite loop. This required reading the file. This issue has been fixed in pypdf 6.7.2. As a workaround, one can manually apply...